Abstract
In oder to satisfy the user requirements for device-independent printer interfacing, ISO/IEC JTC1/SC18/WG8 has been developed Standard Page Description Language (SPDL). The SPDL is a language for the specification of formatted documents, comprised of black and white, gray scale, or full colour glyph-texts, raster graphics and geometric graphics, in a form suitable for presentation. An SPDL document represents an ideal image specified by composition and layout processes. When given a SPDL document, the SPDL processor with in a presentation device renders the document to the constraints of the actual device so as to provide the best possible approximation to the ideal image. An SPDL document has a layered structure and contents. The structure can be processed independently of the contents. The imaging is performed being based on a two dimensional graphics model appropriate for device-independent usage and for high quality printing. By using font resources defined in ISO/IEC 9541. SPDL can describe complicated glyph-texts containing a number of fonts in any writing modes. The interchange format of SPDL documents has two representations, clear text and binary.
