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