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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Schema constraints from a different file?
 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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