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                                                     911
          SECTION 10.7                                                                   Tagged PDF




             TABLE 10.26 Standard structure types for Ruby and Warichu elements (PDF 1.5)
STRUCTURE TYPE      DESCRIPTION

Ruby                (Ruby) The wrapper around the entire ruby assembly. It contains one RB element followed
                    by either an RT element or a three-element group consisting of RP, RT, and RP. Ruby ele-
                    ments and their content elements may not break across multiple lines.

RB                  (Ruby base text) The full-size text to which the ruby annotation is applied. RB can contain
                    text, other inline elements, or a mixture of both. It may have the RubyAlign attribute.

RT                  (Ruby annotation text) The smaller-size text that is placed adjacent to the ruby base text. It
                    can contain text, other inline elements, or a mixture of both. It may have the RubyAlign
                    and RubyPosition attributes.

RP                  (Ruby punctuation) Punctuation surrounding the ruby annotation text. It us used only
                    when a ruby annotation cannot be properly formatted in a ruby style and instead is for-
                    matted as a normal comment, or when it is formatted as a warichu. It contains text (usual-
                    ly a single open or close parenthesis or similar bracketing character).

Warichu             (Warichu) The wrapper around the entire warichu assembly. It may contain a three-ele-
                    ment group consisting of WP, WT, and WP. Warichu elements (and their content elements)
                    may wrap across multiple lines, according to the warichu breaking rules described in the
                    Japanese Industrial Standard (JIS) X 4051-1995.

WT                  (Warichu text) The smaller-size text of a warichu comment that is formatted into two lines
                    and placed between surrounding WP elements.

WP                  (Warichu punctuation) The punctuation that surrounds the WT text. It contains text (usu-
                    ally a single open or close parenthesis or similar bracketing character). According to JIS X
                    4051-1995, the parentheses surrounding a warichu may be converted to a space (nominal-
                    ly 1/4 EM in width) at the discretion of the formatter.


          Illustration Elements

          Tagged PDF defines an illustration element as any structure element whose struc-
          ture type (after role mapping, if any) is one of those listed in Table 10.27. The il-
          lustration’s content must consist of one or more complete graphics objects. It may
          not appear between the BT and ET operators delimiting a text object (see Section
          5.3, “Text Objects”). It may include clipping only in the form of a contained
          marked clipping sequence, as defined in Section 10.5.2, “Marked Content and
          Clipping.” In Tagged PDF, all such marked clipping sequences must carry the
          marked-content tag Clip.

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