EZP-26976: Add RichText xhtml5 support for thead & tfoot

[andrerom]

Issue: https://jira.ez.no/browse/EZP-26976

Related to PlatformUI fix: ezsystems/PlatformUIBundle#817

"BC":

• This changes xhtml5 edit & ouput formats to always return tbody in tables, and optionally also thead/tfoot if present.

Todo:

• Could need some help to figure out how to fix docbook ezpublish.rng validation for thead / tfoot (error is cryptic, refers to completely other tags, but it only shows up when those two are added in the docbook document)

[alongosz]

Fixed docbook.rng (used by ezpublish.rng) in 733eac6. RelaxNG Schema required tfoot being placed before tbody. In HTML5 it's not a requirement, so I surrounded proper validation XML with interleave which allows elements to occur in any order.

[pspanja]

@alongosz docbook.rng is the original unmodified Docbook schema from the release. It should not be modified directly, but only through ezpublish.rng. Readme file mentions it's the original, but maybe it should also be explicit about not modifying it.

[pspanja]

More info about it here: http://tdg.docbook.org/tdg/5.1/ch05.html

[alongosz]

Readme file mentions it's the original, but maybe it should also be explicit about not modifying it.

Not really, should be obvious to everyone, my bad... :)

So, reverted it and redefined db.html.informaltable.model in ezpublish.rng with proper changes (788a8a2). Hope now this is how it should be done @pspanja

Note: I also rebased branch against master to get rid of php-cs-fixer error.

[andrerom]

👍

@pspanja looks ok to you to?
review ping @Nattfarinn

[andrerom]

Rebased, looks ok @alongosz ?

[alongosz]

Looks good :)