[xsd-users] Accessing the xml:base attribute using cxx-parser.

[Jeroen N. Witmond [Bahco]]

Hi Boris,

Boris Kolpackov <boris at codesynthesis.com> writes:
> Jeroen N. Witmond [Bahco] <jnw at xs4all.nl> writes:
>
>> As a companion to my webpage about accessing the xml:base attribute
>> using
>> cxx-tree [1] I have created a new page about doing the same with
>> cxx-parser.
>>
>> http://www.xs4all.nl/~jnw/codesynthesis/xmlnamespace/parser.html
>
> Nice. I've added this link to the C++/Parser page in the wiki:
>
> http://wiki.codesynthesis.com/Parser

Thanks.

>> Having completed this, I wonder why the C++/Parser Mapping Getting
>> Started
>> Guide [2] does not open with a reference to cxx-parser options
>> --generate-print-impl and --generate-test-driver. I was very pleased
>> when
>> I found out about them before having written any code. :)
>
> We were afraid some people may think of this as a blatant self-
> promotion ;-). Seriously though, these options are discussed in
> Section 2.3 of the "Hello World" chapter, as soon as the reader
> has an idea what the C++/Parser mapping is about.

Oops, my bad. :) I'm not a sequential reader. The 'generated' example was
an eye-opener for me.

>> I also wonder if I have missed any magic to do with cxx-parser what the
>> customization of anyType achieves for cxx-tree.
>
> There are a couple of ways to save typing, especially if you have a
> lot of parsers that need to handle xml:* attributes. Both ways use
> C++ mixin idiom to add xml:base attribute parsing to other parsers.
>
> The first example[1] provides implementation of the _any_attribute()
> function as a mixin. It is based on and is very similar to your
> parser-wildcard example.
>
> The second example[2] uses the low-level _attribute() callback to
> intercept all attributes. It then handles xml:base itself and
> delegates parsing of other attributes to the original implementation.
> One advantage of this approach is that it will support xml:base
> even if the schema does not allow it (provided you have disabled
> validation in the underlying XML parser or is using validation in
> the generated code).
>
> [1] http://codesynthesis.com/~boris/tmp/lax-pimpl-any-mixin.hpp
> [2] http://codesynthesis.com/~boris/tmp/lax-pimpl-intercept-mixin.hpp

Wow! I've downloaded and read them, and they are just the magic I need. I
had seen the 'multiroot' example, but I the penny did not drop. :) Do I
have your permisssion to add your examples and your descriptions to my
webpage?

Regards,

Jeroen.