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<rp> Ruby Parenthesis
Used to provide spacing and a parenthesis to surround Ruby Text (<rt>), for older systems that do not handle Ruby formatting properly.
Usage/Remarks
This optional element never holds any text except a space, an open parenthesis, or
a close parenthesis:
<ruby> <rb>base text here</rb> <rp>(</rp><rt>annotation</rt><rp>)</rp> </ruby>
Models and Context
May be contained in
Description
Text, numbers, or special characters
Content Model
<!ELEMENT rp (#PCDATA) >