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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.
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.
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.
19 sty 2016 · Some basic realities of consuming PDF files are essential for implementations that seek to provide a consistent experience of accessible PDF files. AT must present structure elements in a suitable way. Just as AT informs the user when a <Figure> is encountered, AT should be capable of inform the user of, for example <Reference> tags .
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.
D.3 Symbol Set and Encoding 718 D.4 ZapfDingbats Set and Encoding 721 Appendix E: PDF Name Registry 723 Appendix F: Linearized PDF 725 F.1 Background and Assumptions 726 F.2 Linearized PDF Document Structure 728 F.3 Hint Tables 741 F.4 Access Strategies 751 Appendix G: Example PDF Files 757 G.1 Minimal PDF File 757 G.2 Simple Text String ...
