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Mosaic <br /> then displays all level 1heading using the same font and allows the user to select a different <br />Mosaic <br />font family with a menu selection (or program resource). supports several different layers <br />for headings and general text formatting (e.g., emphasis, bold). <br />Hypertext links are implemented by using ?anchors.? The author of the HTML documentation is <br />responsible for determining how text is to be ?hypertexted.? For example, the author would have to <br />determine that clicking on the word ?CRSM? will cause a page defining CRSM to be displayed. In <br />this case the word ?CRSM? is an anchor and points to the document with the CRSM information. <br />Adding such hypertext links can be taken to the extreme with every other word pointing to different <br />information. <br />Mosaic <br /> works with three basic file types: <br />HTML files Mosaic <br />1. . These files contain HTML commands that understands and can <br />format. <br />GIF files Mosaic <br />2. . These are raster images files in a format that inherently understands <br />how to display. The GIF format is widely used for images and provides a relatively <br />compact storage format that supports color images. <br />Text files <br />3. . These are ASCII files that contain preformatted information such as output <br />Mosaic <br />from other programs. can import such files and does not try to format the files. <br />Mosaic <br />HTML files are the ?glue? that hold documentation together. However, the development of <br />HTML files requires that the author of documentation understand HTML syntax and be willing to <br />expend a certain amount of effort in developing HTML versions of software documentation. This <br />effort may be too expensive to implement fully in certain cases. <br />GIF files can be intermingled with text in HTML files and can even be used as anchors. Image files <br />that are not in GIF format can be displayed using an external viewing program (the default is the <br />xv lview <br />public domain program on UNIX workstations and on PCs); however, in such cases, the <br />image cannot be intermingled with the text and the use of an additional window to view the image is <br />somewhat distracting to the user. Consequently, RTi proposes to convert all images to the GIF <br />xv <br />format where possible. This can generally be done using the public domain program. <br />Text files can be used effectively when documentation consists of output from a program or is a <br />conversion of a word-processor document. For example, a text file may be an output file from an <br />analysis program. Or it may be a text version of a WordPerfect document exported from <br />WordPerfect. <br />Mosaic <br />The program will also display PostScript files using an external viewer (the default viewer is <br />Ghostview <br />the public domain program). Again, this prevents the documentation from being <br />intermingled with HTML text and requires that the user deal with an additional window. However, <br />use of the PostScript viewer may be appropriate in cases where existing documentation is in a <br />format that cannot be easily converted to HTML or text files (e.g., the WordPerfect version of the <br />MODSIM documentation, which contains equations that cannot be easily translated). Long <br />documents should be split into manageable sections or chapters in the cases where PostScript files <br />are part of the on-line documentation. <br />3 <br />A275 06.29.94 1.05-12 Malers <br />