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saxon-manual-9.4.0.9-2.mga7.noarch.rpm

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DocumentInstr
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net.sf.saxon.expr.instruct</FONT>
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Class DocumentInstr</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">net.sf.saxon.expr.Expression</A>
      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">net.sf.saxon.expr.instruct.Instruction</A>
          <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">net.sf.saxon.expr.instruct.ParentNodeConstructor</A>
              <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>net.sf.saxon.expr.instruct.DocumentInstr</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true" title="class or interface in javax.xml.transform">SourceLocator</A>, <A HREF="../../../../../net/sf/saxon/event/LocationProvider.html" title="interface in net.sf.saxon.event">LocationProvider</A>, <A HREF="../../../../../net/sf/saxon/event/SaxonLocator.html" title="interface in net.sf.saxon.event">SaxonLocator</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/DivisibleInstruction.html" title="interface in net.sf.saxon.expr.instruct">DivisibleInstruction</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/TailCallReturner.html" title="interface in net.sf.saxon.expr.instruct">TailCallReturner</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ValidatingInstruction.html" title="interface in net.sf.saxon.expr.instruct">ValidatingInstruction</A>, <A HREF="../../../../../net/sf/saxon/trace/InstructionInfo.html" title="interface in net.sf.saxon.trace">InstructionInfo</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/org/xml/sax/Locator.html?is-external=true" title="class or interface in org.xml.sax">Locator</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>DocumentInstr</B><DT>extends <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">ParentNodeConstructor</A></DL>
</PRE>

<P>
An instruction to create a document node. This corresponds to the xsl:document-node
 instruction in XSLT. It is also used to support the document node constructor
 expression in XQuery, and is generated implicitly within an xsl:variable
 that constructs a temporary tree.

 <p>Conceptually it represents an XSLT instruction xsl:document-node,
 with no attributes, whose content is a complex content constructor for the
 children of the document node.</p>
<P>

<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html#net.sf.saxon.expr.instruct.DocumentInstr">Serialized Form</A></DL>
<HR>

<P>
<!-- =========== FIELD SUMMARY =========== -->

<A NAME="field_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Field Summary</B></FONT></TH>
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&nbsp;<A NAME="fields_inherited_from_class_net.sf.saxon.expr.instruct.ParentNodeConstructor"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Fields inherited from class net.sf.saxon.expr.instruct.<A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">ParentNodeConstructor</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#content">content</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#preservingTypes">preservingTypes</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="fields_inherited_from_class_net.sf.saxon.expr.Expression"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Fields inherited from class net.sf.saxon.expr.<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html#EFFECTIVE_BOOLEAN_VALUE">EFFECTIVE_BOOLEAN_VALUE</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#EVALUATE_METHOD">EVALUATE_METHOD</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#EVENT_FEED_METHOD">EVENT_FEED_METHOD</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#ITEM_FEED_METHOD">ITEM_FEED_METHOD</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#ITERATE_METHOD">ITERATE_METHOD</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#locationId">locationId</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#MAX_SEQUENCE_LENGTH">MAX_SEQUENCE_LENGTH</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#MAX_STRING_LENGTH">MAX_STRING_LENGTH</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#PROCESS_METHOD">PROCESS_METHOD</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#PUSH_SELECTION">PUSH_SELECTION</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#staticProperties">staticProperties</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#UNBOUNDED_LOWER">UNBOUNDED_LOWER</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#UNBOUNDED_UPPER">UNBOUNDED_UPPER</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#WATCH_METHOD">WATCH_METHOD</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<!-- ======== CONSTRUCTOR SUMMARY ======== -->

<A NAME="constructor_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Constructor Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#DocumentInstr(boolean, java.lang.String, java.lang.String)">DocumentInstr</A></B>(boolean&nbsp;textOnly,
              <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;constantText,
              <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;baseURI)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a document constructor instruction</TD>
</TR>
</TABLE>
&nbsp;
<!-- ========== METHOD SUMMARY =========== -->

