DAP4: Coordinate Systems Element

From OPeNDAP Documentation

1 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 something like this.

<CoordinateSystem name="...">
<map variable="var1"/>
...
<map variable="varn"/>
</CoordinateSystem>

2 Rationale

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.

3 Proposal

Do we add this element to the DDX?

4 Discussion

There seems no immediate hurry on this. It can be added rather transparently later on when a demonstrated need exists.