simple types in PAGE model are broken

[bertsky]

This is a regression from #437:

>>> regions[0].get_type()
'page-number'
>>> isinstance(regions[0].get_type(), str)
True
>>> isinstance(TextTypeSimpleType.PAGENUMBER, str)
False
>>> TextTypeSimpleType.PAGENUMBER == 'page-number'
False
>>> regions[0].set_type(TextTypeSimpleType.PAGENUMBER)
>>> regions[0].get_type()
<TextTypeSimpleType.PAGENUMBER: 'page-number'>
>>> str(TextTypeSimpleType.PAGENUMBER)
'TextTypeSimpleType.PAGENUMBER'

The latter is also what is used for XML serialization. This in turn causes invalid PAGE output when using ocrd-tesserocr-segment-region, which afterwards even without validation causes tons of error messages of the following form:

Warning: Value "TextTypeSimpleType.HEADING" near line 56 does not match xsd enumeration restriction on TextTypeSimpleType

This is super-urgent. I recommend doing a revert release first and then start proper investigation.

[bertsky]

@kba can you please revert 3a0a3a8 from #437 and make a new release, so we at least have a working master?

[kba]

3a0a3a8 reverted as a quickfix in v2.4.3. That reopens the issue with @conf but you're mitigating that already so this is the least worst solution. Will need to revisit to properly fix and not introduce more regressions.

[bertsky]

3a0a3a8 reverted as a quickfix in v2.4.3. That reopens the issue with @conf but you're mitigating that already so this is the least worst solution. Will need to revisit to properly fix and not introduce more regressions.

19afb8d is not a true revert of 3a0a3a8, and it does not fix this unfortunately!

The reason seems to be that you ran generateds with the bad new (instead of the good old) version again: this shows no difference other than the date (version and code stay the same), whereas that was the change we want/need to revert.