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net.sf.saxon.expr.instruct
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<H2>
Package net.sf.saxon.expr.instruct
</H2>
This package provides classes for the compiled representation of the various elements
and other instructions found in an XSLT stylesheet.
<P>
<B>See:</B>
<BR>
<A HREF="#package_description"><B>Description</B></A>
<P>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Interface Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Debugger.html" title="interface in net.sf.saxon.expr.instruct">Debugger</A></B></TD>
<TD>This interface may be implemented by an external debugging tool</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DivisibleInstruction.html" title="interface in net.sf.saxon.expr.instruct">DivisibleInstruction</A></B></TD>
<TD>This interface is implemented by instructions that can be executed in streaming mode.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ITemplateCall.html" title="interface in net.sf.saxon.expr.instruct">ITemplateCall</A></B></TD>
<TD>An interface satisfied by all instructions that invoke templates: apply-templates,
call-template.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/TailCall.html" title="interface in net.sf.saxon.expr.instruct">TailCall</A></B></TD>
<TD>Interface representing a Tail Call.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/TailCallReturner.html" title="interface in net.sf.saxon.expr.instruct">TailCallReturner</A></B></TD>
<TD>This interface represents an expression that is capable of being processed leaving tail calls for the
calling instruction to deal with.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ValidatingInstruction.html" title="interface in net.sf.saxon.expr.instruct">ValidatingInstruction</A></B></TD>
<TD>Interface implemented by instructions that have validation and type attributes</TD>
</TR>
</TABLE>
<P>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Class Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/AnalyzeString.html" title="class in net.sf.saxon.expr.instruct">AnalyzeString</A></B></TD>
<TD>An xsl:analyze-string element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ApplyImports.html" title="class in net.sf.saxon.expr.instruct">ApplyImports</A></B></TD>
<TD>An xsl:apply-imports element in the stylesheet</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ApplyTemplates.html" title="class in net.sf.saxon.expr.instruct">ApplyTemplates</A></B></TD>
<TD>An instruction representing an xsl:apply-templates element in the stylesheet</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/AttributeCreator.html" title="class in net.sf.saxon.expr.instruct">AttributeCreator</A></B></TD>
<TD>Abstract class for fixed and computed attribute constructor expressions</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/AttributeSet.html" title="class in net.sf.saxon.expr.instruct">AttributeSet</A></B></TD>
<TD>The compiled form of an xsl:attribute-set element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Bindery.html" title="class in net.sf.saxon.expr.instruct">Bindery</A></B></TD>
<TD>The Bindery class holds information about variables and their values.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Block.html" title="class in net.sf.saxon.expr.instruct">Block</A></B></TD>
<TD>An expression that delivers the concatenation of the results of its subexpressions.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/BlockIterator.html" title="class in net.sf.saxon.expr.instruct">BlockIterator</A></B></TD>
<TD>Iterate over the instructions in the Block, concatenating the result of each instruction
into a single combined sequence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/CallTemplate.html" title="class in net.sf.saxon.expr.instruct">CallTemplate</A></B></TD>
<TD>Instruction representing an xsl:call-template element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/CallTemplate.CallTemplatePackage.html" title="class in net.sf.saxon.expr.instruct">CallTemplate.CallTemplatePackage</A></B></TD>
<TD>A CallTemplatePackage is an object that encapsulates the name of a template to be called,
the parameters to be supplied, and the execution context.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Choose.html" title="class in net.sf.saxon.expr.instruct">Choose</A></B></TD>
<TD>Compiled representation of an xsl:choose or xsl:if element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Comment.html" title="class in net.sf.saxon.expr.instruct">Comment</A></B></TD>
<TD>An instruction representing an xsl:comment element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ComputedAttribute.html" title="class in net.sf.saxon.expr.instruct">ComputedAttribute</A></B></TD>
<TD>An instruction derived from an xsl:attribute element in stylesheet, or from
an attribute constructor in XQuery, in cases where the attribute name is not known
statically</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ComputedElement.html" title="class in net.sf.saxon.expr.instruct">ComputedElement</A></B></TD>
<TD>An instruction representing an xsl:element element in an XSLT stylesheet,
or a computed element constructor in XQuery.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Copy.html" title="class in net.sf.saxon.expr.instruct">Copy</A></B></TD>
<TD>Handler for xsl:copy elements in stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/CopyOf.html" title="class in net.sf.saxon.expr.instruct">CopyOf</A></B></TD>
<TD>An xsl:copy-of element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Doctype.html" title="class in net.sf.saxon.expr.instruct">Doctype</A></B></TD>
