Returns a data.frame with the time series chosen from INEGI webservice. If the parameter Metadata is TRUE, a list
is returned with two objects: data and metadata.
# NOT RUN {# General INPC seriestoken<-"webservice_token"url <- "http://www3.inegi.org.mx/sistemas/api/indicadores/v1//Indicador/216064/00000/es/false/xml/"INPC <- inegi_series(url, token)
# }