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This example shows how you can compare and combine the results in different node-sets.
Using the union operator (|) two or more sets can be combined to one set (the nodes that
occur in both sets should occur only once in the resulting conbination). Using this combining
of node-sets, we can also find the intersection of two node-sets: the technique to do this
was presented by Michael Kay and is shown in this example.
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="books_by_rh"
select="//book[author-ref/@ref='rh']"/>
<xsl:variable name="books_by_more_than_one_author"
select="//book[count(author-ref) > 1]"/>
<xsl:template match="/">
Total number of books by Robert Heinlein: <xsl:value-of
select="count($books_by_rh)" />
Total number of books by several authors: <xsl:value-of
select="count($books_by_more_than_one_author)" />
Number of books in the union of the two sets <xsl:value-of
select="count($books_by_rh|$books_by_more_than_one_author)"/>
Number of books in the intersection of the two sets <xsl:value-of
select="count($books_by_rh[count(.|$books_by_more_than_one_author)=
count($books_by_more_than_one_author)])"/>
</xsl:template>
</xsl:stylesheet>
<?xml version="1.0" encoding="utf-8"?>
Total number of books by Robert Heinlein: 2
Total number of books by several authors: 2
Number of books in the union of the two sets 3
Number of books in the intersection of the two sets 1<?xml version="1.0" encoding="utf-8"?>
Total number of books by Robert Heinlein: 2
Total number of books by several authors: 2
Number of books in the union of the two sets 3
Number of books in the intersection of the two sets 1<?xml version="1.0" encoding="UTF-8"?>
Total number of books by Robert Heinlein: 2
Total number of books by several authors: 2
Number of books in the union of the two sets 3
Number of books in the intersection of the two sets 1<?xml version="1.0" encoding="UTF-16"?>
Total number of books by Robert Heinlein: 2
Total number of books by several authors: 2
Number of books in the union of the two sets 3
Number of books in the intersection of the two sets 1<?xml version="1.0" encoding="utf-8"?>
Total number of books by Robert Heinlein: 2
Total number of books by several authors: 2
Number of books in the union of the two sets 3
Number of books in the intersection of the two sets 1
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