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Is there an exclusive OR 'XOR' in XPath1.0 ?
883
The dot, or period, character (“.”) in XPath is called the “context item expression” because it refers to the context item. This could be a node (such as an element, attribute, or text node), or an atomic value (such as a string, number, or boolean). When it's a node, it's also called the context node.
Every mapping is a relation but every relation is not a mapping.
Notice that we used > instead of > in the attribute value. You're always safe using > here, although some XSLT processors process the greater-than sign correctly if you use > instead. If you need to use the less-than operator ( < ), you'll have to use the < entity.
Use this XPath 1.0 expression:
x and not(y) or y and not(x)
Always try to avoid the != operator, because it has an unexpected meaning/behavior when one or both of its arguments are node-sets.
In XSLT 2.0 or XQuery 1.0 one can write this as a function and then use just the function in any XPath expression. Below is an XSLT 2.0 function definition for xor and a small example of using this function:
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:f="my:f">
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:sequence select=
"for $x in (true(), false()),
$y in (true(), false())
return
('xor(', $x, ',', $y,') = ', f:xor($x, $y), '
')
"/>
</xsl:template>
<xsl:function name="f:xor">
<xsl:param name="pX" as="xs:boolean"/>
<xsl:param name="pY" as="xs:boolean"/>
<xsl:sequence select=
"$pX and not($pY) or $pY and not($pX)"/>
</xsl:function>
</xsl:stylesheet>
when this transformation is applied on any XML document (not used), the wanted, correct result is produced:
xor( true , true ) = false
xor( true , false ) = true
xor( false , true ) = true
xor( false , false ) = false
No but you can emulate it:
(a or b) and (a != b)
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