[xsd-users] Re: xinclude

[Boris Kolpackov]

Frederic,

frederic heem <frederic.heem at telsey.it> writes:

> I would like to use Xinclude inside an xml instance file, is it
> possible to do it with xsd ?

xsd does not provide any special handling for XInclude so you
will have to handle it yourself. One approach to this problem
is to define a 'choice' between an in-line element content
and an inclusion from a separate instance document:


<complexType name="Foo">

 ...

</complexType>


<complexType name="Bar">
  <choice>
    <element name="foo" type="Foo"/>
    <element name="include-foo" type="anyURI"/>
  </choice>
</complexType>


<element name="foo" type="Foo"/>
<element name="bar" type="Bar"/>


Having this structure, in your application you can handle
include-foo by parsing the separate instance document and
using the result to "fix" the tree, e.g.,


Bar& bar = ...

if (bar.include_foo ())
{
  // Parse the included document.
  //
  auto_ptr<Foo> f (foo (*bar.include_foo ()));

  // Copy the result into the original tree.
  //
  bar.foo (f);
}


This way the rest of your application logic does not have to worry
about the inclusion and can just assume that foo is always set.


hth,
-boris
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