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ACTION ITEM: draft general section about extending/customizing schemas (http://www.w3.org/International/its/track/actions/1)

From: Lieske, Christian <christian.lieske@sap.com>
Date: Thu, 30 Aug 2007 08:38:37 +0200
Message-ID: <544FBEB6875DAA46A08323B58D26B80102314853@dewdfe14.wdf.sap.corp>
To: <public-i18n-its@w3.org>
Hi there,

Here's my suggestion. I guess a good place for the text would be the end of
the overview of the best practices for developers (ie. just before BP 1).
Possibly we may want to go for a sub-heading like "General Remarks on
Adapting Schemas".

Thanks to Felix for his input to this.


The "How to do this" parts of this document often contain statements related
to schema creation or modification. The statements pertain to one of the
following state-of-affairs:

1. creating a schema from scratch
2. modifying an existing schema 

The following aspects may need to be taken into account when working on both
of these topics:

1. Think twice before creating your own schema. Consider strongly existing
formats such as DITA, DocBook, OpenOffice, XUL, UBL, ... Those formats have
many insights 'built-in'.

2. The mechanisms which you can or have to use depend on the schema
language (DTD, XSD, RelaxNG, ...). Namespace-based modularization of schemas
for example is hard to realize for DTDs.

3. Very often each schema formalism provides several possibilities related
to modification. XSD for example provides statements such as "import",
"include", or "redefine" as well as mechanisms such as type

4. What's possible also depends on the features of the schema which the
modification is targeting. Examples:

- An XSD "redefine" for example only is only
possible if the modified schema has been created with named types.

- If you are working with XSD, your options depend on the question whether
the schemas involved define target namespaces (techniques such as working
"chameleon" or "proxy" schemas may be considered as solutions in certain

5. The format itself should be carefully
checked with regard to modification capabilities. DocBook and DITA for
example come with their own set of features for adapting them to a special
Christian Lieske
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Received on Thursday, 30 August 2007 06:38:51 UTC

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