Subject: Re: [xsl] How to copy only the really existing <choice> branch/element? "value-of-if-exist" From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx> Date: Wed, 07 Oct 2009 08:19:08 -0400 |
Assume I have a XML source based on the following (simplified) XSD schema:
<xsd:element name="top" type="mytype"/>
<xsd:complexType name="mytype"> <xsd:choice> <xsd:element name="aaa" type="....."> <xsd:element name="bbb" type="....."> <xsd:element name="ccc" type="....."> </xsd:choice> </xsd:complexType>
That mean either element aaa or element bbb or element ccc is filled/exists.
<top> <bbb>myvalue</bbb> </top>
Now I want to copy only this sub-element to a target which currently exists.
<xsl:template match="top"> <xsl:copy-of select="*"/> </xsl:template>
If I simply write:
<xsl:value-of select=".../aaa"/> <xsl:value-of select=".../bbb"/> <xsl:value-of select=".../ccc"/>
then ALL three elements were copied.
The 2 branches which do not exist were created as empty elements so that the target XML doc looks like e.g.
<top> <aaa></aaa> <bbb>myvalue</bbb> <ccc></ccc> </top>
The question is now: How can I let XSL copy only this branch/element which really exists?
I need a function like
<xsl:value-of-only-the-existing-choice-branch select=..../top"/>
<xsl:value-of-if-exists select=".../aaa"/> <xsl:value-of-if-exists select=".../bbb"/> <xsl:value-of-if-exists select=".../ccc"/>
How can I do this in detail?
-- Upcoming: hands-on code list, UBL, XSLT, XQuery and XSL-FO classes in Copenhagen Denmark and Washington DC USA, October/November 2009 Interested in other classes? http://www.CraneSoftwrights.com/s/i/ Crane Softwrights Ltd. http://www.CraneSoftwrights.com/s/ Training tools: Comprehensive interactive XSLT/XPath 1.0/2.0 video Video lesson: http://www.youtube.com/watch?v=PrNjJCh7Ppg&fmt=18 Video overview: http://www.youtube.com/watch?v=VTiodiij6gE&fmt=18 G. Ken Holman mailto:gkholman@xxxxxxxxxxxxxxxxxxxx Male Cancer Awareness Nov'07 http://www.CraneSoftwrights.com/s/bc Legal business disclaimers: http://www.CraneSoftwrights.com/legal
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