![]() 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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