<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#checkContentSequence(net.sf.saxon.expr.StaticContext)">checkContentSequence</A></B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A>&nbsp;env)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check statically that the sequence of child instructions doesn't violate any obvious constraints
 on the content of the node</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#checkContentSequence(net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.Expression, int, net.sf.saxon.type.SchemaType)">checkContentSequence</A></B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A>&nbsp;env,
                     <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;content,
                     int&nbsp;validation,
                     <A HREF="../../../../../net/sf/saxon/type/SchemaType.html" title="interface in net.sf.saxon.type">SchemaType</A>&nbsp;type)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#computeSpecialProperties()">computeSpecialProperties</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the static properties of this expression (other than its type).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#copy()">copy</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Copy an expression.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#evaluateItem(net.sf.saxon.expr.XPathContext)">evaluateItem</A></B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluate as an item.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#explain(net.sf.saxon.trace.ExpressionPresenter)">explain</A></B>(<A HREF="../../../../../net/sf/saxon/trace/ExpressionPresenter.html" title="class in net.sf.saxon.trace">ExpressionPresenter</A>&nbsp;out)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Diagnostic print of expression structure.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#getConstantText()">getConstantText</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For a text-only instruction, determine if the text value is fixed and if so return it;
 otherwise return null</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#getImplementationMethod()">getImplementationMethod</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#getInstructionNameCode()">getInstructionNameCode</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the name of this instruction for diagnostic and tracing purposes
 (the string "document-constructor")</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/type/ItemType.html" title="interface in net.sf.saxon.type">ItemType</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#getItemType(net.sf.saxon.type.TypeHierarchy)">getItemType</A></B>(<A HREF="../../../../../net/sf/saxon/type/TypeHierarchy.html" title="class in net.sf.saxon.type">TypeHierarchy</A>&nbsp;th)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the item type</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#getStringValueExpression()">getStringValueExpression</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In the case of a text-only instruction (xsl:variable containing a text node or one or more xsl:value-of
 instructions), return an expression that evaluates to the textual content as an instance of xs:untypedAtomic</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#isTextOnly()">isTextOnly</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Determine whether this is a "text only" document: essentially, an XSLT xsl:variable that contains
 a single text node or xsl:value-of instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#iterateEvents(net.sf.saxon.expr.XPathContext)">iterateEvents</A></B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deliver the result of the expression as a sequence of events.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/expr/instruct/TailCall.html" title="interface in net.sf.saxon.expr.instruct">TailCall</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#processLeavingTail(net.sf.saxon.expr.XPathContext)">processLeavingTail</A></B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&nbsp;context)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ProcessLeavingTail: called to do the real work of this instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#processLeft(java.util.Stack, java.util.Stack)">processLeft</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&gt;&nbsp;contextStack,
            <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>&gt;&nbsp;state)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In streaming mode, process the first half of the instruction (to start a new document or element)</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#processRight(java.util.Stack, java.util.Stack)">processRight</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&gt;&nbsp;contextStack,
             <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>&gt;&nbsp;state)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In streaming mode, proecss the right half of the instruction (to end a new document or element)</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html#simplify(net.sf.saxon.expr.parser.ExpressionVisitor)">simplify</A></B>(<A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor</A>&nbsp;visitor)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Simplify an expression.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_net.sf.saxon.expr.instruct.ParentNodeConstructor"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class net.sf.saxon.expr.instruct.