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ItemType
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SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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<FONT SIZE="-1">
net.sf.saxon.type</FONT>
<BR>
Interface ItemType</H2>
<DL>
<DT><B>All Superinterfaces:</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></DD>
</DL>
<DL>
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../net/sf/saxon/type/AtomicType.html" title="interface in net.sf.saxon.type">AtomicType</A>, <A HREF="../../../../net/sf/saxon/type/FunctionItemType.html" title="interface in net.sf.saxon.type">FunctionItemType</A>, <A HREF="../../../../net/sf/saxon/type/PlainType.html" title="interface in net.sf.saxon.type">PlainType</A></DD>
</DL>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../net/sf/saxon/pattern/AnyChildNodeTest.html" title="class in net.sf.saxon.pattern">AnyChildNodeTest</A>, <A HREF="../../../../net/sf/saxon/type/AnyFunctionType.html" title="class in net.sf.saxon.type">AnyFunctionType</A>, <A HREF="../../../../net/sf/saxon/type/AnyItemType.html" title="class in net.sf.saxon.type">AnyItemType</A>, <A HREF="../../../../net/sf/saxon/pattern/AnyNodeTest.html" title="class in net.sf.saxon.pattern">AnyNodeTest</A>, <A HREF="../../../../net/sf/saxon/type/BuiltInAtomicType.html" title="class in net.sf.saxon.type">BuiltInAtomicType</A>, <A HREF="../../../../net/sf/saxon/pattern/CombinedNodeTest.html" title="class in net.sf.saxon.pattern">CombinedNodeTest</A>, <A HREF="../../../../net/sf/saxon/pattern/ContentTypeTest.html" title="class in net.sf.saxon.pattern">ContentTypeTest</A>, <A HREF="../../../../net/sf/saxon/pattern/DocumentNodeTest.html" title="class in net.sf.saxon.pattern">DocumentNodeTest</A>, <A HREF="../../../../net/sf/saxon/pattern/EmptySequenceTest.html" title="class in net.sf.saxon.pattern">EmptySequenceTest</A>, <A HREF="../../../../net/sf/saxon/type/ExternalObjectType.html" title="class in net.sf.saxon.type">ExternalObjectType</A>, <A HREF="../../../../com/saxonica/functions/hof/FunctionType.html" title="class in com.saxonica.functions.hof">FunctionType</A>, <A HREF="../../../../net/sf/saxon/pattern/LocalNameTest.html" title="class in net.sf.saxon.pattern">LocalNameTest</A>, <A HREF="../../../../com/saxonica/functions/map/MapType.html" title="class in com.saxonica.functions.map">MapType</A>, <A HREF="../../../../net/sf/saxon/pattern/NamespaceTest.html" title="class in net.sf.saxon.pattern">NamespaceTest</A>, <A HREF="../../../../net/sf/saxon/pattern/NameTest.html" title="class in net.sf.saxon.pattern">NameTest</A>, <A HREF="../../../../net/sf/saxon/pattern/NodeKindTest.html" title="class in net.sf.saxon.pattern">NodeKindTest</A>, <A HREF="../../../../net/sf/saxon/pattern/NodeTest.html" title="class in net.sf.saxon.pattern">NodeTest</A>, <A HREF="../../../../com/saxonica/validate/SchemaAttributeTest.html" title="class in com.saxonica.validate">SchemaAttributeTest</A>, <A HREF="../../../../com/saxonica/validate/SchemaElementTest.html" title="class in com.saxonica.validate">SchemaElementTest</A>, <A HREF="../../../../com/saxonica/schema/UserAtomicType.html" title="class in com.saxonica.schema">UserAtomicType</A>, <A HREF="../../../../com/saxonica/schema/UserUnionType.html" title="class in com.saxonica.schema">UserUnionType</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>ItemType</B><DT>extends <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></DL>
</PRE>
<P>
ItemType is an interface that allows testing of whether an Item conforms to an
expected type. ItemType represents the types in the type hierarchy in the XPath model,
as distinct from the schema model: an item type is either item() (matches everything),
a node type (matches nodes), an atomic type (matches atomic values), or empty()
(matches nothing). Atomic types, represented by the class AtomicType, are also
instances of SimpleType in the schema type hierarchy. Node Types, represented by
the class NodeTest, are also Patterns as used in XSLT.
