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Example 427 shows a simple form XObject that paints a lled square 1000 units on each side
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Example 427 6 0 obj % Form XObject << /Type /XObject /Subtype /Form /FormType 1 /BBox [0 0 1000 1000] /Matrix [1 0 0 1 0 0] /Resources << /ProcSet [/PDF] >> /Length 58 >> stream 0 0 m 0 1000 l 1000 1000 l 1000 0 l f endstream endobj
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492 Group XObjects
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A group XObject (PDF 14) is a special type of form XObject that can be used to group graphical elements together as a unit for various purposes It is distinguished by the presence of the optional Group entry in the form dictionary (see Section 491, Form Dictionaries ) The value of this entry is a subsidiary group attributes dictionary describing the properties of the group As shown in Table 442, every group XObject has a group subtype (speci ed by the
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S entry in the group attributes dictionary) that determines the format and mean-
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ing of the dictionary s remaining entries Only one such subtype is de ned in PDF 14, a transparency group XObject (subtype Transparency) representing a transparency group for use in the transparent imaging model (see Section 73, Transparency Groups ) The remaining contents of this type of dictionary are described in Section 755, Transparency Group XObjects
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TABLE 442 Entries common to all group attributes dictionaries
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KEY TYPE VALUE
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Type S
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(Optional) The type of PDF object that this dictionary describes; if present, must be Group for a group attributes dictionary (Required) The group subtype, which identi es the type of group whose attributes this dictionary describes and determines the format and meaning of the dictionary s remaining entries The only group subtype de ned in PDF 14 is Transparency; see Section 755, Transparency Group XObjects, for the remaining contents of this type of dictionary Other group subtypes may be added in the future
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Reference XObjects (PDF 14) enable one PDF document to import content from another The document in which the reference occurs is called the containing document; the one whose content is being imported is the target document The target document may reside in a le external to the containing document or may be included within it as an embedded le stream (see Section 3103, Embedded File Streams ) The reference XObject in the containing document is a form XObject containing the optional Ref entry in its form dictionary, as described below This object serves as a proxy that can be displayed or printed in place of the imported content The proxy might consist of a low-resolution image of the imported content, a piece of descriptive text referring to it, a gray box to be displayed in its place, or any other similar placeholder Viewer applications that do not recognize the Ref entry will simply display or print the proxy as an ordinary form XObject; those that do implement reference XObjects can use the proxy in place of the imported content if the latter is unavailable A viewer application may also provide a user interface to allow editing and updating of imported content links The imported content consists of a single, complete PDF page in the target document It is designated by a reference dictionary, which in turn is the value of the Ref entry in the reference XObject s form dictionary (see Section 491, Form Dictionaries ) It is the presence of the Ref entry that distinguishes reference XObjects from other types of form XObject Table 443 shows the contents of the reference dictionary
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TABLE 443 Entries in a reference dictionary
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KEY TYPE VALUE
F Page
le speci cation integer or text string
(Required) The le containing the target document (Required) A page index or page label (see Section 831, Page Labels ) identifying the page of the target document containing the content to be imported Note that the reference is a weak one and can be inadvertently invalidated if the referenced page is changed or replaced in the target document after the reference is created (Optional) An array of two strings constituting a le identi er (see Section 93, File Identi ers ) for the le containing the target document The use of this entry improves a viewer application s chances of nding the intended le and allows it to warn the user if the le has changed since the reference was created