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Re: checking if an attribute exists
- To: xsl-list at lists dot mulberrytech dot com
- Subject: Re: [xsl] checking if an attribute exists
- From: Oskar Werewka <ow5 at poczta dot onet dot pl>
- Date: Mon, 11 Jun 2001 20:36:09 +0200
- References: <5.1.0.14.0.20010611174348.023ca6d0@pop3.poczta.onet.pl>
- Reply-To: xsl-list at lists dot mulberrytech dot com
Thank you. It is working now.
> > This i very simple question:
> >
> > <element attribute="...">Value</element>
> >
> > How can I check if the "attribute" attribute is defined?
>
>I'll use the following as an example because it will be easier to discuss
>(i.e. I won't have to talk about the element element or the attribute
>attribute):
>
><car color="...">Value</car>
>
>If you want to know whether a given car element has a color attribute set,
>then <xsl:if test="@color"></xsl:if> in a template rule for car will check
>for this.
I was fighting test="@color" for one hour, but I was in a wrong node ;->
>If, on the other hand, by "defined" you mean that you want to check whether
>color was declared as an attribute for the car element, you can't, because
>attribute list declarations happen in the DTD, and an XSLT processor has no
>way of knowing what's in the DTD.
>
>The input to an XSLT processor is an in-memory representation of a document
>known as a source tree that was constructed with the help of an XML parser.
>This parser may have looked at the DTD, but once the source tree is created,
>the parser's job is done, and the XSLT processor has no way of knowing what
>effect a DTD may have had on the tree's construction.
>
>Bob DuCharme www.snee.com/bob <bob@
>snee.com> see http://www.snee.com/bob/xsltquickly for
>info on new book "XSLT Quickly" from Manning Publications.
>
>
>
> XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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