This section is normative for purposes of defining the integration of the Ruby Module into XHTML 2. The semantics of the Ruby Module itself are normatively defined in [RUBY].
This module adds the ruby
element to the
Text content set
of the Text Module.
XHTML 2.0 supports the maximal content model for the ruby element,
defined as follows:
((rb, (rt | (rp, rt, rp))) | (rbc, rtc, rtc?))
As defined in [RUBY], the ruby element is not
allowed to nest.
Implementations: RELAX NG, XML Schema, DTD