DAP4: Attribute values that conform to the DAP4 specification are not read correctly.

[ndp-opendap]

The DAP4 specification section 1.5.14 indicates that Attribute values may be encoded in the DMR as:

<Attribute name="name" type="{atomicTypeName|EnumType fqn}">
  <Namespace href="http://netcdf.ucar.edu/cf"/> <!--optional-->
  <Value value="value"/>
  ...
  <Value value="value"/>
</Attribute>

or

<Attribute name="name" type="{atomicTypeName|EnumType fqn}" value="value"/>

Yet getdap4 (and thus by association libdap) fails to read Attribute values encoded this way. The TDS uses thee aforementioned encodings and the getdap4 is used to retrieve the DMR:

getdap4 -d "http://35.87.12.216:8080/thredds/dap4/data/NSIDC/SMAP_L3_SM_P_20150406_R14010_001.h5"

All of the Attribute values are empty:

            <Attribute name="_ChunkSizes" type="UInt32">
                <Value></Value>
                <Value></Value>
            </Attribute>

We can see with curl:

curl -L "http://35.87.12.216:8080/thredds/dap4/data/NSIDC/SMAP_L3_SM_P_20150406_R14010_001.h5.dmr"

That the TDS returns values:

            <Attribute name="_ChunkSizes" type="UInt32">
                <Value value="1"/>
                <Value value="964"/>
            </Attribute>