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PDF20 Spec 14 General
Part of: PDF20-Spec-14-Document
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Document interchange
14.1 General The features described in this clause do not affect the final appearance of a document. Rather, these features enable a document to include higher-level information useful to the interchange of documents among PDF processors: •
Procedure sets (14.2, "Procedure sets") that define the implementation of PDF operators (deprecated in PDF 2.0)
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Metadata (14.3, "Metadata") consisting of general information about a document or a component of a document, such as its title, author, and creation and modification dates
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File identifiers (14.4, “File identifiers") for reliable reference from one PDF file to another
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Page-piece dictionaries (14.5, "Page-piece dictionaries") allow a PDF processor to embed private data in a PDF document for its own use
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Marked-content operators (14.6, "Marked content") for identifying portions of a content stream and associating them with additional properties or externally specified objects
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Logical structure facilities (14.7, "Logical structure") for imposing a hierarchical organisation on the content of a document
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Tagged PDF (14.8, "Tagged PDF"), a set of conventions for using marked-content and logical structure facilities to enable the extraction and reuse of a document’s content for other purposes
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Various ways of enhancing the repurposing and accessibility of a document (14.9, "Repurposing and accessibility support"), including natural language identification of document content
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The Web Capture extension (14.10, "Web capture"), which creates PDF files from Internet-based or locally resident HTML, PDF, GIF, JPEG, and ASCII text files
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Facilities supporting prepress production workflows (14.11, "Prepress support"), such as the specification of page boundaries and the generation of printer’s marks, colour separations, output intents, traps, and low-resolution proxies for high-resolution images
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Subclause 14.12, “Document parts" describes how additional page-level grouping information can be added to a PDF file. A primary use of document parts is to facilitate job ticket-based workflows that process large documents section by section.
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Subclause 14.13, "Associated files" describes a means to associate content in other formats with selected objects of a PDF file and to identify the relationship between them.
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