Schema documentation tunnel

Schema Document Properties

Target Namespace

http://www.opengis.net/citygml/tunnel/3.0

Version

3.0.0

Element and Attribute Namespaces

Global element and attribute declarations belong to this schema's target namespace.
By default, local element declarations belong to this schema's target namespace.
By default, local attribute declarations have no namespace.

Schema Composition

This schema imports schema(s) from the following namespace(s):
- http://www.opengis.net/citygml/3.0 (at ./core.xsd)
- http://www.opengis.net/citygml/construction/3.0 (at ./construction.xsd)
- http://www.opengis.net/gml/3.2 (at http://schemas.opengis.net/gml/3.2.1/gml.xsd)

Documentation: The Tunnel module supports representation of thematic and spatial aspects of tunnels, tunnel parts, tunnel installations, and interior tunnel structures.

Declared Namespaces:

Prefix: Namespace
Default namespace: http://www.w3.org/2001/XMLSchema
xml: http://www.w3.org/XML/1998/namespace
tun: http://www.opengis.net/citygml/tunnel/3.0
gml: http://www.opengis.net/gml/3.2
core: http://www.opengis.net/citygml/3.0
con: http://www.opengis.net/citygml/construction/3.0

Schema Component Representation

<schema elementFormDefault="qualified" targetNamespace="http://www.opengis.net/citygml/tunnel/3.0" version="3.0.0">
   <import namespace="http://www.opengis.net/citygml/3.0" schemaLocation="./core.xsd"/>
   <import namespace="http://www.opengis.net/citygml/construction/3.0" schemaLocation="./construction.xsd"/>
   <import namespace="http://www.opengis.net/gml/3.2" schemaLocation="http://schemas.opengis.net/gml/3.2.1/gml.xsd"/>
...
</schema>

Elements

Element: ADEOfAbstractTunnel

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfAbstractTunnelType
Abstract: yes

Documentation: ADEOfAbstractTunnel acts as a hook to define properties within an ADE that are to be added to AbstractTunnel.

XML Instance Representation

<tun:ADEOfAbstractTunnel/>

Schema Component Representation

<element name="ADEOfAbstractTunnel" type="tun:ADEOfAbstractTunnelType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: ADEOfHollowSpace

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfHollowSpaceType
Abstract: yes

Documentation: ADEOfHollowSpace acts as a hook to define properties within an ADE that are to be added to a HollowSpace.

XML Instance Representation

<tun:ADEOfHollowSpace/>

Schema Component Representation

<element name="ADEOfHollowSpace" type="tun:ADEOfHollowSpaceType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: ADEOfTunnel

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfTunnelType
Abstract: yes

Documentation: ADEOfTunnel acts as a hook to define properties within an ADE that are to be added to a Tunnel.

XML Instance Representation

<tun:ADEOfTunnel/>

Schema Component Representation

<element name="ADEOfTunnel" type="tun:ADEOfTunnelType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: ADEOfTunnelConstructiveElement

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfTunnelConstructiveElementType
Abstract: yes

Documentation: ADEOfTunnelConstructiveElement acts as a hook to define properties within an ADE that are to be added to a TunnelConstructiveElement.

XML Instance Representation

<tun:ADEOfTunnelConstructiveElement/>

Schema Component Representation

<element name="ADEOfTunnelConstructiveElement" type="tun:ADEOfTunnelConstructiveElementType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: ADEOfTunnelFurniture

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfTunnelFurnitureType
Abstract: yes

Documentation: ADEOfTunnelFurniture acts as a hook to define properties within an ADE that are to be added to a TunnelFurniture.

XML Instance Representation

<tun:ADEOfTunnelFurniture/>

Schema Component Representation

<element name="ADEOfTunnelFurniture" type="tun:ADEOfTunnelFurnitureType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: ADEOfTunnelInstallation

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfTunnelInstallationType
Abstract: yes

Documentation: ADEOfTunnelInstallation acts as a hook to define properties within an ADE that are to be added to a TunnelInstallation.

XML Instance Representation

<tun:ADEOfTunnelInstallation/>

Schema Component Representation

<element name="ADEOfTunnelInstallation" type="tun:ADEOfTunnelInstallationType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: ADEOfTunnelPart

Type hierarchy:

This element can be used wherever the following element is referenced: gml:AbstractObject

Type: tun:ADEOfTunnelPartType
Abstract: yes

Documentation: ADEOfTunnelPart acts as a hook to define properties within an ADE that are to be added to a TunnelPart.

