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<title>Document Parts (The GNU Troff Manual)</title>
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Previous: <a href="Argument-Units.html" accesskey="p" rel="prev">Argument Units</a>, Up: <a href="Language-Concepts.html" accesskey="u" rel="up">Language Concepts</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsubsection" id="Document-Parts-1">6.1.1.3 Document Parts</h4>
<p>A correct intermediate output document consists of two parts, the
<em class="dfn">prologue</em> and the <em class="dfn">body</em>.
</p>
<p>The task of the prologue is to set the general device parameters using
three exactly specified commands. <code class="code">gtroff</code>’s prologue is
guaranteed to consist of the following three lines (in that order):
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">x T <var class="var">device</var>
x res <var class="var">n</var> <var class="var">h</var> <var class="var">v</var>
x init
</pre></div></div>
<p>with the arguments set as outlined in <a class="ref" href="Device-Control-Commands.html">Device Control Commands</a>.
The parser for the intermediate output format is able to interpret
additional whitespace and comments as well even in the prologue.
</p>
<p>The body is the main section for processing the document data.
Syntactically, it is a sequence of any commands different from the ones
used in the prologue. Processing is terminated as soon as the first
‘<samp class="samp">x stop</samp>’<!-- /@w --> command is encountered; the last line of any
<code class="code">gtroff</code> intermediate output always contains such a command.
</p>
<p>Semantically, the body is page oriented. A new page is started by a
‘<samp class="samp">p</samp>’ command. Positioning, writing, and drawing commands are always
done within the current page, so they cannot occur before the first
‘<samp class="samp">p</samp>’ command. Absolute positioning (by the ‘<samp class="samp">H</samp>’ and ‘<samp class="samp">V</samp>’
commands) is done relative to the current page; all other positioning is
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