function used to get the namespaces handled by an SDMX-ML object
Usage
namespaces.SDMX(xmlObj)
Arguments
xmlObj
an object of class "XMLInternalDocument"
Value
an object of class "data.frame" giving the namespace(s) id and uri
Warning
namespaces.SDMX is a function used internally to get the
namespaces of the SDMX-ML object through getNamespaces. This last function
is used an utility re-used in the different SDMX document parsers.