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<?xml version="1.0" standalone="no"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN"
"http://cvs.apache.org/viewcvs.cgi/*checkout*/xml-forrest/src/resources/schema/dtd/document-v11.dtd">
<document>
<header>
<title>FO User Agent</title>
<subtitle>Design of FO User Agent</subtitle>
<authors>
<person name="Keiron Liddle" email="keiron@aftexsw.com"/>
</authors>
</header>
<body>
<section>
<title>Purpose</title>
<p>
Technically the user agent is FOP in the role of determining the
output format and when resolving various attributes. The user
agent is represented by a class that is available to others to
specify how FOP should behave.
</p>
<p>
The user agent is used by the formatting process to determine
certain user definable values.
</p>
<p>
It will enable the customisation of values for generating and
rendering the document.
</p>
<p>
The user agent must be available to the layout processor and
the renderer. Users can supply their own user agent or use
the default one for a particular renderer.
</p>
<p>
The user agent needs to be made available to the property
resolution layout process and the renderer.
</p>
<p>
Standard Features:
</p>
<ul>
<li>error handling, what to do if fo markup is invalid</li>
<li>auto overflow value and handling error-if-overflow</li>
<li>adjusting length values (eg. for borders) to renderable values</li>
<li>available fonts</li>
<li>converting cm/in to pt (dpi)</li>
<li>active state for multi properties</li>
<li>title, used to identify a set of pages (in a page sequence)</li>
<li>the width (in inline-progression-dimension) of a character with
treat-word-as-space true</li>
<li>maximum space used by conditional areas from region-reference-area</li>
<li>if there should be "hot links" to before floats or footnotes</li>
<li>when to clear side floats if space in inline-progression-dimension
is not enough</li>
<li>placement of left over footnotes on a page with a region-body</li>
<li>using color property as border colour</li>
<li>interpretting all border styles (except outset) as solid</li>
<li>thin, medium and thick values for border width</li>
<li>initial font-family value</li>
<li>absolute font sizes (eg, xx-small, x-small etc.)</li>
<li>relative font sizes (eg. larger, smaller)</li>
<li>small caps simulation</li>
<li>font weight mapping</li>
<li>baseline info for a font if not available</li>
<li>determining sub/superscript when another baseline is dominant</li>
<li>scaling method for external-graphic and instream-foreign-object</li>
<li>the width of a replaced element</li>
<li>"normal" line height value</li>
<li>text alignment (stretching the line with letter and word spacing)</li>
<li>text transform</li>
<li>initial color</li>
<li>rendering intent of auto</li>
<li>dot character for leader</li>
<li>line breaking with leaders, use optimum length when breaking the line</li>
<li>page height/width of auto</li>
<li>left and right caption widths</li>
<li>glyph orientation vertical of auto</li>
<li>rendering processor of content-type (mime type)</li>
</ul>
<p>
Interactive Features:
</p>
<ul>
<li>inline and block scroll amount</li>
<li>dynamic effects, links and property sets</li>
<li>initial "pause-after", "pause-before" and "voice-family" value</li>
<li>treating fixed as scroll on background attachement</li>
<li>media usage of auto</li>
</ul>
</section>
</body>
</document>
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