XML Instance Representation

<tun:ADEOfTunnelPart/>

Schema Component Representation

<element name="ADEOfTunnelPart" type="tun:ADEOfTunnelPartType" abstract="true" substitutionGroup="gml:AbstractObject"/>

Element: AbstractTunnel

Type hierarchy:

This element can be used wherever the following element is referenced: con:AbstractConstruction The following elements can be used wherever this element is referenced: Tunnel TunnelPart

Type: tun:AbstractTunnelType
Abstract: yes

Documentation: AbstractTunnel is an abstract superclass representing the common attributes and associations of the classes Tunnel and TunnelPart.

XML Instance Representation

<tun:AbstractTunnel>
   <!-- 'con:AbstractConstructionType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelConstructiveElement
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
      End Sequence
   </tun:tunnelConstructiveElement>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:hollowSpace
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:HollowSpace> ... </tun:HollowSpace> [1]
      End Sequence
   </tun:hollowSpace>
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:adeOfAbstractTunnel> tun:ADEOfAbstractTunnelPropertyType </tun:adeOfAbstractTunnel> [0..*] 
</tun:AbstractTunnel>

Schema Component Representation

<element name="AbstractTunnel" type="tun:AbstractTunnelType" abstract="true" substitutionGroup="con:AbstractConstruction"/>

Element: HollowSpace

Type hierarchy:

This element can be used wherever the following element is referenced: core:AbstractUnoccupiedSpace

Type: tun:HollowSpaceType

Documentation: A HollowSpace is a space within a Tunnel or TunnelPart intended for certain functions (e.g. transport or passage ways, service rooms, emergency shelters). A HollowSpace is bounded physically and/or virtually (e.g. by ClosureSurfaces or GenericSurfaces).

XML Instance Representation

<tun:HollowSpace>
   <!-- 'core:AbstractUnoccupiedSpaceType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:adeOfHollowSpace> tun:ADEOfHollowSpacePropertyType </tun:adeOfHollowSpace> [0..*] 
</tun:HollowSpace>

Schema Component Representation

<element name="HollowSpace" type="tun:HollowSpaceType" substitutionGroup="core:AbstractUnoccupiedSpace"/>

Element: Tunnel

Type hierarchy:

This element can be used wherever the following element is referenced: tun:AbstractTunnel

Type: tun:TunnelType

Documentation: A Tunnel represents a horizontal or sloping enclosed passage way of a certain length, mainly underground or underwater. [cf. ISO 6707-1]

XML Instance Representation

<tun:Tunnel>
   <!-- 'con:AbstractConstructionType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelConstructiveElement
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
      End Sequence
   </tun:tunnelConstructiveElement>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:hollowSpace
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:HollowSpace> ... </tun:HollowSpace> [1]
      End Sequence
   </tun:hollowSpace>
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:adeOfAbstractTunnel> tun:ADEOfAbstractTunnelPropertyType </tun:adeOfAbstractTunnel> [0..*] 
   <tun:tunnelPart
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelPart> ... </tun:TunnelPart> [1]
      End Sequence
   </tun:tunnelPart>
   <tun:adeOfTunnel> tun:ADEOfTunnelPropertyType </tun:adeOfTunnel> [0..*] 
</tun:Tunnel>

Schema Component Representation

<element name="Tunnel" type="tun:TunnelType" substitutionGroup="tun:AbstractTunnel"/>

Element: TunnelConstructiveElement

Type hierarchy:

This element can be used wherever the following element is referenced: con:AbstractConstructiveElement

Type: tun:TunnelConstructiveElementType

Documentation: A TunnelConstructiveElement is an element of a Tunnel which is essential from a structural point of view. Examples are walls, slabs, beams.

