[xml] Post validation

[Steve Ball <Steve Ball zveno com>]

Hi All,

Before I dive in and attempt to (re-)invent the wheel, I'll seek advice 
on how to go about a task that is currently causing me difficulties.

In my library I parse an XML document using the xmlTextReader 
interface.  In some circumstances I then want to validate the document, 
using a call to xmlValidateDocument.  If the document has specified its 
DTD using an external ID (actually a SYSTEM identifier) that is a 
relative URL, validation fails because the relative URL cannot be 
resolved.  This is because xmlValidateDocument calls 
xmlParseDTD(ExternalID, SystemID) but it does not pass a base URI for 
resolving the relative URL.

Starting with the xmlDocPtr for the original document, is there a 
simple way to get the DTD parsed when it is given as a relative URL?  
Or do I need to explicitly parse the external DTD subset before 
invoking xmlValidateDocument?

Any advice greatly appreciated...
Steve Ball

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