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[xsl] Need help OR'ing in XPATH.

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Hello,

For my contrived example below, I would like to select all book nodes whose owner is "aaa" *or* which have a chapter whose owner is "aaa", and I would like the books to be retrieved in the same general order as the xml document, i.e., the query for the example below would process books with id's 1, 3, 4 (in that order), not 1, 4, 3.

I can do the XPATH for *either* of the two cases, but don't know how to combine the two for an OR search in my xsl:apply-templates select statement.

<xsl:a-t select="book[owner='aaa'] or book/chapter[owner='aaa']"/>

is kind of what I want, but Xalan is complaining that my select attribute is just returning a boolean, so my syntax is apparently wrong.

Any help would be much appreciated.

Thanks,
Glen

<book id="1">
    <owner>aaa</owner>
    <chapter>
        <owner>bbb</owner>
    </chapter>
    <chapter>
        <owner>ccc</owner>
    </chapter>
</book>
<book id="2">
    <owner>bbb</owner>
    <chapter>
        <owner>bbb</owner>
    </chapter>
    <chapter>
        <owner>ccc</owner>
    </chapter>
</book>
<book id="3">
    <owner>ccc</owner>
    <chapter>
        <owner>aaa</owner>
    </chapter>
    <chapter>
        <owner>ccc</owner>
    </chapter>
</book>
<book id="4">
    <owner>aaa</owner>
    <chapter>
        <owner>bbb</owner>
    </chapter>
    <chapter>
        <owner>ccc</owner>
    </chapter>
</book>

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