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Marked Content
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95 Marked Content
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Marked-content operators (PDF 12) identify a portion of a PDF content stream as a marked-content element of interest to a particular application or PDF plug-in extension Marked-content elements and the operators that mark them fall into two categories:
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The MP and DP operators designate a single marked-content point in the content stream
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The BMC, BDC, and EMC operators bracket a marked-content sequence of objects within the content stream Note that this is not simply a sequence of bytes in the content stream, but of complete graphics objects Each object is fully quali ed by the parameters of the graphics state in which it is rendered A graphics application, for example, might use marked content to identify a set of related objects as a group to be processed as a single unit A text-processing application might use it to maintain a connection between a footnote marker in the body of a document and the corresponding footnote text at the bottom of the page Table 98 summarizes the marked-content operators All marked-content operators except EMC take a tag operand indicating the role or signi cance of the marked-content element to the processing application All such tags must be registered with Adobe Systems (see Appendix E) to avoid con icts between different applications marking the same content stream In addition to the tag operand, the DP and BDC operators specify a property list containing further information associated with the marked content Property lists are discussed further in Section 951, Property Lists Marked-content operators may appear only between graphics objects in the content stream; they may not occur within a graphics object or between a graphics state operator and its operands Marked-content sequences may be nested one within another, but each sequence must be entirely contained within a single content stream; it may not cross page boundaries, for example Note: The Contents entry of a page object (see Page Objects on page 87), which may be either a single stream or an array of streams, is considered a single stream with respect to marked-content sequences
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TABLE 98 Marked-content operators
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OPERANDS OPERATOR DESCRIPTION
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Designate a marked-content point tag is a name object indicating the role or signi cance of the point Designate a marked-content point with an associated property list tag is a name object indicating the role or signi cance of the point; properties is either an inline dictionary containing the property list or a name object associated with it in the Properties subdictionary of the current resource dictionary (see Section 951, Property Lists ) Begin a marked-content sequence terminated by a balancing EMC operator tag is a name object indicating the role or signi cance of the sequence Begin a marked-content sequence with an associated property list, terminated by a balancing EMC operator tag is a name object indicating the role or significance of the sequence; properties is either an inline dictionary containing the property list or a name object associated with it in the Properties subdictionary of the current resource dictionary (see Section 951, Property Lists ) End a marked-content sequence begun by a BMC or BDC operator
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When the marked-content operators BMC, BDC, and EMC are combined with the text object operators BT and ET (see Section 53, Text Objects ), each pair of matching operators (BMC EMC, BDC EMC, or BT ET) must be properly (separately) nested That is, the sequences
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951 Property Lists
The marked-content operators DP and BDC associate a property list with a marked-content element within a content stream This is a dictionary containing private information meaningful to the program (application or plug-in extension) creating the marked content Although the dictionary may contain any entries the program wishes to place there, it is suggested that any particular program use the entries in a consistent way; for example, the values associated with a given key should always be of the same type (or small set of types) If all of the values in a property list dictionary are direct objects, the dictionary may be written inline in the content stream as a direct object If any of the values are indirect references to objects outside the content stream, the property list dictionary must instead be de ned as a named resource in the Properties subdictionary of the current resource dictionary (see Section 372, Resource Dictionaries ) and then referenced by name as the properties operand of the DP or BDC operator