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Annotations associated with a page are not interleaved within the page s content stream, but are placed in the Annots array in its page object (see Page Objects on page 87) Consequently, the correct position of an annotation in the page content order is not readily apparent, but is determined from the document s logical structure Both page content (marked-content sequences) and annotations can be treated as content items that are referenced from structure elements (see Section 963, Structure Content ) Structure elements of type Link or Form (see Inline-Level Structure Elements on page 632 and Illustration Elements on page 637) explicitly specify the association between a marked-content sequence and a corresponding annotation In other cases, if the structure element corresponding to an annotation immediately precedes or follows (in the logical structure order) a structure element corresponding to a marked-content sequence, the annotation
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is considered to precede or follow the marked-content sequence, respectively, in the page content order Note: If necessary, a Tagged PDF producer may introduce an empty marked-content sequence solely to serve as a structure element for the purpose of positioning adjacent annotations in the page content order
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Reverse-Order Show Strings
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In writing systems that are read from right to left (such as Arabic or Hebrew), one might expect that the glyphs in a font would have their origins at the lower right and their widths (rightward horizontal displacements) speci ed as negative For various technical and historical reasons, however, many such fonts follow the same conventions as those designed for Western writing systems, with glyph origins at the lower left and positive widths, as shown in Figure 54 on page 298 Consequently, showing text in such right-to-left writing systems requires either positioning each glyph individually (which is tedious and costly) or representing text with show strings whose characters are given in reverse order When the latter method is used, the characters correct page content order is the reverse of their order within the show string The marked-content tag ReversedChars informs the Tagged PDF consumer application that show strings within a marked-content sequence contain characters in the reverse of page content order If the sequence encompasses multiple show strings, only the individual characters within each string are reversed; the strings themselves are in natural reading order For example, the sequence
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/ReversedChars BMC ( olleH) Tj 200 0 Td (dlrow) Tj EMC
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represents the text
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The show strings may have a space character at the beginning or end to indicate a word break (see Identifying Word Breaks on page 622), but may not contain
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interior spaces This is not a serious limitation, since a space provides an opportunity to realign the typography without visible effect; and it serves the valuable purpose of limiting the scope of reversals for word-processing consumer applications
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Character codes in a Tagged PDF document can be unambiguously converted into Unicode values representing the information content of the text, and some characteristics of the associated fonts can be deduced These Unicode values and font characteristics can then be used for such operations as cut-and-paste editing, searching, text-to-speech conversion, and exporting to other applications or le formats
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Every character code in a Tagged PDF document can be mapped to a corresponding Unicode value Unicode de nes 16-bit values for most of the characters used in the world s languages and writing systems, as well as providing a vendor space that applications can use as a private escape area Information about Unicode can be found in the Unicode Standard, by the Unicode Consortium (see the Bibliography) The methods for mapping a character code to a Unicode value are as follows:
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If the font dictionary contains a ToUnicode CMap (see Section 59, ToUnicode
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CMaps ), use that CMap to convert the character code to Unicode
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If the font is a simple font that uses one of the prede ned encodings
MacRomanEncoding, MacExpertEncoding, or WinAnsiEncoding, or that has an encoding whose Differences array includes only character names taken from
the Adobe standard Latin character set and the set of named characters in the Symbol font (see Appendix D): 1 Map the character code to a character name according to Table D1 on page 710 and the font s Differences array 2 Look up the character name in the Adobe Glyph List (see the Bibliography) to obtain the corresponding Unicode value