Dumb XSL question

[babysimon]

For some reason XSL just won't stick in my brain, so I have to ask my friends list.

If I have a document which contains AAA nodes and I want to transform them to BBB nodes I can do something like:

	<xsl:template match="AAA">
		<BBB><xsl:apply-templates/></BBB>
	</xsl:template>

But suppose I want to replace every AAA immediately followed by a CCC (throwing the CCC away)? Something like

	<xsl:template match="AAA/following-sibling::CCC[1]">
		<BBB><xsl:apply-templates/></BBB>
	</xsl:template>

is my guess, but then I'm told "Only child:: and attribute:: axes are allowed in match patterns!"

Anyone got any clues? I'm trying to pretend this isn't just directed at lozette...

Comments

[lozette.livejournal.com]

I'd probably do something like:

xsl:template match="AAA"
xsl:if test="following-sibling::*[1][name() = 'CCC']"
...do something
/
/

Not very elegant, though, and totally untested!!

If that doesn't work or isn't right/convenient let me know.

[babysimon]

Hmmm. That only matches the AAA though, doesn't it? I'm trying to match the AAA and the CCC (or at least cause all CCCs that directly follow AAAs to disappear).

Thank you for helping, by the way!

[lozette.livejournal.com]

OK, so you want to match all the CCCs and only throw them away if they directly follow an AAA (otherwise, do something with them)?

In that case, maybe:

xsl:template match="AAA"
xsl:if test="following-sibling::*[1][name() = 'CCC']"
...do something
/
/

xsl:template match="CCC"
xsl:if test="not(preceding-sibling::*[1][name() = 'AAA')"
...do something
/
/

Or, you could do it sort of backwards...

<xsl:template match="CCC">
<xsl:choose>
<xsl:when test="preceding-sibling::*[1][name() = AAA">
<xsl:apply-templates select="preceding-sibling::AAA[1]" mode="theOneBefore"/>
</xsl:when>
<xsl:otherwise>
...do what you want to do with all CCCs that don't have a preceding AAA
</xsl:otherwise>
</xsl:template>

<xsl:template match="AAA" mode="theOneBefore">
...do what you want to do with all AAAs that have a CCC after them
</xsl:template>

<xsl:template match="AAA"/>
...empty template to match all other AAAs, assuming you have any. Or you can do something in here if you want to.

Again, no idea if this does exactly what you want cos I'm still a bit fuzzy on the requirement ;-)

[babysimon]

This sounds like the sort of stuff I want to do. Thank you very much! I owe you a... dunno, what do you want?

Requirements were a bit fuzzy 'cos the actual situation is a bit stupid and I'm embarrassed...

[ciphergoth.livejournal.com]

You want to put the "following-sibling" stuff inside the square brackets representing the test...