<p>Saxon assumes that apart from <A HREF="../../../../net/sf/saxon/type/AnyItemType.html" title="class in net.sf.saxon.type"><CODE>AnyItemType</CODE></A> (which corresponds to <code>item()</item>
and matches anything), every ItemType will be either an <A HREF="../../../../net/sf/saxon/type/AtomicType.html" title="interface in net.sf.saxon.type"><CODE>AtomicType</CODE></A>, a <A HREF="../../../../net/sf/saxon/pattern/NodeTest.html" title="class in net.sf.saxon.pattern"><CODE>NodeTest</CODE></A>,
or a <A HREF="../../../../net/sf/saxon/type/FunctionItemType.html" title="interface in net.sf.saxon.type"><CODE>FunctionItemType</CODE></A>. User-defined implementations of ItemType must therefore extend one of those
three classes/interfaces.</p>
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../net/sf/saxon/type/AtomicType.html" title="interface in net.sf.saxon.type"><CODE>AtomicType</CODE></A>,
<A HREF="../../../../net/sf/saxon/pattern/NodeTest.html" title="class in net.sf.saxon.pattern"><CODE>NodeTest</CODE></A>,
<A HREF="../../../../net/sf/saxon/type/FunctionItemType.html" title="interface in net.sf.saxon.type"><CODE>FunctionItemType</CODE></A></DL>
<HR>
<P>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/type/PlainType.html" title="interface in net.sf.saxon.type">PlainType</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#getAtomizedItemType()">getAtomizedItemType</A></B>()</CODE>
<BR>
Get the item type of the atomic values that will be produced when an item
of this type is atomized</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#getDefaultPriority()">getDefaultPriority</A></B>()</CODE>
<BR>
Determine the default priority of this item type when used on its own as a Pattern</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <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/type/ItemType.html#getPrimitiveItemType()">getPrimitiveItemType</A></B>()</CODE>
<BR>
Get the primitive item type corresponding to this item type.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#getPrimitiveType()">getPrimitiveType</A></B>()</CODE>
<BR>
Get the primitive type corresponding to this item type.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <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/type/ItemType.html#getSuperType(net.sf.saxon.type.TypeHierarchy)">getSuperType</A></B>(<A HREF="../../../../net/sf/saxon/type/TypeHierarchy.html" title="class in net.sf.saxon.type">TypeHierarchy</A> th)</CODE>
<BR>
Get the type from which this item type is derived by restriction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#isAtomicType()">isAtomicType</A></B>()</CODE>
<BR>
Determine whether this item type is an atomic type</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#isAtomizable()">isAtomizable</A></B>()</CODE>
<BR>
Ask whether values of this type are atomizable</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#isPlainType()">isPlainType</A></B>()</CODE>
<BR>
Determine whether this item type is a plain type (that is, whether it can ONLY match
atomic values)</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#matches(net.sf.saxon.om.Item, net.sf.saxon.expr.XPathContext)">matches</A></B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> item,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</CODE>
<BR>
Test whether a given item conforms to this type</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#matchesItem(net.sf.saxon.om.Item, boolean, net.sf.saxon.Configuration)">matchesItem</A></B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> item,
boolean allowURIPromotion,
<A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> config)</CODE>
<BR>
Test whether a given item conforms to this type</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <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></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#toString(net.sf.saxon.om.NamePool)">toString</A></B>(<A HREF="../../../../net/sf/saxon/om/NamePool.html" title="class in net.sf.saxon.om">NamePool</A> pool)</CODE>
<BR>
Produce a representation of this type name for use in error messages.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/type/ItemType.html#visitNamedSchemaComponents(net.sf.saxon.type.SchemaComponentVisitor)">visitNamedSchemaComponents</A></B>(<A HREF="../../../../net/sf/saxon/type/SchemaComponentVisitor.html" title="interface in net.sf.saxon.type">SchemaComponentVisitor</A> visitor)</CODE>
<BR>
Visit all the schema components used in this ItemType definition</TD>
</TR>
</TABLE>
<P>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="isAtomicType()"><!-- --></A><H3>
isAtomicType</H3>
<PRE>
boolean <B>isAtomicType</B>()</PRE>
<DL>
<DD>Determine whether this item type is an atomic type
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if this is ANY_ATOMIC_TYPE or a subtype thereof</DL>
</DD>
</DL>
<HR>
<A NAME="isPlainType()"><!-- --></A><H3>
isPlainType</H3>
<PRE>
boolean <B>isPlainType</B>()</PRE>
<DL>
<DD>Determine whether this item type is a plain type (that is, whether it can ONLY match
atomic values)
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if this is ANY_ATOMIC_TYPE or a subtype thereof, or a
"plain" union type (that is, unions of atomic types that impose no further restrictions)</DL>
</DD>
</DL>
<HR>
<A NAME="matches(net.sf.saxon.om.Item, net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
matches</H3>
<PRE>
boolean <B>matches</B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> item,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</PRE>
<DL>
<DD>Test whether a given item conforms to this type
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>item</CODE> - The item to be tested<DD><CODE>context</CODE> - the XPath dynamic evaluation context
<DT><B>Returns:</B><DD>true if the item is an instance of this type; false otherwise</DL>
</DD>
</DL>
<HR>
<A NAME="matchesItem(net.sf.saxon.om.Item, boolean, net.sf.saxon.Configuration)"><!-- --></A><H3>
matchesItem</H3>
<PRE>
boolean <B>matchesItem</B>(<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A> item,
boolean allowURIPromotion,
<A HREF="../../../../net/sf/saxon/Configuration.html" title="class in net.sf.saxon">Configuration</A> config)</PRE>
<DL>
<DD>Test whether a given item conforms to this type
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>item</CODE> - The item to be tested<DD><CODE>allowURIPromotion</CODE> - if a URI value is to be treated as a string<DD><CODE>config</CODE> - the Saxon configuration
<DT><B>Returns:</B><DD>true if the item is an instance of this type; false otherwise</DL>
</DD>
</DL>
<HR>
<A NAME="getSuperType(net.sf.saxon.type.TypeHierarchy)"><!-- --></A><H3>
getSuperType</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/type/ItemType.html" title="interface in net.sf.saxon.type">ItemType</A> <B>getSuperType</B>(<A HREF="../../../../net/sf/saxon/type/TypeHierarchy.html" title="class in net.sf.saxon.type">TypeHierarchy</A> th)</PRE>
<DL>
<DD>Get the type from which this item type is derived by restriction. This
is the supertype in the XPath type heirarchy, as distinct from the Schema
base type: this means that the supertype of xs:boolean is xs:anyAtomicType,
whose supertype is item() (rather than xs:anySimpleType).
