Set of query functionsReturns data in WaterML Zaslavsky et al., 2007, OGC 07-041r1, http://portal.opengeospatial.org/files/?artifact_id=21743http://portal.opengeospatial.org/files/?artifact_id=21743 WaterML and WaterOneFlow WaterML is an XML language for communicating water data WaterOneFlow is a set of web services based on WaterML.