Extension points

I had an action item to come up with an initial list of extension points.

Here is an initial proposal:


--- For elements:

I propose to allow element extension point at the following locations:

- In <file> just before the first <unit>.
- In <unit> just before the element's closing tag.
- In <segment> just before the element's closing tag.
- In <ignorable> just before the element's closing tag.

This happens to match what Rodolfo defined for <metadata> so far. I think this make sense, as it's logical to allow both <metadata> and custom namespaces at the same locations since both are extension mechanisms.

- In addition we already have an element extension point in <skeleton> (and no <metadata> there, which also make sense).


--- For attributes:

I propose to allow extension points for the following elements:

In <xliff>, <file>, <unit>, <segment>, <ignorable>, <source> and <target>.
As well as in <match> in the Matches module.


I have also an action item to do about the processing expectations, that'll come later.

Cheers,
-yves