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				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="TimePrimitivePropertyType">
		<annotation>
			<documentation>gml:TimePrimitivePropertyType provides a standard content model for associations between an arbitrary member of the substitution group whose head is gml:AbstractTimePrimitive and another object.</documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:AbstractTimePrimitive"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
		<attributeGroup ref="gml:OwnershipAttributeGroup"/>
	</complexType>
	<element name="validTime" type="gml:TimePrimitivePropertyType">
		<annotation>
			<documentation>gml:validTime is a convenience property element.</documentation>
		</annotation>
	</element>
	<complexType name="RelatedTimeType">
		<annotation>
			<documentation>gml:RelatedTimeType provides a content model for indicating the relative position of an arbitrary member of the substitution group whose head is gml:AbstractTimePrimitive. It extends the generic gml:TimePrimitivePropertyType with an...
		</annotation>
		<complexContent>
			<extension base="gml:TimePrimitivePropertyType">
				<attribute name="relativePosition">
					<simpleType>
						<restriction base="string">
							<enumeration value="Before"/>
							<enumeration value="After"/>
							<enumeration value="Begins"/>
							<enumeration value="Ends"/>
							<enumeration value="During"/>
							<enumeration value="Equals"/>
							<enumeration value="Contains"/>
							<enumeration value="Overlaps"/>
							<enumeration value="Meets"/>
							<enumeration value="OverlappedBy"/>
							<enumeration value="MetBy"/>
							<enumeration value="BegunBy"/>
							<enumeration value="EndedBy"/>
						</restriction>
					</simpleType>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<element name="AbstractTimeComplex" type="gml:AbstractTimeComplexType" abstract="true" substitutionGroup="gml:AbstractTimeObject">
		<annotation>
			<documentation>gml:AbstractTimeComplex is an aggregation of temporal primitives and acts as the head of a substitution group for temporal complexes.</documentation>
		</annotation>
	</element>
	<complexType name="AbstractTimeComplexType" abstract="true">
		<complexContent>
			<extension base="gml:AbstractTimeObjectType"/>
		</complexContent>
	</complexType>
	<element name="AbstractTimeGeometricPrimitive" type="gml:AbstractTimeGeometricPrimitiveType" abstract="true" substitutionGroup="gml:AbstractTimePrimitive">
		<annotation>
			<documentation>gml:TimeGeometricPrimitive acts as the head of a substitution group for geometric temporal primitives.
A temporal geometry shall be associated with a temporal reference system through the frame attribute that provides a URI reference that identifies a description of the reference system. Following ISO 19108, the Gregorian calendar with UTC is the defa...
The two geometric primitives in the temporal dimension are the instant and the period. GML components are defined to support these as follows.</documentation>
		</annotation>
	</element>
	<complexType name="AbstractTimeGeometricPrimitiveType" abstract="true">
		<complexContent>
			<extension base="gml:AbstractTimePrimitiveType">
				<attribute name="frame" type="anyURI" default="#ISO-8601"/>
			</extension>
		</complexContent>
	</complexType>
	<element name="TimeInstant" type="gml:TimeInstantType" substitutionGroup="gml:AbstractTimeGeometricPrimitive">
		<annotation>
			<documentation>gml:TimeInstant acts as a zero-dimensional geometric primitive that represents an identifiable position in time.</documentation>
		</annotation>
	</element>
	<complexType name="TimeInstantType" final="#all">
		<complexContent>
			<extension base="gml:AbstractTimeGeometricPrimitiveType">
				<sequence>
					<element ref="gml:timePosition"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="TimeInstantPropertyType">
		<annotation>
			<documentation>gml:TimeInstantPropertyType provides for associating a gml:TimeInstant with an object.</documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:TimeInstant"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
		<attributeGroup ref="gml:OwnershipAttributeGroup"/>
	</complexType>
	<element name="TimePeriod" type="gml:TimePeriodType" substitutionGroup="gml:AbstractTimeGeometricPrimitive">
		<annotation>
			<documentation>gml:TimePeriod acts as a one-dimensional geometric primitive that represents an identifiable extent in time.
The location in of a gml:TimePeriod is described by the temporal positions of the instants at which it begins and ends. The length of the period is equal to the temporal distance between the two bounding temporal positions. 
Both beginning and end may be described in terms of their direct position using gml:TimePositionType which is an XML Schema simple content type, or by reference to an indentifiable time instant using gml:TimeInstantPropertyType.
Alternatively a limit of a gml:TimePeriod may use the conventional GML property model to make a reference to a time instant described elsewhere, or a limit may be indicated as a direct position.</documentation>
		</annotation>
	</element>
	<complexType name="TimePeriodType">
		<complexContent>
			<extension base="gml:AbstractTimeGeometricPrimitiveType">
				<sequence>
					<choice>
						<element name="beginPosition" type="gml:TimePositionType"/>
						<element name="begin" type="gml:TimeInstantPropertyType"/>
					</choice>
					<choice>
						<element name="endPosition" type="gml:TimePositionType"/>
						<element name="end" type="gml:TimeInstantPropertyType"/>
					</choice>
					<group ref="gml:timeLength" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<complexType name="TimePeriodPropertyType">
		<annotation>
			<documentation>gml:TimePeriodPropertyType provides for associating a gml:TimePeriod with an object.</documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:TimePeriod"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
		<attributeGroup ref="gml:OwnershipAttributeGroup"/>
	</complexType>
	<complexType name="TimePositionType" final="#all">
		<annotation>
			<documentation>The method for identifying a temporal position is specific to each temporal reference system.  gml:TimePositionType supports the description of temporal position according to the subtypes described in ISO 19108.
