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FIGURE 35 Inheritance of attributes
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363 Name Dictionary
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Some categories of objects in a PDF le can be referred to by name rather than by object reference The correspondence between names and objects is established by the document s name dictionary (PDF 12), located via the Names entry in the document s catalog (see Section 361, Document Catalog ) Each entry in this dictionary designates the root of a name tree (Section 384, Name Trees ) de ning names for a particular category of objects Table 319 shows the contents of the name dictionary
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37 Content Streams and Resources
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Content streams are the primary means for describing the appearance of pages and other graphical elements A content stream depends on information contained in an associated resource dictionary; in combination, these two objects form a self-contained entity This section describes these objects
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TABLE 319 Entries in the name dictionary
KEY TYPE VALUE
Dests AP JavaScript Pages Templates IDS URLS EmbeddedFiles
name tree name tree name tree name tree name tree name tree name tree name tree
(Optional; PDF 12) A name tree mapping name strings to destinations (see Named Destinations on page 476) (Optional; PDF 13) A name tree mapping name strings to annotation appearance streams (see Section 844, Appearance Streams ) (Optional; PDF 13) A name tree mapping name strings to document-level JavaScript actions (see JavaScript Actions on page 556) (Optional; PDF 13) A name tree mapping name strings to visible pages for use in interactive forms (see Section 865, Named Pages ) (Optional; PDF 13) A name tree mapping name strings to invisible (template) pages for use in interactive forms (see Section 865, Named Pages ) (Optional; PDF 13) A name tree mapping digital identi ers to Web Capture content sets (see Section 993, Content Sets ) (Optional; PDF 13) A name tree mapping uniform resource locators (URLs) to Web Capture content sets (see Section 993, Content Sets ) (Optional; PDF 14) A name tree mapping name strings to embedded le streams (see Section 3103, Embedded File Streams )
371 Content Streams
A content stream is a PDF stream object whose data consists of a sequence of instructions describing the graphical elements to be painted on a page The instructions are represented in the form of PDF objects, using the same object syntax as in the rest of the PDF document However, whereas the document as a whole is a static, random-access data structure, the objects in the content stream are intended to be interpreted and acted upon sequentially Each page of a document is represented by one or more content streams Content streams are also used to package up sequences of instructions as self-contained graphical elements, such as forms (see Section 49, Form XObjects ), patterns (Section 46, Patterns ), certain fonts (Section 554, Type 3 Fonts ), and annotation appearances (Section 844, Appearance Streams )
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A content stream, after decoding with any speci ed lters, is interpreted according to the PDF syntax rules described in Section 31, Lexical Conventions It consists of PDF objects denoting operands and operators The operands needed by an operator precede it in the stream See Example 33 on page 43 for an example of a content stream An operand is a direct object belonging to any of the basic PDF data types except a stream Dictionaries are permitted as operands only by certain speci c operators Indirect objects and object references are not permitted at all An operator is a PDF keyword that speci es some action to be performed, such as painting a graphical shape on the page An operator keyword is distinguished from a name object by the absence of an initial slash character (/ ) Operators are meaningful only inside a content stream Note: This post x notation, in which an operator is preceded by its operands, is super cially the same as in the PostScript language However, PDF has no concept of an operand stack as PostScript has In PDF, all of the operands needed by an operator must immediately precede that operator Operators do not return results, and there may not be operands left over when an operator nishes execution Most operators have to do with painting graphical elements on the page or with specifying parameters that affect subsequent painting operations The individual operators are described in the chapters devoted to their functions:
4 describes operators that paint general graphics, such as lled areas,