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FunctionItem
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net.sf.saxon.om</FONT>
<BR>
Interface FunctionItem<T extends FunctionItem></H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A><T>, <A HREF="../../../../net/sf/saxon/evpull/PullEvent.html" title="interface in net.sf.saxon.evpull">PullEvent</A>, <A HREF="../../../../net/sf/saxon/om/ValueRepresentation.html" title="interface in net.sf.saxon.om">ValueRepresentation</A><T></DD>
</DL>
<DL>
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../com/saxonica/functions/map/MapItem.html" title="interface in com.saxonica.functions.map">MapItem</A></DD>
</DL>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../com/saxonica/functions/hof/AbstractFunctionItem.html" title="class in com.saxonica.functions.hof">AbstractFunctionItem</A>, <A HREF="../../../../com/saxonica/functions/hof/CoercedFunction.html" title="class in com.saxonica.functions.hof">CoercedFunction</A>, <A HREF="../../../../com/saxonica/functions/hof/CurriedFunction.html" title="class in com.saxonica.functions.hof">CurriedFunction</A>, <A HREF="../../../../com/saxonica/functions/hof/FirstClassFunction.html" title="class in com.saxonica.functions.hof">FirstClassFunction</A>, <A HREF="../../../../com/saxonica/functions/map/ImmutableMap.html" title="class in com.saxonica.functions.map">ImmutableMap</A>, <A HREF="../../../../com/saxonica/functions/map/SingletonMap.html" title="class in com.saxonica.functions.map">SingletonMap</A>, <A HREF="../../../../com/saxonica/functions/hof/UserFunctionItem.html" title="class in com.saxonica.functions.hof">UserFunctionItem</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>FunctionItem<T extends FunctionItem></B><DT>extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A><T>, <A HREF="../../../../net/sf/saxon/om/ValueRepresentation.html" title="interface in net.sf.saxon.om">ValueRepresentation</A><T></DL>
</PRE>
<P>
XDM 3.0 introduces a third kind of item, beyond nodes and atomic values: the function item. Function
items implement this marker interface. The actual implementation class is in Saxon-PE and Saxon-EE only.
<P>
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<TH ALIGN="left"><B>Fields inherited from interface net.sf.saxon.om.<A HREF="../../../../net/sf/saxon/om/ValueRepresentation.html" title="interface in net.sf.saxon.om">ValueRepresentation</A></B></TH>
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<TD><CODE><A HREF="../../../../net/sf/saxon/om/ValueRepresentation.html#EMPTY_VALUE_ARRAY">EMPTY_VALUE_ARRAY</A></CODE></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/FunctionItem.html" title="interface in net.sf.saxon.om">FunctionItem</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/om/FunctionItem.html#curry(net.sf.saxon.om.ValueRepresentation[])">curry</A></B>(<A HREF="../../../../net/sf/saxon/om/ValueRepresentation.html" title="interface in net.sf.saxon.om">ValueRepresentation</A><? extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>>[] values)</CODE>
<BR>
Curry a function by binding one or more (but not all) of its arguments</TD>
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<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/om/FunctionItem.html#deepEquals(net.sf.saxon.om.FunctionItem, net.sf.saxon.expr.XPathContext, net.sf.saxon.expr.sort.GenericAtomicComparer, int)">deepEquals</A></B>(<A HREF="../../../../net/sf/saxon/om/FunctionItem.html" title="interface in net.sf.saxon.om">FunctionItem</A> other,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context,
<A HREF="../../../../net/sf/saxon/expr/sort/GenericAtomicComparer.html" title="class in net.sf.saxon.expr.sort">GenericAtomicComparer</A> comparer,
int flags)</CODE>
<BR>
Test whether this FunctionItem is deep-equal to another function item,
under the rules of the deep-equal function</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/om/FunctionItem.html#getArity()">getArity</A></B>()</CODE>
<BR>
Get the arity of the function</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/type/FunctionItemType.html" title="interface in net.sf.saxon.type">FunctionItemType</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/om/FunctionItem.html#getFunctionItemType(net.sf.saxon.type.TypeHierarchy)">getFunctionItemType</A></B>(<A HREF="../../../../net/sf/saxon/type/TypeHierarchy.html" title="class in net.sf.saxon.type">TypeHierarchy</A> th)</CODE>
<BR>
Get the item type of the function item</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/om/FunctionItem.html#getFunctionName()">getFunctionName</A></B>()</CODE>
<BR>
Get the name of the function, or null if it is anonymous</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A><? extends <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/om/FunctionItem.html#invoke(net.sf.saxon.om.SequenceIterator[], net.sf.saxon.expr.XPathContext)">invoke</A></B>(<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A><? extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>>[] args,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)</CODE>
