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At 2004-04-13 16:41 -0400, Engel, Phillip wrote:
>I am looking for some help on the correct interpretation of the
>generate-id() function with multiple source documents.
XSLT and XPath questions would be better posted to the following list:
http://www.mulberrytech.com/xsl/xsl-list
There are a number of subscribers who would enthusiastically respond to
such questions.
There is also an *excellent* FAQ at:
http://www.dpawson.co.uk
>I am writing an xslt style sheet that combines multiple input documents into
>one output document. The original source document has references to other
>documents which in turn may have more references to more documents.
>Basically, it is a chain of href attributes. As part of the process I use
>the generate-id() function on the root of each input document and keep it on
>a stack so I can keep track of which documents have been processed. So in
>the code I have something like:
>
><value-of select="generate-id(document($nextDocument))"/>
>
>I've run this style sheet with saxon and msxml4 and have had no problems.
>However, when I run this using dot net (xsltransform.transform), I've
>discovered that this statement generates the same id for the root nodes of
>all input documents. So if I have:
>
><value-of select="generate-id(document('x.xml'))"/>
><value-of select="generate-id(document('y.xml'))"/>
>
>Both of these statements generate the same id using dot net, but different
>ids using saxon and msxml4.
>
>The xslt spec says that the generate-id() fucntion should generate a unique
>id for every node. To me, since the root node of one document is a
>different node than the root of another document, I should get different
>ids.
Yes, you should get a different identifier value for every root node.
>It should not matter that the nodes are in difference source
>documents.
Because they are in different source documents, their root nodes should
have different generated identifier values.
>Is this a correct interpretation of the spec?
Your supposition and Saxon and msxml4 are correct ... if your evidence
rings true then dot net is not functioning according to the specification.
>I appreciate any thoughts.
First, I'm not sure why you are trying to keep track of the document root
nodes ... if you access a document more than once the processor will have
(should have) already cached it. Also, two accesses to the generated
identifier in a single run of a stylesheet are required to return the same
value, so there is no harm looking at the same node twice. Why go through
the effort of maintaining a stack of visited documents?
When I teach aggregation using XSLT all of the ID/IDREF problems are solved
by constructing the result tree nodes along the lines of:
id="{generate-id(.)}"
and
idref="{generate-id(id(@idref))}"
This is important when aggregating hyperlinks within several documents
being aggregated into a single XSL-FO result and having the links work in
the result.
I hope this helps.
...................... Ken
--
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