http://www.aixm.aero/schema/5.1/profile/gml4aixm.xsd AIXM_DataTypes.xsd Package containing the datatypes that are used throughout the AIXM. There are three different types of datatypes: - datatype - This is basic data type that specifies a pattern to use. - enumeration - This codes a fixed list of values. The OTHER value is important for mapping future changes to the list. If a value is added in the future and is not recognised by the current enumeration, it is mapped to the OTHER value. - codelist - This is similar to an enumeration in that it is used to indicate a list of possible values. However, the list can be expanded, which means that the codelist is a union between the explicitly enumerated values and free text.