<BR>
Invoke the function</TD>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from interface net.sf.saxon.om.<A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../net/sf/saxon/om/Item.html#getStringValue()">getStringValue</A>, <A HREF="../../../../net/sf/saxon/om/Item.html#getStringValueCS()">getStringValueCS</A>, <A HREF="../../../../net/sf/saxon/om/Item.html#getTypedValue()">getTypedValue</A></CODE></TD>
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<A NAME="getFunctionItemType(net.sf.saxon.type.TypeHierarchy)"><!-- --></A><H3>
getFunctionItemType</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/type/FunctionItemType.html" title="interface in net.sf.saxon.type">FunctionItemType</A> <B>getFunctionItemType</B>(<A HREF="../../../../net/sf/saxon/type/TypeHierarchy.html" title="class in net.sf.saxon.type">TypeHierarchy</A> th)</PRE>
<DL>
<DD>Get the item type of the function item
<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 function item's type</DL>
</DD>
</DL>
<HR>
<A NAME="getFunctionName()"><!-- --></A><H3>
getFunctionName</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/om/StructuredQName.html" title="class in net.sf.saxon.om">StructuredQName</A> <B>getFunctionName</B>()</PRE>
<DL>
<DD>Get the name of the function, or null if it is anonymous
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the function name, or null for an anonymous inline function</DL>
</DD>
</DL>
<HR>
<A NAME="getArity()"><!-- --></A><H3>
getArity</H3>
<PRE>
int <B>getArity</B>()</PRE>
<DL>
<DD>Get the arity of the function
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of arguments in the function signature</DL>
</DD>
</DL>
<HR>
<A NAME="invoke(net.sf.saxon.om.SequenceIterator[], net.sf.saxon.expr.XPathContext)"><!-- --></A><H3>
invoke</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A><? extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>> <B>invoke</B>(<A HREF="../../../../net/sf/saxon/om/SequenceIterator.html" title="interface in net.sf.saxon.om">SequenceIterator</A><? extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>>[] args,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Invoke the function
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - the actual arguments to be supplied<DD><CODE>context</CODE> - the XPath dynamic evaluation context
<DT><B>Returns:</B><DD>the result of invoking the function
<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 within the function</DL>
</DD>
</DL>
<HR>
<A NAME="curry(net.sf.saxon.om.ValueRepresentation[])"><!-- --></A><H3>
curry</H3>
<PRE>
<A HREF="../../../../net/sf/saxon/om/FunctionItem.html" title="interface in net.sf.saxon.om">FunctionItem</A> <B>curry</B>(<A HREF="../../../../net/sf/saxon/om/ValueRepresentation.html" title="interface in net.sf.saxon.om">ValueRepresentation</A><? extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>>[] values)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Curry a function by binding one or more (but not all) of its arguments
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - the values to which the arguments are to be bound, representing an unbound argument (a placeholder)
by null
<DT><B>Returns:</B><DD>a new function item in which the specified arguments of the original function are bound to a value
<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</DL>
</DD>
</DL>
<HR>
<A NAME="deepEquals(net.sf.saxon.om.FunctionItem, net.sf.saxon.expr.XPathContext, net.sf.saxon.expr.sort.GenericAtomicComparer, int)"><!-- --></A><H3>
deepEquals</H3>
<PRE>
boolean <B>deepEquals</B>(<A HREF="../../../../net/sf/saxon/om/FunctionItem.html" title="interface in net.sf.saxon.om">FunctionItem</A> other,
<A HREF="../../../../net/sf/saxon/expr/XPathContext.html" title="interface in net.sf.saxon.expr">XPathContext</A> context,
<A HREF="../../../../net/sf/saxon/expr/sort/GenericAtomicComparer.html" title="class in net.sf.saxon.expr.sort">GenericAtomicComparer</A> comparer,
int flags)
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
<DL>
<DD>Test whether this FunctionItem is deep-equal to another function item,
under the rules of the deep-equal function
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>other</CODE> - the other function item<DD><CODE>context</CODE> - the dynamic evaluation context<DD><CODE>comparer</CODE> - the object to perform the comparison<DD><CODE>flags</CODE> - options for how the comparison is performed
<DT><B>Returns:</B><DD>true if the two function items are deep-equal
<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 the comparison cannot be performed</DL>
</DD>
</DL>
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