[xml] xmlTextReaderSetSchema and dynamic setting of the schema

["David D. Hagood" <wowbagger sktc net>]

I'd like to check my understanding:

According to the documentation, if you want to have an xmlTextReader do 
schema validation, you have to set the schema before the first read call 
on the text reader.

HOWEVER, if you are trying to make a reader routine which can handle 
multiple document types, you don't know the doc type until you've read 
the DOCTYPE element, which you don't know until you've done a Read on 
the Reader - which makes it too late to activate a schema.

So as I read it, there is no way to read the first 2 lines of a stream 
(which may not be seekable), deduce the schema needed from the DOCTYPE 
record, then activate the appropriate schema.

Is this a correct assessment?