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Creates the ds_vars table, which acts as a key between the datasets and the var spec
xml_to_ds_vars(doc)
data frame with the dataset and variables
xml document
Other xml builder: xml_to_codelist(), xml_to_derivations(), xml_to_ds_spec(), xml_to_value_spec(), xml_to_var_spec()
xml_to_codelist()
xml_to_derivations()
xml_to_ds_spec()
xml_to_value_spec()
xml_to_var_spec()