2.2.1 [Ruby:2001] Section 2.2, The ruby element

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C0001:

The specification states:

 The ruby element is an inline (or text-level) element that serves as an overall 
 container. It contains either the rb, rt and optional rp elements (simple ruby 
 markup) or the rbc and rtc elements (complex ruby markup).

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The dir attribute is not supported in simple or complex ruby elements.