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<?xml version="1.0" standalone="no"?>
<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>
<s1 title="Purpose">
<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:
<ul>
<li><p>
error handling, what to do if fo markup is invalid
</p></li>
<li><p>
auto overflow value and handling error-if-overflow
</p></li>
<li><p>
adjusting length values (eg. for borders) to renderable values
</p></li>
<li><p>
available fonts
</p></li>
<li><p>
converting cm/in to pt (dpi)
</p></li>
<li><p>
active state for multi properties
</p></li>
<li><p>
title, used to identify a set of pages (in a page sequence)
</p></li>
<li><p>
the width (in inline-progression-dimension) of a character with
treat-word-as-space true
</p></li>
<li><p>
maximum space used by conditional areas from region-reference-area
</p></li>
<li><p>
if there should be "hot links" to before floats or footnotes
</p></li>
<li><p>
when to clear side floats if space in inline-progression-dimension
is not enough
</p></li>
<li><p>
placement of left over footnotes on a page with a region-body
</p></li>
<li><p>
using color property as border colour
</p></li>
<li><p>
interpretting all border styles (except outset) as solid
</p></li>
<li><p>
thin, medium and thick values for border width
</p></li>
<li><p>
initial font-family value
</p></li>
<li><p>
absolute font sizes (eg, xx-small, x-small etc.)
</p></li>
<li><p>
relative font sizes (eg. larger, smaller)
</p></li>
<li><p>
small caps simulation
</p></li>
<li><p>
font weight mapping
</p></li>
<li><p>
baseline info for a font if not available
</p></li>
<li><p>
determining sub/superscript when another baseline is dominant
</p></li>
<li><p>
scaling method for external-graphic and instream-foreign-object
</p></li>
<li><p>
the width of a replaced element
</p></li>
<li><p>
"normal" line height value
</p></li>
<li><p>
text alignment (stretching the line with letter and word spacing)
</p></li>
<li><p>
text transform
</p></li>
<li><p>
initial color
</p></li>
<li><p>
rendering intent of auto
</p></li>
<li><p>
dot character for leader
</p></li>
<li><p>
line breaking with leaders, use optimum length when breaking the line
</p></li>
<li><p>
page height/width of auto
</p></li>
<li><p>
left and right caption widths
</p></li>
<li><p>
glyph orientation vertical of auto
</p></li>
<li><p>
rendering processor of content-type (mime type)
</p></li>
</ul>
</p>
<p>
Interactive Features:
<ul>
<li><p>
inline and block scroll amount
</p></li>
<li><p>
dynamic effects, links and property sets
</p></li>
<li><p>
initial "pause-after", "pause-before" and "voice-family" value
</p></li>
<li><p>
treating fixed as scroll on background attachement
</p></li>
<li><p>
media usage of auto
</p></li>
</ul>
</p>
</s1>
</body>
</document>
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