XSLT 2.0 Compare sequence of attribute values to variable

Question

I have elements such as

<elem attr1="value1 someValue" attr2="value2 someOtherValue"/>

elements with a variable amount of attributes that each have a variable amount of values.

Some of these attributes' names and some of their values are saved in variables beforehand and the elements are checked against these variables.

I need to check if the element has attributes specified in that variable (which I got working) and if for each attribute, at least one of its values is one of the values specified in another variable.

So if the variable contains " Value1 Value2 " (or more values)

The element

<elem attr1="Value1 SomeValue" attr2="Value1 someOtherValue AthirdValue" attr3="value2 otherValue"/>

meets the requirements (provided that attr1, attr2 and attr3 are the correct attribute names, which I check before), but element:

<elem attr1="Value1 SomeValue" attr2="anything someOtherValue" attr3="value otherValue"/>

doesn't meet the requirements, because one of the attributes has no value that is contained in the variable ( attr2 : neither anything nor someOtherValue are specified in the variable).

I tried tokenizing the values, but then the elemens are considered correct even if only one attribute has one of the correct values. I need to make sure, all of the attributes have at least one of the correct values.

Help and tips highly appreciated!

EDIT:

The way the values of the variable are obtained:

<xsl:variable name="filterName" select="$someDoc//someElem[@id = $curID]//filters/@value"/>

The other document:

<?xml version="1.0"/>
<doc>
<filters name="attr1" value="value1"/>
<filters name="attr2" value="value2"/>
<filters name="attr3" value="value2"/>
</doc>

**EDIT 2:**

Looking at the filters elements above, the elems can look like this:

<elem/> <!-- no attribute -->
<elem someattr="somevalue"/> <!-- some irrelevant attribute -->
<elem attr1="value1"/> <!-- one of the attributes -->
<elem attr1="value1" attr2="value"/> <!-- two of the attributes -->

So the @name attribute of the filters element specifies the name of the attribute on the elem element and the @value attribute of the filters element specifies the value that that attribute must have in order to meet the requirements.

SOLUTION (adapted from answer post)

<xsl:when test="count(@*[local-name() = $filterNames]) > 1">
<!-- element has more then one filter attribute -->
    <xsl:variable name="currentFilterValues">
        <xsl:value-of select="$filterValues"/>
    </xsl:variable>
    <xsl:variable name="attributeNamesOfCurrentElement">
        <xsl:value-of select="@*[local-name() = $filterNames]/fn:local-name()"/>
    </xsl:variable>
    <xsl:variable name="errors">
        <xsl:for-each select="tokenize($attributeNamesOfCurrentElement, '\s+')">
            <xsl:variable name="currentName" select="."/>
            <xsl:variable name="currentValue" select="$currentElement/@*[fn:local-name() = $currentName]"/>
            <xsl:if test="not(tokenize($currentValue, '\s+') = tokenize($currentFilterValues, ' '))">
                <error/>
            </xsl:if>
        </xsl:for-each>
    </xsl:variable>
    <xsl:choose>
        <xsl:when test="$errors/error">
            <!-- at least one attribute doesnt have any of the required values -->
        </xsl:when>
        <xsl:otherwise>
            <!-- all attributes have at least one of the required values -->
            <xsl:copy>
                <xsl:apply-templates select="$currentElement_2/@*"/>
                <xsl:if test="child::*">
                    <xsl:for-each select="child::*">
                        <xsl:call-template name="recurse">
                            <xsl:with-param name="filterNames" select="$filterNames"/>
                            <xsl:with-param name="filterValues" select="$filterValues"/>
                            <xsl:with-param name="filterType" select="$filterType"/>
                            <xsl:with-param name="currentElement_2" select="."/>
                        </xsl:call-template>
                    </xsl:for-each>
                </xsl:if>
            </xsl:copy>
        </xsl:otherwise>
    </xsl:choose>
</xsl:when>

Answer 1

This is all a bit abstract, but to demonstrate a principle, let us have the following:

XML

<root>
    <elem attr1="alpha charlie" attr2="delta alpha echo" attr3="foxtrot bravo golf"/>
    <elem attr1="alpha charlie" attr2="hotel delta" attr3="bravo india"/> 
</root>

XSLT 2.0

<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:variable name="values" select="('alpha', 'bravo')"/>

<xsl:template match="/root">
    <xsl:copy>
        <xsl:apply-templates select="elem"/>
    </xsl:copy>
</xsl:template>     

<xsl:template match="elem">
    <xsl:copy>
        <xsl:choose>
            <xsl:when test="@*[not(tokenize(., ' ')=$values)]">
                <xsl:text>NO</xsl:text>
            </xsl:when>
            <xsl:otherwise>
                <xsl:text>YES</xsl:text>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:copy>
</xsl:template>

</xsl:stylesheet>

Result

<?xml version="1.0" encoding="UTF-8"?>
<root>
   <elem>YES</elem>
   <elem>NO</elem>
</root>

Explanation

The test:

test="@*[not(tokenize(., ' ')=$values)]"

returns true when there is at least one attribute that, after tokenizing, does not contain any token that matches one of the values in the $values variable.

---

Edit

In response to your modified requirements, I believe this should work:

XSLT 2.0

<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:variable name="filter-doc" select="document('filter.xml')"/>

<xsl:key name="filter-by-name" match="filters" use="@name" />

<xsl:template match="/root">
    <xsl:copy>
        <xsl:apply-templates select="elem"/>
    </xsl:copy>
</xsl:template>     

<xsl:template match="elem">
    <xsl:variable name="strikes">
        <xsl:for-each select="@*[key('filter-by-name', name(), $filter-doc)]">
            <xsl:variable name="values" select="key('filter-by-name', name(), $filter-doc)/@value" />
            <xsl:if test="not(tokenize(., ' ')=$values)">
                <strike/>
            </xsl:if>
        </xsl:for-each>
    </xsl:variable>

    <xsl:copy>
        <xsl:choose>
            <xsl:when test="$strikes/strike">
                <xsl:text>NO</xsl:text>
            </xsl:when>
            <xsl:otherwise>
                <xsl:text>YES</xsl:text>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:copy>
</xsl:template>

</xsl:stylesheet>

This could probably be streamlined a bit, but first I would like to know if it provides the correct answers.