Marshalling of restricted dateTime ignores restriction pattern

[teake]

Marshalling of restricted dateTime ignores restriction pattern

[pabigot]

There's no simple way to work around this. The explanation can be found at:

pyxb/pyxb/binding/facets.py

Line 404 in 14737c2

@note: In PyXB, pattern constraints are ignored for any type with

Basically the value has already been converted to a Python dateTime instance at the point where the pattern constraint is checked. That means the original lexical representation has been discarded. So PyXB doesn't validate the document when it's parsed.

PyXB also doesn't attempt to generate lexical representations that are consistent with restrictions, since that's outside the scope of validation (and would be really really hard to do). So the generated representation isn't going to satisfy the restriction either.

It's possible there'd be a way to work around this with a customized binding class but it'd probably be painful.

[teake]

Ok, thanks for the explanation, that's pretty clear.

There's an @todo just below the comment you linked to:

pyxb/pyxb/binding/facets.py

Lines 410 to 412 in 14737c2

	@todo: On creating new instances of non-string simple types from
	string representations, we could apply pattern constraints. That
	would mean checking them prior to invoking the Factory method.

I'm not sure how that squares with you what said above, but if implemented it would make life a bit easier in these situations. But if this @todo is no longer on the roadmap, I think this issue can be closed.

[pabigot]

Given #100 and the fact the @todo was introduced on 2009-09-06 I think we can say it's not on the roadmap. Thanks for using PyXB and for your report. I'll leave it open since it's legitimate and unresolved, but have marked it as unlikely to be worked.