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Extending an existing XML format


I want to design an XML format for my application. Documents using
this format will describe LDAP classes and attributes. I have found
the DSML format ( http://xml.coverpages.org/dsmlv1.html ) which does a
part of what I want.

But I want to add some information to it. For example, with DSML I can
write :

<dsml:description>Some description</dsml:description>

And I need more information, like :

<dsml:description>Some description</dsml:description>

What are the best practices to extend an existing XML format ? If I
add some elements, will the document still respect the original
schema ?

DSML use xmlns:dsml="http://www.dsml.org/DSML" (don't try this uri, it
is broken)

if I write my namespace, can I refer to the DSML namespace ? Same
question for a XML Schema.

I read the XML docs but did not understand everything. I searched the
web without success. If there are some examples you can just show me.

Thank you very much


May 18 '07 #1
1 1619
Schemas can be allow themselves to be extended via extension/restriction
of complex types; see the Schema Structures document for a discussion of
how to do this. (Look for discussion of "derivation" and "derived types")


However, schemas can also impose limits on derivation, so whether you
can create a derived type that adds the fields you want will depend on
how the original schema was written. Read that schema, or try it and see
if it works.
if I write my namespace, can I refer to the DSML namespace ? Same
question for a XML Schema.
Schemas can refer to things defined by other schema documents.

Namespaces don't "refer to" anything; they are only a way to manage the
names of things so we don't wind up with conflicting definitions of the
same element or attribute.

() ASCII Ribbon Campaign | Joe Kesselman
/\ Stamp out HTML e-mail! | System architexture and kinetic poetry
May 19 '07 #2

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