Issues TODO:
https://docs.opendap.org/index.php/DAP4:_Specification_Volume_1#DMR_XML_Format
DMR template or xml schema:
Grid, map ... etc.
Path for attributes in case of compound type (groups).
Dot or underscore in names. (For instance name="_4.4_KM_PRODUCTS_X_Dim").
Should avoid the same dimension in different groups?