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lib/Geo/GML/xsd/gml-3.2.1/units.xsd  view on Meta::CPAN

<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="http://www.opengis.net/gml/3.2" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml/3.2" elementFormDefault="qualified" xml:lang="en" version="3.2.1.2">
	<annotation>
		<appinfo source="urn:x-ogc:specification:gml:schema-xsd:units:3.2.1">units.xsd</appinfo>
		<documentation>See ISO/DIS 17.2.
Several GML Schema components concern or require a reference scale or units of measure.  Units are required for quantities that may occur as values of properties of feature types, as the results of observations, in the range parameters of a coverage,...
The basic unit definition is an extension of the general gml:Definition element defined in 16.2.1.  Three specialized elements for unit definition are further derived from this. 
This model is based on the SI system of units [ISO 1000], which distinguishes between Base Units and Derived Units.  
-	Base Units are the preferred units for a set of orthogonal fundamental quantities which define the particular system of units, which may not be derived by combination of other base units.  
-	Derived Units are the preferred units for other quantities in the system, which may be defined by algebraic combination of the base units.  
In some application areas Conventional units are used, which may be converted to the preferred units using a scaling factor or a formula which defines a re-scaling and offset.  The set of preferred units for all physical quantity types in a particula...
Unit definitions are substitutable for the gml:Definition element declared as part of the dictionary model.  A dictionary that contains only unit definitions and references to unit definitions is a units dictionary.

GML is an OGC Standard.
Copyright (c) 2007,2010 Open Geospatial Consortium.
To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .
		</documentation>
	</annotation>
	<include schemaLocation="gml.xsd"/>
	<include schemaLocation="dictionary.xsd"/>
	<element name="unitOfMeasure" type="gml:UnitOfMeasureType">
		<annotation>
			<documentation>The element gml:unitOfMeasure is a property element to refer to a unit of measure. This is an empty element which carries a reference to a unit of measure definition.</documentation>
		</annotation>
	</element>
	<complexType name="UnitOfMeasureType">
		<sequence/>
		<attribute name="uom" type="gml:UomIdentifier" use="required"/>
	</complexType>
	<element name="UnitDefinition" type="gml:UnitDefinitionType" substitutionGroup="gml:Definition">
		<annotation>
			<documentation>A gml:UnitDefinition is a general definition of a unit of measure. This generic element is used only for units for which no relationship with other units or units systems is known.
The content model of gml:UnitDefinition adds three additional properties to gml:Definition, gml:quantityType, gml:quantityTypeReference and gml:catalogSymbol.  
The gml:catalogSymbol property optionally gives the short symbol used for this unit. This element is usually used when the relationship of this unit to other units or units systems is unknown.</documentation>
		</annotation>
	</element>
	<complexType name="UnitDefinitionType">
		<complexContent>
			<extension base="gml:DefinitionType">
				<sequence>
					<element ref="gml:quantityType" minOccurs="0"/>
					<element ref="gml:quantityTypeReference" minOccurs="0"/>
					<element ref="gml:catalogSymbol" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<element name="quantityType" type="gml:StringOrRefType">
		<annotation>
			<documentation>The gml:quantityType property indicates the phenomenon to which the units apply. This element contains an informal description of the phenomenon or type of physical quantity that is measured or observed. When the physical quantity i...
The use of gml:quantityType for references to remote values is deprecated.</documentation>
		</annotation>
	</element>
	<element name="quantityTypeReference" type="gml:ReferenceType">
		<annotation>
			<documentation>The gml:quantityTypeReference property indicates the phenomenon to which the units apply. The content is a reference to a remote value.</documentation>
		</annotation>
	</element>
	<element name="catalogSymbol" type="gml:CodeType">
		<annotation>
			<documentation>The catalogSymbol is the preferred lexical symbol used for this unit of measure.
The codeSpace attribute in gml:CodeType identifies a namespace for the catalog symbol value, and might reference the external catalog. The string value in gml:CodeType contains the value of a symbol that should be unique within this catalog namespace...
		</annotation>
	</element>
	<element name="BaseUnit" type="gml:BaseUnitType" substitutionGroup="gml:UnitDefinition">
		<annotation>
			<documentation>A base unit is a unit of measure that cannot be derived by combination of other base units within a particular system of units.  For example, in the SI system of units, the base units are metre, kilogram, second, Ampere, Kelvin, mol...
gml:BaseUnit extends generic gml:UnitDefinition with the property gml:unitsSystem, which carries a reference to the units system to which this base unit is asserted to belong.  </documentation>
		</annotation>
	</element>
	<complexType name="BaseUnitType">

