pbwest 2002/06/21 23:07:51
Added: docs/design/alt.design intro.xml
Log:
Intro and index
Revision Changes Path
1.1 xml-fop/docs/design/alt.design/intro.xml
Index: intro.xml
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<?xml version="1.0" standalone="no"?>
<!--
<!DOCTYPE document SYSTEM "../../xml-docs/dtd/document-v10.dtd">
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<!-- $Id: intro.xml,v 1.1 2002/06/22 06:07:51 pbwest Exp $ -->
<document>
<header>
<title>FOP Alternative Design</title>
<subtitle>Alternative Design Approach to FOP</subtitle>
<version>$Revision: 1.1 $ $Name: $</version>
<authors>
<person name="Peter B. West" email="[EMAIL PROTECTED]"/>
</authors>
</header>
<body>
<s1 title="Alternative Design">
<p>
This section of the FOP web site contains notes on approaches
to an alternative design for FOP. The individual documents
here are fragmentary, being notes of particular issues,
without an overall framework as yet.
</p>
<p>
The main aims of this redesign effort are:
</p>
<ul>
<li>full conformance with the Recommendation</li>
<li>increased performance</li>
<li>reduced memory footprint</li>
<li>no limitation on the size of files</li>
</ul>
<p>
In order to achieve these aims, the primary areas
of design interest are:
</p>
<ul>
<li>
Representing properties, for most purposes, as integers.
</li>
<li>
Distributing FOP processing over a number of threads with
single-point downstream communication and flow control by
means of traditional producer/consumer queues. The threads
so far under consideration are:
<ul>
<li>XML parser</li>
<li>FO tree builder</li>
<li>layout engine</li>
<li>Area tree builder</li>
</ul>
</li>
<li>
Representing trees with explicit Tree objects, rather than
as implicit relationships among other objects.
</li>
<li>
Caching integrated into the tree node access methods.
</li>
</ul>
<s2 title="Status and availability">
<p>
The <em>ALT DESIGN</em> effort is not taking place on the
main line of development, represented by the <em>HEAD</em>
tag on the CVS trunk. The source is available via the
FOP_0-20-0_Alt-Design tag. This code has only a crude,
non-<em>Ant</em> build environment, and is expected only to
compile at this stage. Only the parser stage and the first
stage of FO tree building is present. However, the first
example of producer/consumer binding is working, the Tree
class with inner Tree.Node and inner
Tree.Node.<em>iterators</em> classes are available and
working. Property handling is quite advanced, and is likely
to be almost complete some time in July, 2002.
</p>
<p>
Only <link href="mailto:[EMAIL PROTECTED]";>Peter
West</link> is working on the ALT DESIGN sub-project.
</p>
</s2>
</s1>
</body>
</document>
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