* Sebastian Rahtz
|
| ie it does not pick up the external file.
| 
| I had a vague idea that one had to read the DTD subset? It is just
| optional, is it? in which case shouldn't &data1; be an error?

Parsers have to read the internal subset, at least up to the first
external parameter entity reference they do not process. 

However, non-validating parsers are not required to parse external
entities. 

<URL: http://www.w3.org/TR/REC-xml#entproc >, especially
<URL: http://www.w3.org/TR/REC-xml#include-if-valid >

So the document, and Sablotron's treatment of it, are both legal.
However, a good XSLT engine _should_ include external entities.

--Lars M.


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