Re: [gdome]MathML DOM implementation: I need some advise

["Pierre-Paul Delisle" <pierrep_delisle hotmail com>]

Hi,

> as I said you should be able to implement it without knowing Gdome2
> internals if we assume for instance that upcasting from a MathML element
> to a DOM element is done via an explicit method call and not simply a C
> cast. This is quite reasonable after all since C has no knowledge of
> what upcasting really is...
I will follow this. But I cannot hide the fact that the Gdome2 code will
inspire me.

> For the automatic generation, most of the IDL attributes in MathML DOM
> interfaces correspond to XML attributes, so all the code to get/set
> their value can be generated. Also, the list of parameters, the
> correspondence of IDL types with C types, the extra methods provided by
> every implementation (such as the up/down casts, constructors and
> similar others), can be generated with great benefit for future
> maintenance.
I will have a big stylesheet at the end ... ;)

> In gmetadom we're doing this for generating the bindings directly from
> the XML encoding of the W3C spec for DOM. I assume the MathML spec also
> has a similar XML encoding. From there, it is quite easy to write XSLT
> stylesheets that generate real code. You can have a look at gmetadom
> sources for examples of such stylesheets. In your case however, you
> wouldn't be able to generate ALL the code: at most you'll be able to
> generate prototypes and methods with an empty body to be filled by hand.
> Or, you can provide the method bodies and any other missing information
> in a separate set of XML files and combine them with the XML files for
> MathML DOM. You can see an example of this technique in gmetadom again
> (Ocaml binding), where we keep a parallel set of XML files to know which
> arguments can be "nullable", that is which parameters can accept a NULL
> value. This is an example of missing information that cannot be inferred
> safely from the spec.
I will reuse the stuff from gmetadom-0.2.0/src/gdome_caml/xsl/xml2c.xsl
and use as input the mathml-dom.xml coming with the MathML2 specification.

> If you're interested in going this way feel free to ask for more
> information.
You're giving me great information. Thanks a lot!

 Pierre-Paul

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