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Uppercase and lowercase letters are considered distinct: /A and /a are different names The following are examples of valid literal names:
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/Name1 /ASomewhatLongerName /A;Name_With Various***Characters /12 /$$ /@pattern /notdef
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Note: The token / (a slash followed by no regular characters) is a valid name Beginning with PDF 12, any character except null (character code 0) may be included in a name by writing its 2-digit hexadecimal code, preceded by the number sign character (#); see implementation notes 3 and 4 in Appendix H This syntax is required in order to represent any of the delimiter or white-space characters or the number sign character itself; it is recommended but not required for characters whose codes are outside the range 33 (!) to 126 (~) The examples shown in Table 33 are valid literal names in PDF 12 and higher
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TABLE 33 Examples of literal names using the # character
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LITERAL NAME RESUL T
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/Adobe#20Green /PANTONE#205757#20CV /paired#28#29parentheses /The_Key_of_F#23_Minor /A#42
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The length of a name is subject to an implementation limit; see Appendix C The limit applies to the number of characters in the name s internal representation For example, the name /A#20B has four characters (/, A, space, B), not six As stated above, name objects are treated as atomic symbols within a PDF le Ordinarily, the bytes making up the name are never treated as text to be presented to a human user or to an application external to a PDF viewer However, occa-
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sionally the need arises to treat a name object as text, such as one that represents a font name (see the BaseFont entry in Table 58 on page 317) or a structure type (see Section 962, Structure Types ) In such situations, it is recommended that the sequence of bytes (after expansion of # sequences, if any) be interpreted according to UTF-8, a variable-length byteencoded representation of Unicode in which the printable ASCII characters have the same representations as in ASCII This enables a name object to represent text in any natural language, subject to the implementation limit on the length of a name (See implementation note 5 in Appendix H) Note: PDF does not prescribe what UTF-8 sequence to choose for representing any given piece of externally speci ed text as a name object In some cases, there are multiple UTF-8 sequences that could represent the same logical text Name objects de ned by different sequences of bytes constitute distinct name objects in PDF, even though the UTF-8 sequences might have identical external interpretations In PDF, name objects always begin with the slash character (/), unlike keywords such as true, false, and obj This book follows a typographic convention of writing names without the leading slash when they appear in running text and tables For example, Type and FullScreen denote names that would actually be written in a PDF le (and in code examples in this book) as /Type and /FullScreen
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An array object is a one-dimensional collection of objects arranged sequentially Unlike arrays in many other computer languages, PDF arrays may be heterogeneous; that is, an array s elements may be any combination of numbers, strings, dictionaries, or any other objects, including other arrays The number of elements in an array is subject to an implementation limit; see Appendix C An array is written as a sequence of objects enclosed in square brackets ([ and ]):
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[549 314 false (Ralph) /SomeName]
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PDF directly supports only one-dimensional arrays Arrays of higher dimension can be constructed by using arrays as elements of arrays, nested to any depth
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326 Dictionary Objects
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A dictionary object is an associative table containing pairs of objects, known as the dictionary s entries The rst element of each entry is the key and the second element is the value The key must be a name (unlike dictionary keys in PostScript, which may be objects of any type) The value can be any kind of object, including another dictionary A dictionary entry whose value is null (see Section 328, The Null Object ) is equivalent to an absent entry (Note that this differs from PostScript, where null behaves like any other object as the value of a dictionary entry) The number of entries in a dictionary is subject to an implementation limit; see Appendix C Note: No two entries in the same dictionary should have the same key If a key does appear more than once, its value is unde ned A dictionary is written as a sequence of key-value pairs enclosed in double angle brackets (<< >>) For example:
<< /Type /Example /Subtype /DictionaryExample /Version 001 /IntegerItem 12 /StringItem (a string) /Subdictionary << /Item1 04 /Item2 true /LastItem (not!) /VeryLastItem (OK) >> >>
Note: Do not confuse the double angle brackets with single angle brackets (< and >), which delimit a hexadecimal string (see Hexadecimal Strings on page 32) Dictionary objects are the main building blocks of a PDF document They are commonly used to collect and tie together the attributes of a complex object, such as a font or a page of the document, with each entry in the dictionary specifying the name and value of an attribute By convention, the Type entry of such a dictionary identi es the type of object the dictionary describes In some cases, a Subtype entry (sometimes abbreviated S) is used to further identify a specialized subcategory of the general type The value of the Type or Subtype entry is always