[Mapbuilder-devel] FW: [wms-dev] CWXML-BXML library release

[Raj S. <ra...@ra...>]

------ Forwarded Message
> From: Craig Bruce <cs...@cu...>
> Date: Tue, 23 Sep 2003 01:39:05 -0400
> To: wm...@ma...
> Subject: [wms-dev] CWXML-BXML library release
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> For anyone who may be interested, CubeWerx has made a public beta release
> of its "cwxml" library.  The home page is at:
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> http://www.cubewerx.com/cwxml/
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> and a Binary-XML design & performance report is available at:
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> http://www.cubewerx.com/main/HTML/Binary_XML_Encoding.html
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> What is CWXML?
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> CWXML is an high-performance, open-source C-language library for parsing
> and generating XML and BXML (below) formats with a straightforward API.
> Initial testing indicates that it is 3 or more times as fast as other
> popular libraries such as expat and libxml2 at parsing XML and much
> faster again with BXML.  The library is being developed by CubeWerx as
> the reference implementation for the BXML format.  The parser accepts and
> automatically recognizes the following formats: XML, GZIPped XML, BXML,
> BXML with internal GZIP, and BXML with external GZIP.  It is licensed
> under the GNU LGPL.
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> What is BXML?
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> BXML (Binary XML) is an straightforward, open, patent-unencumbered
> binary-encoding format for XML data that is a stand-alone work-alike
> drop-in replacement for an XML file that mirrors the XML markup structure=
s
> in a way that is similar to the in-memory representations of many
> parser libraries.  BXML was developed by CubeWerx Inc. for the OpenGIS=AE
> Consortium and it makes all XML documents more compact and efficient to
> parse and generate by using a symbol table for element/attribute names
> and length-prefix encoding all arbitrary-length structures (strings,
> blobs, arrays).  But it especially makes dense-numeric XML documents much
> more efficient by allowing raw arrays of different common types of number=
s.
> For example, imagery data, the butt of many XML-bloat jokes, can be handl=
ed
> in BXML just as well if not better than it is handled in PNG format.
> A numeric array can pass from end-to-end in a client/server environment a=
s
> a raw chunk of data without ever being recoded.  Dense numeric data also
> compresses faster and more compactly when encoded in binary rather than
> text.  BXML also has features for random access.  The BXML specification
> is available from:
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> http://www.opengis.org/techno/discussions/03-002r8.pdf
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> It was originally designed in part to address GML-bulk/slowness problems.

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