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On Tue, 25 Oct 2005, Dmitry Epstein wrote:
>> Theoretically, I think this could do the trick:
>>
>> (1) Include the XML document that contains IDs into the document that
>> refers to them via a parsed external entity [XML Rec, 4.2.2, 4.3]
>>
>> (2) Use WXS key/keyref feature [WXS, Part 1, 3.11] to encode your
>> referential constraints.
>>
>> (1) will physically keep the data in separate files, but the processor
>> should pull them together, so the schema (2) could be written as if the
>> data was present in a single file.
>
> Let me see if I understand. The external entity could look like this:
>
> <item id="abc123"/>
> <item id="def456"/>
> ...
>
> Then in some other XML document the DTD will include these lines:
>
> <!ATTLIST item id ID #REQUIRED>
> <!ENTITY itemlist SYSTEM "itemlist.xml">
No need for the ATTLIST declaration, this constraint will be in your
schema.
> and later in the body of the document:
>
> <items>&itemlist;</items>
>
> Something like this?
>
> But if I am already using a DTD to describe my document, can I use a schema
> as well?
As Rick says, this will depend on the tool. Since in this approach you
need only the entity inclusion feature of DTDs, there is some hope that
your schema-validating parser can do that...
VG
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