Values based on calendars and clocks use lexical formats that are based on ISO 8601, as described in XML Schema Part 2:2001. A decimal value may be used with coordinate systems such as GPS time or UNIX time. A URI may be used to provide a reference t...
In common with many of the components modelled as data types in the ISO 19100 series of International Standards, the corresponding GML component has simple content. However, the content model gml:TimePositionType is defined in several steps.
Three XML attributes appear on gml:TimePositionType:
A time value shall be associated with a temporal reference system through the frame attribute that provides a URI reference that identifies a description of the reference system. Following ISO 19108, the Gregorian calendar with UTC is the default ref...
For time values using a calendar containing more than one era, the (optional) calendarEraName attribute provides the name of the calendar era.  
Inexact temporal positions may be expressed using the optional indeterminatePosition attribute.  This takes a value from an enumeration.</documentation>
		</annotation>
		<simpleContent>
			<extension base="gml:TimePositionUnion">
				<attribute name="frame" type="anyURI" default="#ISO-8601"/>
				<attribute name="calendarEraName" type="string"/>
				<attribute name="indeterminatePosition" type="gml:TimeIndeterminateValueType"/>
			</extension>
		</simpleContent>
	</complexType>
	<simpleType name="TimeIndeterminateValueType">
		<annotation>
			<documentation>These values are interpreted as follows: 
-	"unknown" indicates that no specific value for temporal position is provided.
-	"now" indicates that the specified value shall be replaced with the current temporal position whenever the value is accessed.
-	"before" indicates that the actual temporal position is unknown, but it is known to be before the specified value.
-	"after" indicates that the actual temporal position is unknown, but it is known to be after the specified value.
A value for indeterminatePosition may 
-	be used either alone, or 
-	qualify a specific value for temporal position.</documentation>
		</annotation>
		<restriction base="string">
			<enumeration value="after"/>
			<enumeration value="before"/>
			<enumeration value="now"/>
			<enumeration value="unknown"/>
		</restriction>
	</simpleType>
	<simpleType name="TimePositionUnion">
		<annotation>
			<documentation>The simple type gml:TimePositionUnion is a union of XML Schema simple types which instantiate the subtypes for temporal position described in ISO 19108.
 An ordinal era may be referenced via URI.  A decimal value may be used to indicate the distance from the scale origin .  time is used for a position that recurs daily (see ISO 19108:2002 5.4.4.2).
 Finally, calendar and clock forms that support the representation of time in systems based on years, months, days, hours, minutes and seconds, in a notation following ISO 8601, are assembled by gml:CalDate</documentation>
		</annotation>
		<union memberTypes="gml:CalDate time dateTime anyURI decimal"/>
	</simpleType>
	<simpleType name="CalDate">
		<union memberTypes="date gYearMonth gYear"/>
	</simpleType>
	<element name="timePosition" type="gml:TimePositionType">
		<annotation>
			<documentation>This element is used directly as a property of gml:TimeInstant (see 15.2.2.3), and may also be used in application schemas.</documentation>
		</annotation>
	</element>
	<group name="timeLength">
		<annotation>
			<documentation>The length of a time period.</documentation>
		</annotation>
		<choice>
			<element ref="gml:duration"/>
			<element ref="gml:timeInterval"/>
		</choice>
	</group>
	<element name="duration" type="duration">
		<annotation>
			<documentation>gml:duration conforms to the ISO 8601 syntax for temporal length as implemented by the XML Schema duration type.</documentation>
		</annotation>
	</element>
	<element name="timeInterval" type="gml:TimeIntervalLengthType">
		<annotation>
			<documentation> gml:timeInterval conforms to ISO 11404 which is based on floating point values for temporal length.
ISO 11404 syntax specifies the use of a positiveInteger together with appropriate values for radix and factor. The resolution of the time interval is to one radix ^(-factor) of the specified time unit.
The value of the unit is either selected from the units for time intervals from ISO 31-1:1992, or is another suitable unit.  The encoding is defined for GML in gml:TimeUnitType. The second component of this union type provides a method for indicating...
		</annotation>
	</element>
	<complexType name="TimeIntervalLengthType" final="#all">
		<simpleContent>
			<extension base="decimal">
				<attribute name="unit" type="gml:TimeUnitType" use="required"/>
				<attribute name="radix" type="positiveInteger"/>
				<attribute name="factor" type="integer"/>
			</extension>
		</simpleContent>
	</complexType>
	<simpleType name="TimeUnitType">
		<union>
			<simpleType>
				<restriction base="string">
					<enumeration value="year"/>
					<enumeration value="month"/>
					<enumeration value="day"/>
					<enumeration value="hour"/>
					<enumeration value="minute"/>
					<enumeration value="second"/>
				</restriction>
			</simpleType>
			<simpleType>
				<restriction base="string">
					<pattern value="other:\w{2,}"/>
				</restriction>
			</simpleType>
		</union>
	</simpleType>