<A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">ParentNodeConstructor</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#addToPathMap(net.sf.saxon.expr.parser.PathMap, net.sf.saxon.expr.parser.PathMap.PathMapNodeSet)">addToPathMap</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#computeCardinality()">computeCardinality</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#createsNewNodes()">createsNewNodes</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#getBaseURI()">getBaseURI</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#getCardinality()">getCardinality</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#getContentExpression()">getContentExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#getSchemaType()">getSchemaType</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#getValidationAction()">getValidationAction</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#isLazyConstruction()">isLazyConstruction</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#isNamespaceSensitive()">isNamespaceSensitive</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#isPreservingTypes()">isPreservingTypes</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#iterateSubExpressions()">iterateSubExpressions</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#optimize(net.sf.saxon.expr.parser.ExpressionVisitor, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)">optimize</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#promoteInst(net.sf.saxon.expr.parser.PromotionOffer)">promoteInst</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#replaceSubExpression(net.sf.saxon.expr.Expression, net.sf.saxon.expr.Expression)">replaceSubExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#setBaseURI(java.lang.String)">setBaseURI</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#setContentExpression(net.sf.saxon.expr.Expression)">setContentExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#setLazyConstruction(boolean)">setLazyConstruction</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#setNoNeedToStrip()">setNoNeedToStrip</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#setSchemaType(net.sf.saxon.type.SchemaType)">setSchemaType</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#setValidationAction(int, net.sf.saxon.type.SchemaType)">setValidationAction</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#typeCheck(net.sf.saxon.expr.parser.ExpressionVisitor, net.sf.saxon.expr.parser.ExpressionVisitor.ContextItemType)">typeCheck</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_net.sf.saxon.expr.instruct.Instruction"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class net.sf.saxon.expr.instruct.<A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#assembleParams(net.sf.saxon.expr.XPathContext, net.sf.saxon.expr.instruct.WithParam[])">assembleParams</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#assembleTunnelParams(net.sf.saxon.expr.XPathContext, net.sf.saxon.expr.instruct.WithParam[])">assembleTunnelParams</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#dynamicError(javax.xml.transform.SourceLocator, net.sf.saxon.trans.XPathException, net.sf.saxon.expr.XPathContext)">dynamicError</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#evaluateAsString(net.sf.saxon.expr.XPathContext)">evaluateAsString</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getConstructType()">getConstructType</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getExpressionName()">getExpressionName</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getInstructionName()">getInstructionName</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getIteratorFromProcessMethod(net.sf.saxon.expr.XPathContext)">getIteratorFromProcessMethod</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getSourceLocator()">getSourceLocator</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#isXSLT()">isXSLT</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#iterate(net.sf.saxon.expr.XPathContext)">iterate</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#process(net.sf.saxon.expr.XPathContext)">process</A>, <A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#promote(net.sf.saxon.expr.parser.PromotionOffer, net.sf.saxon.expr.Expression)">promote</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_net.sf.saxon.expr.Expression"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class net.sf.saxon.expr.<A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html#adoptChildExpression(net.sf.saxon.expr.Expression)">adoptChildExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#checkForUpdatingSubexpressions()">checkForUpdatingSubexpressions</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#checkPermittedContents(net.sf.saxon.type.SchemaType, net.sf.saxon.expr.StaticContext, boolean)">checkPermittedContents</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#computeDependencies()">computeDependencies</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#computeStaticProperties()">computeStaticProperties</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#doPromotion(net.sf.saxon.expr.Expression, net.sf.saxon.expr.parser.PromotionOffer)">doPromotion</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#dynamicError(java.lang.String, java.lang.String, net.sf.saxon.expr.XPathContext)">dynamicError</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#effectiveBooleanValue(net.sf.saxon.expr.XPathContext)">effectiveBooleanValue</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#evaluatePendingUpdates(net.sf.saxon.expr.XPathContext, net.sf.saxon.expr.PendingUpdateList)">evaluatePendingUpdates</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#explain(java.io.OutputStream)">explain</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getColumnNumber()">getColumnNumber</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getColumnNumber(long)">getColumnNumber</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getContainer()">getContainer</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getDependencies()">getDependencies</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getEvaluationMethod()">getEvaluationMethod</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getExecutable()">getExecutable</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getHostLanguage()">getHostLanguage</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getIntegerBounds()">getIntegerBounds</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getIntrinsicDependencies()">getIntrinsicDependencies</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getLineNumber()">getLineNumber</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getLineNumber(long)">getLineNumber</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getLocationId()">getLocationId</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getLocationProvider()">getLocationProvider</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getObjectName()">getObjectName</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getProperties()">getProperties</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getProperty(java.lang.String)">getProperty</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getPublicId()">getPublicId</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getSlotsUsed()">getSlotsUsed</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getSpecialProperties()">getSpecialProperties</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getSystemId()">getSystemId</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#getSystemId(long)">getSystemId</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#hasLoopingSubexpression(net.sf.saxon.expr.Expression)">hasLoopingSubexpression</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#hasVariableBinding(net.sf.saxon.expr.Binding)">hasVariableBinding</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#implementsStaticTypeCheck()">implementsStaticTypeCheck</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#isSubtreeExpression()">isSubtreeExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#isUpdatingExpression()">isUpdatingExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#isVacuousExpression()">isVacuousExpression</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#iterateSameFocusSubExpressions()">iterateSameFocusSubExpressions</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#markTailFunctionCalls(net.sf.saxon.om.StructuredQName, int)">markTailFunctionCalls</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#resetLocalStaticProperties()">resetLocalStaticProperties</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#setContainer(net.sf.saxon.expr.Container)">setContainer</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#setEvaluationMethod(int)">setEvaluationMethod</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#setFiltered(boolean)">setFiltered</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#setFlattened(boolean)">setFlattened</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#setLocationId(int)">setLocationId</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#staticTypeCheck(net.sf.saxon.value.SequenceType, boolean, net.sf.saxon.expr.parser.RoleLocator, net.sf.saxon.TypeCheckerEnvironment)">staticTypeCheck</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#suppressValidation(int)">suppressValidation</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#toString()">toString</A>, <A HREF="../../../../../net/sf/saxon/expr/Expression.html#typeError(java.lang.String, java.lang.String, net.sf.saxon.expr.XPathContext)">typeError</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_javax.xml.transform.SourceLocator"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from interface javax.xml.transform.<A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true" title="class or interface in javax.xml.transform">SourceLocator</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true#getColumnNumber()" title="class or interface in javax.xml.transform">getColumnNumber</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true#getLineNumber()" title="class or interface in javax.xml.transform">getLineNumber</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true#getPublicId()" title="class or interface in javax.xml.transform">getPublicId</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/SourceLocator.html?is-external=true#getSystemId()" title="class or interface in javax.xml.transform">getSystemId</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="DocumentInstr(boolean, java.lang.String, java.lang.String)"><!-- --></A><H3>
DocumentInstr</H3>
<PRE>
public <B>DocumentInstr</B>(boolean&nbsp;textOnly,
                     <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;constantText,
                     <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;baseURI)</PRE>
<DL>
<DD>Create a document constructor instruction
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>textOnly</CODE> - true if the content contains text nodes only<DD><CODE>constantText</CODE> - if the content contains text nodes only and the text is known at compile time,
        supplies the textual content<DD><CODE>baseURI</CODE> - the base URI of the instruction</DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="getImplementationMethod()"><!-- --></A><H3>
getImplementationMethod</H3>
<PRE>
public int <B>getImplementationMethod</B>()</PRE>
<DL>
<DD>An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
 This method indicates which of these methods is prefered. For instructions this is the process() method.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getImplementationMethod()">getImplementationMethod</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the implementation method, for example <A HREF="../../../../../net/sf/saxon/expr/Expression.html#ITERATE_METHOD"><CODE>Expression.ITERATE_METHOD</CODE></A> or <A HREF="../../../../../net/sf/saxon/expr/Expression.html#EVALUATE_METHOD"><CODE>Expression.EVALUATE_METHOD</CODE></A> or
 <A HREF="../../../../../net/sf/saxon/expr/Expression.html#PROCESS_METHOD"><CODE>Expression.PROCESS_METHOD</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="isTextOnly()"><!-- --></A><H3>
isTextOnly</H3>
<PRE>
public boolean <B>isTextOnly</B>()</PRE>
<DL>
<DD>Determine whether this is a "text only" document: essentially, an XSLT xsl:variable that contains
 a single text node or xsl:value-of instruction.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>true if this is a text-only document</DL>
</DD>
</DL>
<HR>

