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+<head>
+<title>UK TeX FAQ -- question label eps</title>
+</head><body>
+<h3>What is &ldquo;Encapsulated PostScript&rdquo; (&ldquo;EPS&rdquo;)</h3>
+<p/>PostScript has been for many years a <em>lingua franca</em> of powerful
+printers (modern high-quality printers now tend to require some
+constrained form of Adobe Acrobat, instead); 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 &ldquo;leaking&rdquo; (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 &ldquo;structured comments&rdquo; are required; important ones are
+ the identification of the file type, and information about the
+ &ldquo;bounding box&rdquo; of the figure (i.e., the minimum rectangle
+ enclosing it);
+<li> some commands are forbidden &mdash; for example, a <code>showpage</code>
+ command will cause the image to disappear, in most TeX-output
+ environments; and
+<li> &ldquo;preview information&rdquo; is permitted, for the benefit of things
+ such as word processors that don&rsquo;t have the ability to draw
+ PostScript in their own right &mdash; 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
+&ldquo;Encapsulated PostScript&rdquo; (EPS) 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&rsquo;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>