libdap4: Some dap4 components in the DMR don't conform to the dap4.xsd schema

[ndp-opendap]

Attribute value element names

In the dap4.xsd schema the Attribute value element names are lower-case: {{...}}.

But libdap4 is producing documents in which the value element name is capitalized {{...}}

Dataset@version attribute name

The scheme defines the Dataset@version attribute name as {{version}}

But libdap4 is transmitting the name {{dmrVersion}}

Do we amend the spec to include both, or change lib4?

[ndp-opendap]

These attribute names are written into DMR XML in libdap4/DMR.cc on lines 320-326