Search results
18 wrz 2008 · The PDF file structure determines how objects are stored in a PDF file, how they are accessed, and how they are updated. This structure is independent of the semantics of the objects. Sub- clause 7.5, "File Structure," describes the file structure.
In this chapter, we leave behind the bits and bytes of the PDF file, and consider the logical structure. We consider the trailer dictionary, document catalog, and page tree. We enumerate the required entries in each object. We then look at two common structures in PDF files: text strings and dates.
Any references to a “PostScript printer,” a “PostScript file,” or a “PostScript driver” refer to printers, files, and driver programs (respectively) which are written in or support the PostScript language.
A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [ 23 ]
PDF files use a fixed structure, they always contain 4 sections: A header, which contains information on the PDF-specifications the file adheres to. This line looks like this: ‘%PDF-1.2’. The body area which contains a description of the various elements that are placed on the pages.
Chapter 1. Introduction. The Portable Document Format (PDF) is the world’s leading language for describing the printed page, and the first one equally suitable for paper and online use. In this chapter, we take a tour of its uses, features, and history.
In this chapter, we describe the layout and content of the PDF file’s four main sections, and the syntax of the objects which make up each one. We also outline the process of reading a PDF file into a high level data structure, and the converse operation of writing that structure to a PDF file.
