AvXML-1.0-Namespaces
| Description | XML Namespace | Default namespace prefix |
| XML Schema | http://www.w3.org/2001/XMLSchema | xsd |
| Schematron | http://purl.oclc.org/dsdl/schematron | sch |
| XSLT v2 | http://www.w3.org/1999/XSL/Transform | xsl |
| XML Linking Language | http://www.w3.org/1999/xlink | xlink |
| OGC GML 3.2.1 | http://www.opengis.net/gml/3.2 | gml |
| ISO/TS 19139:2007 metadata XML schema implementation | http://www.isotc211.org/2005/gmd | gmd |
| OGC OMXML Observations and Measurements | http://www.opengis.net/om/2.0 | om |
| OGC OMXML Sampling Features | http://www.opengis.net/sampling/2.0 | sf |
| OGC OMXML Spatial Sampling Features | http://www.opengis.net/samplingSpatial/2.0 | sams |
| WMO Observable Property Model(1.0) | http://def.wmo.int/opm/2013 | opm |
| WMO METCE (1.0) | http://def.wmo.int/metce/2013 | metce |
| ICAO Simple Aviation Features (1.0) | http://icao.int/saf/1.0 | saf |
| ICAO Meteorological Information Exchange Model (1.0) | http://icao.int/iwxxm/1.0 | iwxxm |
Note that the XML Namespace is distinct from the schema locations. For reference, these are provided here.