A structured storage system to bundle these elements and any associated content into a single file, with data compression where appropriate.A font-embedding/replacement system to allow fonts to travel with the documents.An equivalent subset of the PostScript page description programming language but in declarative form, for generating the layout and graphics.In later PDF revisions, a PDF document can also support links (inside document or web page), forms, JavaScript (initially available as a plugin for Acrobat 3.0), or any other types of embedded contents that can be handled using plug-ins. Raster graphics for photographs and other types of images.Vector graphics for illustrations and designs that consist of shapes and lines.
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