Unplugged & Install-Friendly XML

[Richard Tobin]

> If one were building a product which used XML to write out 
> metadata about things, what is the recommended approach 
> to referring to a product-specific DTD in your XML 
> document instances given the fact that [...]

You could refer to the DTD by means of a public id which is known to
the application.  Other XML processors that don't understand that
public id will use the URL instead.

For example:

 <!DOCTYPE mydoc PUBLIC "-//MyCompany//My product//EN" 
                        "http://my.company.com/myproduct.dtd">

Your application would recognise the id "-//MyCompany//My product//EN"
and supply a built-in DTD instead of fetching the URL.

Perhaps someone else could give better guidance on just how to construct
a suitable public id.

-- Richard

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