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Re: How to copy only the really existing <choice> bra
Subject: Re: How to copy only the really existing <choice> branch/element? "value-of-if-exist"
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Wed, 07 Oct 2009 14:18:51 +0200
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Ben Stover wrote:
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.
Now I want to copy only this sub-element to a target which currently exists.
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>
which is an invalid XML because of its XSD schema file definition.
xsl:value-of never creates an elements at all thus I don't see how
<xsl:value-of select="ccc"/> would create any element at all in the output.
So somehow I am not sure which problem you face, if there is e.g. no
'ccc' element in the input then neither
<xsl:value-of select="ccc"/>
nor
<xsl:copy-of select="ccc"/>
will output any element.
--
Martin Honnen
http://msmvps.com/blogs/martin_honnen/
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