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[svn-r2403] XML_DTD/DesignNotes.html: Revision of 12 June 2000

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Frank Baker
2000-06-22 11:13:22 -05:00
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doc/html/XML_DTD/DesignNotes.html
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@@ -12,18 +12,21 @@
</font>
<a href="http://hdf.ncsa.uiuc.edu/DTDs/HDF5-File.dtd"><font size=-1 face=courier>HDF5-File.dtd</font></a>
<h2>
The XML DTD for HDF5:&nbsp; Design Notes</h2>
April 28, 2000
June 12, 2000
<br>Feedback to:&nbsp; <a href="mailto:hdfdev@ncsa.uiuc.edu">hdfdev@ncsa.uiuc.edu</a>
<h3>
<b>1.&nbsp; Introduction</b></h3>
The XML "Document Type Definition" (DTD) [17] for HDF5 is a markup language
to describe the contents of an HDF5 file.[<a href="#R1">1</a>]&nbsp; This
DTD specifies a standard for using XML to describe the structure and contents
of a <i>single</i> HDF5 file.&nbsp; The DTD can be used in a variety of
ways, by standard software and by application specific software that builds
on standard XML features.&nbsp; The DTD will enable descriptions of HDF5
files to be used with and translated to other similar XML markup languages.
The XML "Document Type Definition" (DTD) [<a href="#R17">17</a>] for HDF5
is a markup language to describe the contents of an HDF5 file.[<a href="#R1">1</a>]&nbsp;
This DTD specifies a standard for using XML to describe the structure and
contents of a <i>single</i> HDF5 file.&nbsp; The DTD can be used in a variety
of ways, by standard software and by application specific software that
builds on standard XML features.&nbsp; The DTD will enable descriptions
of HDF5 files to be used with and translated to other similar XML markup
languages.
<p>This document discusses some of the key features of the HDF5 DTD, and
some of the design decisions that were considered during its development.
<p>The HDF5 data model is somewhat complex, with a great deal of flexibility
@@ -311,7 +314,8 @@ makes no sense according to the rules of HDF5, and those rules must be
enforced by the applications that create and use the XML description.
<p><b>3.3&nbsp; The Data Values</b>
<p>While representing metadata with XML was fairly straightforward, it
was less obvious what should be done with the data values.&nbsp; For different
was
less obvious what should be done with the data values.&nbsp; For different
purposes, it may be better to:
<ul>
<li>
@@ -362,6 +366,12 @@ specified.
file for the first release.&nbsp; The initial version of the DTD has a
limited <tt>&lt;Data> </tt>element, which does not support all the desired
features.&nbsp; This will be revised in a future release.
<p>We were not able to create a satisfactory markup for data in the HDF5
file for the first release. The initial version of the DTD has a limited
<tt>&lt;Data></tt>
element, which does not support all the desired features. Details of this
limited <tt>&lt;Data></tt> element can be found in [<a href="#R18">18</a>].&nbsp;
This will be revised in a future release.
<p><b>3.4&nbsp; File Format Details</b>
<p>The DTD must be able to support applications that need to fully describe
the details of a specific HDF5 file.&nbsp; For example, in order to verify
@@ -437,17 +447,20 @@ These elements are only partly defined in the first release of the DTD.
Definition Language (ODL) Specification and Usage", <a href="http://pds.jpl.nasa.gov/stdref/chap12.htm">http://pds.jpl.nasa.gov/stdref/chap12.htm</a></li>
<li>
<a NAME="R14"></a>SAX 1.0:&nbsp; The Simple API for XML,
<a href="http://www.megginson.com/sAX/index.html">http://www.megginson.com/sAX/index.html</a></li>
<a NAME="R14"></a>SAX 1.0:&nbsp; The Simple API for XML, <a href="http://www.megginson.com/sAX/index.html">http://www.megginson.com/sAX/index.html</a></li>
<li>
<a NAME="R15"></a> Document Object Model (DOM), <a href="http://www.w3.org/DOM/">http://www.w3.org/DOM/</a></li>
<a NAME="R15"></a>Document Object Model (DOM), <a href="http://www.w3.org/DOM/">http://www.w3.org/DOM/</a></li>
<li>
<a NAME="R16"></a> OpenGIS, <a href="http://opengis.org/">http://opengis.org/</a></li>
<a NAME="R16"></a>OpenGIS, <a href="http://opengis.org/">http://opengis.org/</a></li>
<li>
<a NAME="R17"></a>XML, <a href="http://www.w3.org/XML">http://www.w3.org/XML</a></li>
<li>
<a NAME="R18"></a>Mike Folk, "Proposal for representing simple data in
HDFXML DTD", <a href="XML_data_spec_Rev_3.pdf">http://hdf.ncsa.uiuc.edu/HDF5/XML/XML_data_spec_Rev_3.pdf</a></li>
</ol>
</body>