<TD>A saxon:doctype element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DocumentInstr.html" title="class in net.sf.saxon.expr.instruct">DocumentInstr</A></B></TD>
<TD>An instruction to create a document node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/DummyNamespaceResolver.html" title="class in net.sf.saxon.expr.instruct">DummyNamespaceResolver</A></B></TD>
<TD>A dummy namespace resolver used when validating QName-valued attributes written to
the result tree.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ElementCreator.html" title="class in net.sf.saxon.expr.instruct">ElementCreator</A></B></TD>
<TD>An instruction that creates an element node.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Executable.html" title="class in net.sf.saxon.expr.instruct">Executable</A></B></TD>
<TD>A compiled stylesheet or a query in executable form.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/FixedAttribute.html" title="class in net.sf.saxon.expr.instruct">FixedAttribute</A></B></TD>
<TD>An instruction derived from an xsl:attribute element in stylesheet, or from
an attribute constructor in XQuery.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/FixedElement.html" title="class in net.sf.saxon.expr.instruct">FixedElement</A></B></TD>
<TD>An instruction that creates an element node whose name is known statically.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ForEach.html" title="class in net.sf.saxon.expr.instruct">ForEach</A></B></TD>
<TD>Handler for xsl:for-each elements in a stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ForEachGroup.html" title="class in net.sf.saxon.expr.instruct">ForEachGroup</A></B></TD>
<TD>Handler for xsl:for-each-group elements in stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/GeneralVariable.html" title="class in net.sf.saxon.expr.instruct">GeneralVariable</A></B></TD>
<TD>This class defines common behaviour across xsl:variable, xsl:param, and xsl:with-param;
also saxon:assign</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/GlobalParam.html" title="class in net.sf.saxon.expr.instruct">GlobalParam</A></B></TD>
<TD>The compiled form of a global xsl:param element in an XSLT stylesheet or an
external variable declared in the prolog of a Query.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/GlobalParameterSet.html" title="class in net.sf.saxon.expr.instruct">GlobalParameterSet</A></B></TD>
<TD>A GlobalParameterSet is a set of parameters supplied when invoking a stylesheet or query.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/GlobalVariable.html" title="class in net.sf.saxon.expr.instruct">GlobalVariable</A></B></TD>
<TD>A compiled global variable in a stylesheet or query.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Instruction.html" title="class in net.sf.saxon.expr.instruct">Instruction</A></B></TD>
<TD>Abstract superclass for all instructions in the compiled stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/InstructionDetails.html" title="class in net.sf.saxon.expr.instruct">InstructionDetails</A></B></TD>
<TD>Details about an instruction, used when reporting errors and when tracing</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/LocalParam.html" title="class in net.sf.saxon.expr.instruct">LocalParam</A></B></TD>
<TD>The compiled form of an xsl:param element within a template in an XSLT stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/LocalParamBlock.html" title="class in net.sf.saxon.expr.instruct">LocalParamBlock</A></B></TD>
<TD>Represents the set of xsl:param elements at the start of an xsl:iterate instruction</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/LocalParamSetter.html" title="class in net.sf.saxon.expr.instruct">LocalParamSetter</A></B></TD>
<TD>The compiled form of an xsl:param element within a template in an XSLT stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/LocalVariable.html" title="class in net.sf.saxon.expr.instruct">LocalVariable</A></B></TD>
<TD>Handler for local xsl:variable elements in stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/LocationMap.html" title="class in net.sf.saxon.expr.instruct">LocationMap</A></B></TD>
<TD>A LocationMap allocates integer codes to (systemId, lineNumber) pairs.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Message.html" title="class in net.sf.saxon.expr.instruct">Message</A></B></TD>
<TD>An xsl:message element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/NamespaceConstructor.html" title="class in net.sf.saxon.expr.instruct">NamespaceConstructor</A></B></TD>
<TD>A namespace constructor instruction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/NextMatch.html" title="class in net.sf.saxon.expr.instruct">NextMatch</A></B></TD>
<TD>An xsl:next-match element in the stylesheet</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/NumberInstruction.html" title="class in net.sf.saxon.expr.instruct">NumberInstruction</A></B></TD>
<TD>An xsl:number element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ParameterSet.html" title="class in net.sf.saxon.expr.instruct">ParameterSet</A></B></TD>
<TD>A ParameterSet is a set of parameters supplied when calling a template.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ParentNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">ParentNodeConstructor</A></B></TD>
<TD>An abstract class to act as a common parent for instructions that create element nodes
and document nodes.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Procedure.html" title="class in net.sf.saxon.expr.instruct">Procedure</A></B></TD>
