![]() ![]() Sub-clauseħ.8, "Content Streams and Resources," discusses PDF content streams and their associated resources. These instructions, while also represented as objects, are conceptuallyĭistinct from the objects that represent the document structure and are described separately. A PDF content stream contains a sequence of instructions describing the appearance ofĪ page or other graphical entity. "Document Structure," describes the overall document structure later clauses address the detailed Represent components of a PDF document: pages, fonts, annotations, and so forth. ![]() The PDF document structure specifies how the basic object types are used to Mechanism for protecting a document’s contents from unauthorized access. Sub-clause 7.6, "Encryption," describes a file-level Sub-Ĭlause 7.5, "File Structure," describes the file structure. This structure is independent of the semantics of the objects. The PDF file structure determines how objects are stored in a PDF file, how they areĪccessed, and how they are updated. Sub-clause 7.3.8, "Stream Objects," provides complete details of the most complex data type, the stream Sub-clause 7.3, "Objects," describes the syntax and essential properties of the objects. Sub-clause 7.2, "Lexical Conventions," describes the character set used to write objects and other A PDF document is a data structure composed from a small set of basic types of data objects. ![]() PDF syntax is best understood by considering it as four parts, as shown in Figure 1: ![]()
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