RE: [xsl] How to use the same expression in a match and a select test

Subject: RE: [xsl] How to use the same expression in a match and a select test
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Mon, 3 Dec 2007 13:57:17 -0000
You're using XSLT 2.0 so you can write $NO_BLOCK_ELEMENTS and
$SAME_ATTRIBUTES as stylesheet functions returning a boolean:

<xsl:function name="f:is-no-block-element" as="xs:boolean">
  <xsl:param name="n" as="element()"/>
  <xsl:sequence select="not(self::blockquote|self::center...)"/>


Alternatively, many of the elements listed have a schema type of Inline in
the XHTML schema, so you could refer to them collectively as element(*,
Inline) if you import the schema.

The test string-join(@*,'xx') = string-join(current()/@*,'xx') looks wrong -
it's relying on the order in which attributes are returned by @*, which may
vary from one element to the next.

It looks to me as if your code could also benefit from using
<xsl:for-each-group group-adjacent="...">

Michael Kay

> -----Original Message-----
> From: Sascha Mantscheff [mailto:922492@xxxxxx] 
> Sent: 03 December 2007 13:21
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] How to use the same expression in a match and 
> a select test
> I have a stylesheet with a template and a for-each statement.
> Both select their elements by an expression which differs 
> only in one part from each other.
> The template is:
> <xsl:template match="*[not(self::blockquote|self::center|self::BODY|
> self::body|self::div|self::dl|self::dt|self::HEAD|self::head|s
> elf::HTML|
> self::img|self::h1|self::h2|self::h3|self::h4|self::h5|self::h6|
> self::hr|self::html|self::idx:*|self::form|
> self::mbp:*[not(self::mbp:nu)]|self::mmc:*|self::ol|self::p|se
> lf::table|
> self::td|self::th|self::tr|
> self::ul)][preceding-sibling::node()[1][name()=name(current()) and
> string-join(@*,'xx') = string-join(current()/@*,'xx')]]"
> />
> The for-each select is:
> <xsl:for-each 
> select="following-sibling::node()[1][not(self::blockquote|
> self::center|self::BODY|self::body|self::div|self::dl|self::dt|
> self::HEAD|self::head|self::HTML|self::img|self::h1|self::h2|self::h3|
> self::h4|self::h5|self::h6|self::hr|self::html|self::idx:*|self::form|
> self::mbp:*[not(self::mbp:nu)]|self::mmc:*|self::ol|self::p|se
> lf::table|
> self::td|self::th|self::tr|self::ul)] [name()=name(current()) and
> string-join(@*,'xx') = string-join(current()/@*,'xx')]">
> How can I reduce the redundancy and use the same expression 
> in both statements, like in this pseudo code:
> <xsl:template
> match="*[$NO_BLOCK_ELEMENTS][preceding-sibling::node()[1][name
> ()=name(current()) and $SAME_ATTRIBUTES]]"
> />
> <xsl:for-each select="following-sibling::node()[1][$NO_BLOCK_ELEMENTS]
> [name()=name(current()) and $SAME_ATTRIBUTES]">

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