Re: [relax-ng] Including a schema more than once without causing errors

["MURATA Makoto (FAMILY Given)" <eb2m-mrt@asahi-net.or.jp>]

> If you guard an include, what is the condition variable? The C example 
> checks H_GRANDFATHER.
> The RNC has the string "http://www.example.com/grandfather";. So it is 
> either the interpretation of that string as a URI - I'm not sure how 
> that differs from the #pragma_once case of XML Schema - or all the 
> content retrieved from the URI.

Completely different.  The point is that different URIs may refer to 
the same schema.  On the other hand, "http://www.example.com/grandfather";
is different from everything else.

> 
> One area that the include guard breaks down is when files are compiled 
> separately with poor organization of the makefile dependencies.  Then 
> H_GRANDFATHER and its structures, and more importantly static objects, 
> can be included multiple times in a series of intermediate object files. 
> I think the guard only works when there is but one, and only one, 
> compilation context.  Would RELAX NG validators face a similar situation?

I do not understand your point.  C or C++ programmers have safely used #ifdef 
for more than one compliation context.  Are they any examples of
failures?

-- 
MURATA Makoto (FAMILY Given) <EB2M-MRT@asahi-net.or.jp>