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+<head>
+<title>UK TeX FAQ -- question label eps</title>
+</head><body>
+<h3>What is "Encapsulated PostScript"</h3>
+<p>PostScript has over the years become a <em>lingua franca</em> of
+powerful printers; since PostScript is also a powerful graphical
+programming language, it is commonly used as an output medium for
+drawing (and other) packages.
+<p>However, since PostScript <em>is</em> such a powerful language, some
+rules need to be imposed, so that the output drawing may be included
+in a document as a figure without "leaking" (and thereby destroying
+the surrounding document, or failing to draw at all).
+<p>Appendix H of the PostScript Language Reference Manual (second
+and subsequent editions), specifies a set of rules for PostScript to
+be used as figures in this way. The important features are:
+<ul>
+<li> certain "structured comments" are required; important ones are
+ the identification of the file type, and information about the
+ "bounding box" of the figure (i.e., the minimum rectangle
+ enclosing it);
+<li> some commands are forbidden - for example, a <code>showpage</code>
+ command will cause the image to disappear, in most TeX-output
+ environments; and
+<li> "preview information" is permitted, for the benefit of things
+ such as word processors that don't have the ability to draw
+ PostScript in their own right - this preview information may be in
+ any one of a number of system-specific formats, and any viewing
+ program may choose to ignore it.
+</ul>
+A PostScript figure that conforms to these rules is said to be in
+"Encapsulated PostScript" format. Most (La)TeX packages for
+including PostScript are structured to use Encapsulated PostScript;
+which of course leads to much hilarity as exasperated (La)TeX users
+struggle to cope with the output of drawing software whose authors
+don't know the rules.
+<p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=eps">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=eps</a>
+</body>