<p>
In fact the concept of "supertype" is not really well-defined, because the types
form a lattice rather than a hierarchy. The only real requirement on this function
is that it returns a type that strictly subsumes this type, ideally as narrowly
as possible.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>th</CODE> - the type hierarchy cache
<DT><B>Returns:</B><DD>the supertype, or null if this type is item()</DL>
</DD>
</DL>
<HR>
<A NAME="getPrimitiveItemType()"><!-- --></A><H3>
getPrimitiveItemType</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/type/ItemType.html" title="interface in net.sf.saxon.type">ItemType</A> <B>getPrimitiveItemType</B>()</PRE>
<DL>
<DD>Get the primitive item type corresponding to this item type. For item(),
this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds,
it is the value representing the node kind, for example Type.ELEMENT.
For anyAtomicValue and union types it is Type.ATOMIC_VALUE. For numeric it is Type.NUMBER.
For other atomic types it is the primitive type as defined in XML Schema,
except that integer, xs:dayTimeDuration, and xs:yearMonthDuration
are considered to be primitive types.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the corresponding primitive type</DL>
</DD>
</DL>
<HR>
<A NAME="getPrimitiveType()"><!-- --></A><H3>
getPrimitiveType</H3>
<PRE>
int <B>getPrimitiveType</B>()</PRE>
<DL>
<DD>Get the primitive type corresponding to this item type. For item(),
this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds,
it is the value representing the node kind, for example Type.ELEMENT.
For anyAtomicValue it is BuiltInAtomicType.ANY_ATOMIC. For numeric it is Type.NUMBER.
For other atomic types it is the primitive type as defined in XML Schema,
except that INTEGER is considered to be a primitive type.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the integer fingerprint of the corresponding primitive type</DL>
</DD>
</DL>
<HR>
<A NAME="getDefaultPriority()"><!-- --></A><H3>
getDefaultPriority</H3>
<PRE>
double <B>getDefaultPriority</B>()</PRE>
<DL>
<DD>Determine the default priority of this item type when used on its own as a Pattern
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the default priority</DL>
</DD>
</DL>
<HR>
<A NAME="toString(net.sf.saxon.om.NamePool)"><!-- --></A><H3>
toString</H3>
<PRE>
<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> <B>toString</B>(<A HREF="../../../../net/sf/saxon/om/NamePool.html" title="class in net.sf.saxon.om">NamePool</A> pool)</PRE>
<DL>
<DD>Produce a representation of this type name for use in error messages.
Where this is a QName, it will use conventional prefixes
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>pool</CODE> - the name pool
<DT><B>Returns:</B><DD>a string representation of the type, in notation resembling but not necessarily
identical to XPath syntax</DL>
</DD>
</DL>
<HR>
<A NAME="getAtomizedItemType()"><!-- --></A><H3>
getAtomizedItemType</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/type/PlainType.html" title="interface in net.sf.saxon.type">PlainType</A> <B>getAtomizedItemType</B>()</PRE>
<DL>
<DD>Get the item type of the atomic values that will be produced when an item
of this type is atomized
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the best available item type of the atomic values that will be produced when an item
of this type is atomized</DL>
</DD>
</DL>
<HR>
<A NAME="isAtomizable()"><!-- --></A><H3>
isAtomizable</H3>
<PRE>
boolean <B>isAtomizable</B>()</PRE>
<DL>
<DD>Ask whether values of this type are atomizable
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true unless it is known that these items will be elements with element-only
content, or function items, in which case return false</DL>
</DD>
</DL>
<HR>
<A NAME="visitNamedSchemaComponents(net.sf.saxon.type.SchemaComponentVisitor)"><!-- --></A><H3>
visitNamedSchemaComponents</H3>
<PRE>
void <B>visitNamedSchemaComponents</B>(<A HREF="../../../../net/sf/saxon/type/SchemaComponentVisitor.html" title="interface in net.sf.saxon.type">SchemaComponentVisitor</A> visitor)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Visit all the schema components used in this ItemType definition
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>visitor</CODE> - the visitor class to be called when each component is visited
<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 occurs</DL>
</DD>
</DL>
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