<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
	<id>https://docs.opendap.org/index.php?action=history&amp;feed=atom&amp;title=DAP4%3A_Coordinate_Systems_Element</id>
	<title>DAP4: Coordinate Systems Element - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://docs.opendap.org/index.php?action=history&amp;feed=atom&amp;title=DAP4%3A_Coordinate_Systems_Element"/>
	<link rel="alternate" type="text/html" href="https://docs.opendap.org/index.php?title=DAP4:_Coordinate_Systems_Element&amp;action=history"/>
	<updated>2026-06-22T07:55:14Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.38.4</generator>
	<entry>
		<id>https://docs.opendap.org/index.php?title=DAP4:_Coordinate_Systems_Element&amp;diff=7866&amp;oldid=prev</id>
		<title>DennisHeimbigner: Created page with &quot;=== Background === John has noted that in CDM, he introduced a notion of Coordinate System which is a set of maps defined independently of any variable. In xml, this would be som...&quot;</title>
		<link rel="alternate" type="text/html" href="https://docs.opendap.org/index.php?title=DAP4:_Coordinate_Systems_Element&amp;diff=7866&amp;oldid=prev"/>
		<updated>2012-04-10T17:10:15Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;=== Background === John has noted that in CDM, he introduced a notion of Coordinate System which is a set of maps defined independently of any variable. In xml, this would be som...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;=== Background ===&lt;br /&gt;
John has noted that in CDM, he introduced a notion of Coordinate System which is a set of maps defined independently of any variable. In xml, this would be something like this.&lt;br /&gt;
&amp;lt;pre&amp;gt;&amp;lt;CoordinateSystem name=&amp;quot;...&amp;quot;&amp;gt;&lt;br /&gt;
&amp;lt;map variable=&amp;quot;var1&amp;quot;/&amp;gt;&lt;br /&gt;
...&lt;br /&gt;
&amp;lt;map variable=&amp;quot;varn&amp;quot;/&amp;gt;&lt;br /&gt;
&amp;lt;/CoordinateSystem&amp;gt;&lt;br /&gt;
&amp;lt;/pre&amp;gt;&lt;br /&gt;
==Rationale==&lt;br /&gt;
The argument for it is that sets of maps are often going to be used in identical form in a number of variables. Further, it allows one to add attributes to the coordinate system element to provide extra information.&lt;br /&gt;
&lt;br /&gt;
==Proposal==&lt;br /&gt;
Do we add this element to the DDX?&lt;br /&gt;
&lt;br /&gt;
==Discussion==&lt;br /&gt;
There seems no immediate hurry on this. It can be added rather transparently later on when a demonstrated need exists.&lt;/div&gt;</summary>
		<author><name>DennisHeimbigner</name></author>
	</entry>
</feed>