<A NAME="getConstantText()"><!-- --></A><H3>
getConstantText</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</A> <B>getConstantText</B>()</PRE>
<DL>
<DD>For a text-only instruction, determine if the text value is fixed and if so return it;
 otherwise return null
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the fixed text value if appropriate; otherwise null</DL>
</DD>
</DL>
<HR>

<A NAME="simplify(net.sf.saxon.expr.parser.ExpressionVisitor)"><!-- --></A><H3>
simplify</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>simplify</B>(<A HREF="../../../../../net/sf/saxon/expr/parser/ExpressionVisitor.html" title="class in net.sf.saxon.expr.parser">ExpressionVisitor</A>&nbsp;visitor)
                    throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Simplify an expression. This performs any static optimization (by rewriting the expression
 as a different expression). The default implementation does nothing.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#simplify(net.sf.saxon.expr.parser.ExpressionVisitor)">simplify</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">ParentNodeConstructor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>visitor</CODE> - an expression visitor
<DT><B>Returns:</B><DD>the simplified expression
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if an error is discovered during expression rewriting</DL>
</DD>
</DL>
<HR>

<A NAME="checkContentSequence(net.sf.saxon.expr.StaticContext)"><!-- --></A><H3>
checkContentSequence</H3>
<PRE>
protected void <B>checkContentSequence</B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A>&nbsp;env)
                             throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Check statically that the sequence of child instructions doesn't violate any obvious constraints
 on the content of the node
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html#checkContentSequence(net.sf.saxon.expr.StaticContext)">checkContentSequence</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">ParentNodeConstructor</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - the static context
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="checkContentSequence(net.sf.saxon.expr.StaticContext, net.sf.saxon.expr.Expression, int, net.sf.saxon.type.SchemaType)"><!-- --></A><H3>
checkContentSequence</H3>
<PRE>
protected static void <B>checkContentSequence</B>(<A HREF="../../../../../net/sf/saxon/expr/StaticContext.html" title="interface in net.sf.saxon.expr">StaticContext</A>&nbsp;env,
                                           <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A>&nbsp;content,
                                           int&nbsp;validation,
                                           <A HREF="../../../../../net/sf/saxon/type/SchemaType.html" title="interface in net.sf.saxon.type">SchemaType</A>&nbsp;type)
                                    throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="computeSpecialProperties()"><!-- --></A><H3>
computeSpecialProperties</H3>
<PRE>
public int <B>computeSpecialProperties</B>()</PRE>
<DL>
<DD>Get the static properties of this expression (other than its type). The result is
 bit-signficant. These properties are used for optimizations. In general, if
 property bit is set, it is true, but if it is unset, the value is unknown.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#computeSpecialProperties()">computeSpecialProperties</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a set of flags indicating static properties of this expression</DL>
</DD>
</DL>
<HR>

<A NAME="getStringValueExpression()"><!-- --></A><H3>
getStringValueExpression</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>getStringValueExpression</B>()</PRE>
<DL>
<DD>In the case of a text-only instruction (xsl:variable containing a text node or one or more xsl:value-of
 instructions), return an expression that evaluates to the textual content as an instance of xs:untypedAtomic
<P>
<DD><DL>

<DT><B>Returns:</B><DD>an expression that evaluates to the textual content</DL>
</DD>
</DL>
<HR>

<A NAME="copy()"><!-- --></A><H3>
copy</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A> <B>copy</B>()</PRE>
<DL>
<DD>Copy an expression. This makes a deep copy.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html#copy()">copy</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the copy of the original expression</DL>
</DD>
</DL>
<HR>

<A NAME="getItemType(net.sf.saxon.type.TypeHierarchy)"><!-- --></A><H3>
getItemType</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/type/ItemType.html" title="interface in net.sf.saxon.type">ItemType</A> <B>getItemType</B>(<A HREF="../../../../../net/sf/saxon/type/TypeHierarchy.html" title="class in net.sf.saxon.type">TypeHierarchy</A>&nbsp;th)</PRE>
<DL>
<DD>Get the item type
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getItemType(net.sf.saxon.type.TypeHierarchy)">getItemType</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>th</CODE> - The TypeHierarchy
<DT><B>Returns:</B><DD>the in</DL>
</DD>
</DL>
<HR>

<A NAME="processLeavingTail(net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
processLeavingTail</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/expr/instruct/TailCall.html" title="interface in net.sf.saxon.expr.instruct">TailCall</A> <B>processLeavingTail</B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&nbsp;context)
                            throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#processLeavingTail(net.sf.saxon.expr.XPathContext)">Instruction</A></CODE></B></DD>
<DD>ProcessLeavingTail: called to do the real work of this instruction. This method
 must be implemented in each subclass. The results of the instruction are written
 to the current Receiver, which can be obtained via the Controller.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/TailCallReturner.html#processLeavingTail(net.sf.saxon.expr.XPathContext)">processLeavingTail</A></CODE> in interface <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/TailCallReturner.html" title="interface in net.sf.saxon.expr.instruct">TailCallReturner</A></CODE><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#processLeavingTail(net.sf.saxon.expr.XPathContext)">processLeavingTail</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The dynamic context of the transformation, giving access to the current node,
 the current variables, etc.
<DT><B>Returns:</B><DD>null if the instruction has completed execution; or a TailCall indicating
 a function call or template call that is delegated to the caller, to be made after the stack has
 been unwound so as to save stack space.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a dynamic error occurs during the evaluation
 of the instruction</DL>
</DD>
</DL>
<HR>

