gml:UnitDefinitionType

Definition of a unit of measure (or uom). The definition includes a quantityType property, which indicates the phenomenon to which the units apply, and a catalogSymbol, which gives the short symbol used for this unit. This element is used when the relationship of this unit to other units or units systems is unknown.

Complex type information

Content

• Sequence [1..1]
  from type gml:DefinitionType
  gml:metaDataProperty [0..*]    Contains or refers to a metadata package that contains metadata properties.
  gml:description [0..1]    Contains a simple text description of the object, or refers to an external description.
  Choice [1..*]
  from subst. group gml:name
  gml:name    Label for the object, normally a descriptive name. An object may have several names, typically assigned by different authorities. The authority for a name is indicated by the value of its (optional) codeSpace attribute. The name may or may not be unique, as determined by the rules of the organization responsible for the codeSpace.
  gml:csName    The name by which this coordinate system is identified.
  gml:coordinateOperationName    The name by which this coordinate operation is identified.
  gml:methodName    The name by which this operation method is identified.
  gml:parameterName    The name by which this operation parameter is identified.
  gml:groupName    The name by which this operation parameter group is identified.
  gml:datumName    The name by which this datum is identified.
  gml:meridianName    The name by which this prime meridian is identified. The meridianName most common value is Greenwich, and that value shall be used when the greenwichLongitude value is zero.
  gml:ellipsoidName    The name by which this ellipsoid is identified.
  gml:srsName    The name by which this reference system is identified.
  1. gml:quantityType [1..1]    Informal description of the phenomenon or type of quantity that is measured or observed. For example, "length", "angle", "time", "pressure", or "temperature". When the quantity is the result of an observation or measurement, this term is known as Observable Type or Measurand.
  2. gml:catalogSymbol [0..1]    For global understanding of a unit of measure, it is often possible to reference an item in a catalog of units, using a symbol in that catalog. The "codeSpace" attribute in "CodeType" identifies a namespace for the catalog symbol value, and might reference the catalog. The "string" value in "CodeType" contains the value of a symbol that is unique within this catalog namespace. This symbol often appears explicitly in the catalog, but it could be a combination of symbols using a specified algebra of units. For example, the symbol "cm" might indicate that it is the "m" symbol combined with the "c" prefix.

Attributes

Used by

• Element gml:UnitDefinition
• Element gml:BaseUnit via derived type gml:BaseUnitType
• Element gml:ConventionalUnit via derived type gml:ConventionalUnitType
• Element gml:DerivedUnit via derived type gml:DerivedUnitType
• Element gmx:ML_BaseUnit via derived type gmx:ML_BaseUnit_Type
• Element gmx:ML_ConventionalUnit via derived type gmx:ML_ConventionalUnit_Type
• Element gmx:ML_DerivedUnit via derived type gmx:ML_DerivedUnit_Type
• Element gmx:ML_UnitDefinition via derived type gmx:ML_UnitDefinition_Type
• Element gmx:UomAlternativeExpression via derived type gmx:UomAlternativeExpression_Type

Type inheritance chain

• gml:AbstractGMLType
  • gml:DefinitionType
    • gml:UnitDefinitionType
      • extended by gmx:ML_UnitDefinition_Type
      • extended by gmx:UomAlternativeExpression_Type
      • extended by gml:BaseUnitType
        • extended by gmx:ML_BaseUnit_Type
      • extended by gml:DerivedUnitType
        • extended by gmx:ML_DerivedUnit_Type
      • extended by gml:ConventionalUnitType
        • extended by gmx:ML_ConventionalUnit_Type