xpath : compare tokenized list with another tokenized list - xpath

Question

In xslt I have a variable which has a single string with space as delimiter.
var_1 = 'cat dog cow'
The following xml is present for which the 'name' attribute has value with space as delimiter.
<top_element>
<element_10>
<element_11>
<element_000 name="cow cat">
string_1
</element_000>
</element_11>
</element_10>
<element_20 name="bat">
<element_21>
<element_000 name="cow cat">
string_2
</element_000>
</element_21>
</element_20>
<element_30 name="bat dog">
<element_31>
<element_000 name="cow cat">
string_3
</element_000>
</element_31>
</element_30>
<element_40 >
<element_41>
<element_000 name="cow bat">
string_4
</element_000>
</element_41>
</element_40>
</top_element>
Question:
Handle the element_000 in the xml only if, for ancestor or self of element:
name attribute is not defined or
value of 'name' attribute contains at least one value of 'var_1.
While parsing the xml using xslt, the output html should contain only the following strings:
string_1
string_3
string_4
The string_2 should not be displayed, as its ancestor has name value which does not match with any of the values in the var_1 list.
My try:
Note: I am using xslt version 2.0
<xsl:template match="element_000">
<choose>
<xsl:when test"(ancestor-or-self::*[(tokenize(#name,'\s+')) != (tokenize($var_1,'\s+'))])">
<--Handle the element-->
</xsl:when>
</xsl:choose>
</xsl:template>
This approach did not work for me. Please let me know if this is possible by some other way.
Thanks
SRB.

Answer 1

If you use
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="var_1" select="'cat dog cow'"/>
<xsl:variable name="names" select="tokenize($var_1, ' ')"/>
<xsl:template match="text()"/>
<xsl:template match="element_000[every $el in ancestor-or-self::*
satisfies (not(exists($el/#name)) or $names = tokenize($el/#name, ' '))]">
<xsl:copy-of select="."/>
</xsl:template>
</xsl:stylesheet>
then the output contains only the elements
<element_000 name="cow cat">
string_1
</element_000><element_000 name="cow cat">
string_3
</element_000><element_000 name="cow bat">
string_4
</element_000>