RE: Identifying two tags that share some attribute nam

Zack Brown wrote:
> Wow, a very simple solution!

There's actually another way you can do this that eliminates the
xsl:for-each and uses XSLT 2.0's new "separator" attribute on xsl:value-of
as follows:

    <xsl:variable name="b" select="document('2.xml')/outsidedata/b
                             [every $att in @* satisfies current()/@*
                                    [.=$att and name(.)=name($att)]]"/>
    <xsl:if test="$b">
      <xsl:text>[</xsl:text>
    </xsl:if>
    <xsl:value-of select="$b" separator="]&#xA;["/>
               <!-- character reference is necessary -->
    <xsl:if test="$b">
      <xsl:text>]</xsl:text>
    </xsl:if>

If you didn't need the outer delimiters (before the first item and after the
last item), you could get rid of the variable and xsl:if tests and simply
write:

  <xsl:value-of select="document('2.xml')/outsidedata/b
                             [every $att in @* satisfies current()/@*
                                    [.=$att and name(.)=name($att)]]"
                separator=","/>

Evan


> On Mon, May 06, 2002 at 12:55:32AM -0700, Evan Lenz wrote:
> > [NOTE: XPath 2.0 is still in Working Draft stage, subject to
> change, and not
> > yet ready for prime time.]
> >
> > While the magical expression you want cannot be expressed in
> XPath 1.0, it
> > can easily be expressed in XPath 2.0:
> >
> >
> > document('2.xml')/outsidedata/b
> >     [every $att in @* satisfies current()/@*
> >          [.=$att and node-name(.)=node-name($att)]]
> >
> >
> > The "every" expression is called a universal quantifier[1] and
> enables you
> > to test that a condition applies for *every* node in a given
> sequence. This
> > is something that could not be done in general in XPath 1.0.
> >
> > The node-name() function[2] returns an "expanded QName" type
> that consists
> > of a local/URI pair that can in turn be compared with other
> expanded names.
> > This ensures that your code is robust in the face of namespace-qualified
> > attributes without having to write [local-name(.)=local-name($att) and
> > namespace-uri(.)=namespace-uri($att)]. This is a welcome
> shorthand indeed!
> >
> > Except for the node-name() function, I'm happy to report that a
> stylesheet
> > with this expression (using name() instead) is executed as
> expected by Saxon
> > 7.1. Below is the stylesheet I ran against your two files:
> >
> >
> > <xsl:stylesheet version="2.0"
> > xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> >
> >   <xsl:output method="text"/>
> >
> >   <xsl:template match="/">
> >     <xsl:apply-templates select="/mydata/a"/>
> >   </xsl:template>
> >
> >   <xsl:template match="/mydata/a">
> >     <xsl:for-each select="document('2.xml')/outsidedata/b
> >                              [every $att in @* satisfies current()/@*
> >                                     [.=$att and name(.)=name($att)]]">
> >       <xsl:text>[</xsl:text>
> >       <xsl:value-of select="."/>
> >       <xsl:text>]</xsl:text>
> >       <xsl:if test="position() != last()">
> >         <xsl:text>
> > </xsl:text>
> >       </xsl:if>
> >     </xsl:for-each>
> >   </xsl:template>
> >
> > </xsl:stylesheet>
> >
> >
> > Invocation and output:
> >
> > $ java net.sf.saxon.Transform 1.xml test.xsl
> > [PPP]
> > [QQQ]
> > [RRR]
> > $
> >
> > With your (corrected) reformulation of the original problem, I
> believe the
> > expression only needs slight modification (@* trades places with
> > current()/@*):
> >
> > document('2.xml')/outsidedata/b
> >     [every $att in current()/@* satisfies @*
> >          [.=$att and node-name(.)=node-name($att)]]
> >
> > Hope you found this helpful, or at least interesting!
> >
> > Evan
> >
> > [1] http://www.w3.org/TR/xpath20/#id-quantified-expressions
> > [2] http://www.w3.org/TR/xquery-operators/#func-node-name


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