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> 1. Checking content (strings particularly) against different types
> of element attribute. For example how would the following be
> done in current schemas so that invalid cases were trapped?
>
> <AttribContext>
> <!-- Valid -->
> <Var Type="fixed">1234</Var>
> <Var Type="float">3.14159</Var>
> <Var Type="hex">345ABCH</Var>
> <Var Type="hex">03fe5a6H</Var>
> <!-- Invalid -->
> <Var Type="hex">34V56H</Var>
> <Var Type="hex">abcdh</Var>
> <Var Type="hex">2adef</Var>
> <Var Type="fixed">2a1217</Var>
> <Var Type="fixed">2+1217</Var>
> <Var Type="float">32.8.7</Var>
> <Var Type="fixed">2.1217</Var>
> </AttribContext>
In RELAX NG, you can do it like this:
datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes";
element AttribContext {
element Var {
(attribute Type { "fixed" }, xsd:integer)
| (attribute Type { "float" }, xsd:float)
| (attribute Type { "hex" }, xsd:token { pattern = "[0-9a-fA-F]+H" })
}*
}
(This is using the non-XML syntax:
http://www.thaiopensource.com/relaxng/nonxml/)
> 2. The other and, I believe more critical, problem was the challenge
> I gave to Nis Klarlundis and described on the DSD site at
> http://www.research.att.com/projects/DSD/generic-lists/. I still
> do not believe that this challenge has been successfully answered
> in any other schema (except possibly the Schematron which I consider
> to be a validation rather than a definition language).
That particular document can be handled straightforwardly by this:
element person {
element surname { text },
element forenames {
element oList {
element listItem { element name { text } }*
}
},
element webbs {
element oList {
element listItem { element qualification { text } }*
}
}
}
If you want to do this as modification to a generic ordered list schema, you
can also do that. Here's the list schema:
start = element oList { element listItem { itemContent }* }
and here's a person schema that uses it:
element person {
element surname { text },
element forenames {
grammar {
include "list.rng"
itemContent = element name { text }
}
},
element webbs {
grammar {
include "list.rng"
itemContent = element qualification { text }
}
}
}
James
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