lib/Geo/GML/xsd/gml-3.2.1/units.xsd  view on Meta::CPAN

		<annotation>
			<documentation>Derived units are defined by combination of other units.  Derived units are used for quantities other than those corresponding to the base units, such as hertz (s-1) for frequency, Newton (kg.m/s2) for force.  Derived units based di...
The gml:DerivedUnit extends gml:UnitDefinition with the property gml:derivationUnitTerms.</documentation>
		</annotation>
	</element>
	<complexType name="DerivedUnitType">
		<complexContent>
			<extension base="gml:UnitDefinitionType">
				<sequence>
					<element ref="gml:derivationUnitTerm" maxOccurs="unbounded"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<element name="derivationUnitTerm" type="gml:DerivationUnitTermType">
		<annotation>
			<documentation>A set of gml:derivationUnitTerm elements describes a derived unit of measure.  Each element carries an integer exponent.  The terms are combined by raising each referenced unit to the power of its exponent and forming the product.
This unit term references another unit of measure (uom) and provides an integer exponent applied to that unit in defining the compound unit. The exponent may be positive or negative, but not zero.</documentation>
		</annotation>
	</element>
	<complexType name="DerivationUnitTermType">
		<complexContent>
			<extension base="gml:UnitOfMeasureType">
				<attribute name="exponent" type="integer"/>
			</extension>
		</complexContent>
	</complexType>
	<element name="ConventionalUnit" type="gml:ConventionalUnitType" substitutionGroup="gml:UnitDefinition">
		<annotation>
			<documentation>Conventional units that are neither base units nor defined by direct combination of base units are used in many application domains.  For example electronVolt for energy, feet and nautical miles for length.  In most cases there is a...
The gml:ConventionalUnit extends gml:UnitDefinition with a property that describes a conversion to a preferred unit for this physical quantity.  When the conversion is exact, the element gml:conversionToPreferredUnit should be used, or when the conve...
		</annotation>
	</element>
	<complexType name="ConventionalUnitType">
		<complexContent>
			<extension base="gml:UnitDefinitionType">
				<sequence>
					<choice>
						<element ref="gml:conversionToPreferredUnit"/>
						<element ref="gml:roughConversionToPreferredUnit"/>
					</choice>
					<element ref="gml:derivationUnitTerm" minOccurs="0" maxOccurs="unbounded"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<element name="conversionToPreferredUnit" type="gml:ConversionToPreferredUnitType">
		<annotation>
			<documentation>The elements gml:conversionToPreferredUnit and gml:roughConversionToPreferredUnit represent parameters used to convert conventional units to preferred units for this physical quantity type.  A preferred unit is either a Base Unit or...
		</annotation>
	</element>
	<element name="roughConversionToPreferredUnit" type="gml:ConversionToPreferredUnitType">
		<annotation>
			<documentation>The elements gml:conversionToPreferredUnit and gml:roughConversionToPreferredUnit represent parameters used to convert conventional units to preferred units for this physical quantity type.  A preferred unit is either a Base Unit or...
		</annotation>
	</element>
	<complexType name="ConversionToPreferredUnitType">
		<annotation>
			<documentation>The inherited attribute uom references the preferred unit that this conversion applies to. The conversion of a unit to the preferred unit for this physical quantity type is specified by an arithmetic conversion (scaling and/or offse...
-	gml:factor, which defines the scale factor, or
-	gml:formula, which defines a formula 
by which a value using the conventional unit of measure can be converted to obtain the corresponding value using the preferred unit of measure.  
The formula defines the parameters of a simple formula by which a value using the conventional unit of measure can be converted to the corresponding value using the preferred unit of measure. The formula element contains elements a, b, c and d, whose...
		</annotation>
		<complexContent>
			<extension base="gml:UnitOfMeasureType">
				<choice>
					<element name="factor" type="double"/>
					<element name="formula" type="gml:FormulaType"/>
				</choice>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="FormulaType">
		<sequence>
			<element name="a" type="double" minOccurs="0"/>
			<element name="b" type="double"/>
			<element name="c" type="double"/>
			<element name="d" type="double" minOccurs="0"/>
		</sequence>
	</complexType>
</schema>