<TD>This object represents the compiled form of a user-written function, template, attribute-set, etc
(the source can be either an XSLT stylesheet function or an XQuery function).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ProcessingInstruction.html" title="class in net.sf.saxon.expr.instruct">ProcessingInstruction</A></B></TD>
<TD>An xsl:processing-instruction element in the stylesheet, or a processing-instruction
constructor in a query</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ProcessRegexMatchInstruction.html" title="class in net.sf.saxon.expr.instruct">ProcessRegexMatchInstruction</A></B></TD>
<TD>An internal instruction used by the fn:analyze-string function to process a matching
substring.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ResultDocument.html" title="class in net.sf.saxon.expr.instruct">ResultDocument</A></B></TD>
<TD>The compiled form of an xsl:result-document element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SavedNamespaceContext.html" title="class in net.sf.saxon.expr.instruct">SavedNamespaceContext</A></B></TD>
<TD>An object representing a list of Namespaces.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SimpleNodeConstructor.html" title="class in net.sf.saxon.expr.instruct">SimpleNodeConstructor</A></B></TD>
<TD>Common superclass for XSLT instructions whose content template produces a text
value: xsl:attribute, xsl:comment, xsl:processing-instruction, xsl:namespace,
and xsl:text, and their XQuery equivalents</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/SlotManager.html" title="class in net.sf.saxon.expr.instruct">SlotManager</A></B></TD>
<TD>A SlotManager supports functions, templates, etc: specifically, any executable code that
requires a stack frame containing local variables.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/Template.html" title="class in net.sf.saxon.expr.instruct">Template</A></B></TD>
<TD>The runtime object corresponding to an xsl:template element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/TraceExpression.html" title="class in net.sf.saxon.expr.instruct">TraceExpression</A></B></TD>
<TD>A wrapper expression used to trace expressions in XPath and XQuery.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/UseAttributeSets.html" title="class in net.sf.saxon.expr.instruct">UseAttributeSets</A></B></TD>
<TD>This instruction corresponds to a use-attribute-sets attribute on a literal result element, xsl:element,
or xsl:copy.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/UserFunction.html" title="class in net.sf.saxon.expr.instruct">UserFunction</A></B></TD>
<TD>This object represents the compiled form of a user-written function
(the source can be either an XSLT stylesheet function or an XQuery function).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/UserFunctionParameter.html" title="class in net.sf.saxon.expr.instruct">UserFunctionParameter</A></B></TD>
<TD>Run-time object representing a formal argument to a user-defined function</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/ValueOf.html" title="class in net.sf.saxon.expr.instruct">ValueOf</A></B></TD>
<TD>An xsl:value-of element in the stylesheet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/WithParam.html" title="class in net.sf.saxon.expr.instruct">WithParam</A></B></TD>
<TD>An object derived from a xsl:with-param element in the stylesheet.</TD>
</TR>
</TABLE>
<P>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Exception Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../../../../net/sf/saxon/expr/instruct/TerminationException.html" title="class in net.sf.saxon.expr.instruct">TerminationException</A></B></TD>
<TD>An exception thrown by xsl:message terminate="yes".</TD>
</TR>
</TABLE>
<P>
<A NAME="package_description"><!-- --></A><H2>
Package net.sf.saxon.expr.instruct Description
</H2>
<P>
<p>This package provides classes for the compiled representation of the various elements
and other instructions found in an XSLT stylesheet. The same constructs are also used for
evaluating similar constructs in XQuery, in particular, expressions that construct new nodes.</p>
<p>Instances of these classes are constructed when the stylesheet or query is compiled. In the
case of XSLT, the objects
representing the compile-time stylesheet (in package net.sf.saxon.style) can then be
discarded and garbage-collected.</p>
<p>The most important class is <code>Instruction</code>, which represents an XSLT Instruction. In most cases
these instructions have a one-to-one relationship with instructions in the original source XSLT
stylesheet, and the names of the subclasses (for example ApplyImports, ApplyTemplates, Choose)
reflect this.</p>
<p>In XSLT 1.0, XSLT instructions and XPath expressions were quite distinct, and were evaluated in different
ways: XSLT instructions in "push" mode (they were described as "writing to the result tree"), and XPath expressions
in "pull" mode (reading from the source tree). This distinction is no longer present in the XSLT 2.0 processing
model, and the boundary between the <code>Instruction</code> and <code>Expression</code> classes is therefore
a rather fuzzy one. Both instructions and expressions can now be evaluated in either push or pull mode.
Flow-of-control constructs such as conditional expressions and FOR expressions are evaluated in either mode
depending on their parent expression.</p>
<hr>
<p align="center"><i>Michael H. Kay<br/>
Saxonica Limited<br/>
28 November 2011</i></p>
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