<A NAME="processLeft(java.util.Stack, java.util.Stack)"><!-- --></A><H3>
processLeft</H3>
<PRE>
public void <B>processLeft</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&gt;&nbsp;contextStack,
                        <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>&gt;&nbsp;state)
                 throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>In streaming mode, process the first half of the instruction (to start a new document or element)
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>contextStack</CODE> - the dynamic evaluation context<DD><CODE>state</CODE> - a stack on which the instruction can save state information for use during the corresponding
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a dynamic error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="processRight(java.util.Stack, java.util.Stack)"><!-- --></A><H3>
processRight</H3>
<PRE>
public void <B>processRight</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&gt;&nbsp;contextStack,
                         <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A>&lt;<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>&gt;&nbsp;state)
                  throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>In streaming mode, proecss the right half of the instruction (to end a new document or element)
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>contextStack</CODE> - the dynamic evaluation context<DD><CODE>state</CODE> - a stack on which the instruction can save state information for use during the corresponding
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a dynamic error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="evaluateItem(net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
evaluateItem</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> <B>evaluateItem</B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&nbsp;context)
                  throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Evaluate as an item.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#evaluateItem(net.sf.saxon.expr.XPathContext)">evaluateItem</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The context in which the expression is to be evaluated
<DT><B>Returns:</B><DD>the node or atomic value that results from evaluating the
     expression; or null to indicate that the result is an empty
     sequence
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if any dynamic error occurs evaluating the
     expression</DL>
</DD>
</DL>
<HR>

<A NAME="iterateEvents(net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
iterateEvents</H3>
<PRE>
public <A HREF="../../../../../net/sf/saxon/evpull/EventIterator.html" title="interface in net.sf.saxon.evpull">EventIterator</A> <B>iterateEvents</B>(<A HREF="../../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A>&nbsp;context)
                            throws <A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html#iterateEvents(net.sf.saxon.expr.XPathContext)">Expression</A></CODE></B></DD>
<DD>Deliver the result of the expression as a sequence of events.

 <p>The events (of class <A HREF="../../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull"><CODE>PullEvent</CODE></A>) are either complete
 items, or one of startElement, endElement, startDocument, or endDocument, known
 as semi-nodes. The stream of events may also include a nested EventIterator.
 If a start-end pair exists in the sequence, then the events between
 this pair represent the content of the document or element. The content sequence will
 have been processed to the extent that any attribute and namespace nodes in the
 content sequence will have been merged into the startElement event. Namespace fixup
 will have been performed: that is, unique prefixes will have been allocated to element
 and attribute nodes, and all namespaces will be declared by means of a namespace node
 in the startElement event or in an outer startElement forming part of the sequence.
 However, duplicate namespaces may appear in the sequence.</p>
 <p>The content of an element or document may include adjacent or zero-length text nodes,
 atomic values, and nodes represented as nodes rather than broken down into events.</p>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html#iterateEvents(net.sf.saxon.expr.XPathContext)">iterateEvents</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The dynamic evaluation context
<DT><B>Returns:</B><DD>the result of the expression as an iterator over a sequence of PullEvent objects
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if a dynamic error occurs during expression evaluation</DL>
</DD>
</DL>
<HR>

<A NAME="getInstructionNameCode()"><!-- --></A><H3>
getInstructionNameCode</H3>
<PRE>
public int <B>getInstructionNameCode</B>()</PRE>
<DL>
<DD>Get the name of this instruction for diagnostic and tracing purposes
 (the string "document-constructor")
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html#getInstructionNameCode()">getInstructionNameCode</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a code identifying the instruction: typically but not always
 the fingerprint of a name in the XSLT namespace</DL>
</DD>
</DL>
<HR>

<A NAME="explain(net.sf.saxon.trace.ExpressionPresenter)"><!-- --></A><H3>
explain</H3>
<PRE>
public void <B>explain</B>(<A HREF="../../../../../net/sf/saxon/trace/ExpressionPresenter.html" title="class in net.sf.saxon.trace">ExpressionPresenter</A>&nbsp;out)</PRE>
<DL>
<DD>Diagnostic print of expression structure. The abstract expression tree
 is written to the supplied output destination.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html#explain(net.sf.saxon.trace.ExpressionPresenter)">explain</A></CODE> in class <CODE><A HREF="../../../../../net/sf/saxon/expr/Expression.html" title="class in net.sf.saxon.expr">Expression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>out</CODE> - the expression presenter used to display the structure</DL>
</DD>
</DL>
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