XML Instance Representation

<tun:TunnelConstructiveElement>
   <!-- 'con:AbstractConstructiveElementType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:adeOfTunnelConstructiveElement> tun:ADEOfTunnelConstructiveElementPropertyType </tun:adeOfTunnelConstructiveElement> [0..*] 
</tun:TunnelConstructiveElement>

Schema Component Representation

<element name="TunnelConstructiveElement" type="tun:TunnelConstructiveElementType" substitutionGroup="con:AbstractConstructiveElement"/>

Element: TunnelFurniture

Type hierarchy:

This element can be used wherever the following element is referenced: con:AbstractFurniture

Type: tun:TunnelFurnitureType

Documentation: A TunnelFurniture is an equipment for occupant use, usually not fixed to the tunnel. [cf. ISO 6707-1]

XML Instance Representation

<tun:TunnelFurniture>
   <!-- 'con:AbstractFurnitureType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:adeOfTunnelFurniture> tun:ADEOfTunnelFurniturePropertyType </tun:adeOfTunnelFurniture> [0..*] 
</tun:TunnelFurniture>

Schema Component Representation

<element name="TunnelFurniture" type="tun:TunnelFurnitureType" substitutionGroup="con:AbstractFurniture"/>

Element: TunnelInstallation

Type hierarchy:

This element can be used wherever the following element is referenced: con:AbstractInstallation

Type: tun:TunnelInstallationType

Documentation: A TunnelInstallation is a permanent part of a Tunnel (inside and/or outside) which does not have the significance of a TunnelPart. In contrast to TunnelConstructiveElement, a TunnelInstallation is not essential from a structural point of view. Examples are stairs, antennas or railings.

XML Instance Representation

<tun:TunnelInstallation>
   <!-- 'con:AbstractInstallationType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:adeOfTunnelInstallation> tun:ADEOfTunnelInstallationPropertyType </tun:adeOfTunnelInstallation> [0..*] 
</tun:TunnelInstallation>

Schema Component Representation

<element name="TunnelInstallation" type="tun:TunnelInstallationType" substitutionGroup="con:AbstractInstallation"/>

Element: TunnelPart

Type hierarchy:

This element can be used wherever the following element is referenced: tun:AbstractTunnel

Type: tun:TunnelPartType

Documentation: A TunnelPart is a physical or functional subdivision of a Tunnel. It would be considered a Tunnel, if it were not part of a collection of other TunnelParts.

XML Instance Representation

<tun:TunnelPart>
   <!-- 'con:AbstractConstructionType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelConstructiveElement
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
      End Sequence
   </tun:tunnelConstructiveElement>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:hollowSpace
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:HollowSpace> ... </tun:HollowSpace> [1]
      End Sequence
   </tun:hollowSpace>
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:adeOfAbstractTunnel> tun:ADEOfAbstractTunnelPropertyType </tun:adeOfAbstractTunnel> [0..*] 
   <tun:adeOfTunnelPart> tun:ADEOfTunnelPartPropertyType </tun:adeOfTunnelPart> [0..*] 
</tun:TunnelPart>

Schema Component Representation

<element name="TunnelPart" type="tun:TunnelPartType" substitutionGroup="tun:AbstractTunnel"/>

Complex Types

Complex Type: ADEOfAbstractTunnelPropertyType

XML Instance Representation

<...>
   <tun:ADEOfAbstractTunnel> ... </tun:ADEOfAbstractTunnel> [1]
</...>

Schema Component Representation

<complexType name="ADEOfAbstractTunnelPropertyType">
   <sequence>
      <element ref="tun:ADEOfAbstractTunnel"/>
   </sequence>
</complexType>

Complex Type: ADEOfAbstractTunnelType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfAbstractTunnelType" abstract="true">
   <sequence/>
</complexType>

Complex Type: ADEOfHollowSpacePropertyType

XML Instance Representation

<...>
   <tun:ADEOfHollowSpace> ... </tun:ADEOfHollowSpace> [1]
</...>

Schema Component Representation

<complexType name="ADEOfHollowSpacePropertyType">
   <sequence>
      <element ref="tun:ADEOfHollowSpace"/>
   </sequence>
</complexType>

Complex Type: ADEOfHollowSpaceType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfHollowSpaceType" abstract="true">
   <sequence/>
</complexType>

Complex Type: ADEOfTunnelConstructiveElementPropertyType

XML Instance Representation

<...>
   <tun:ADEOfTunnelConstructiveElement> ... </tun:ADEOfTunnelConstructiveElement> [1]
</...>

Schema Component Representation

<complexType name="ADEOfTunnelConstructiveElementPropertyType">
   <sequence>
      <element ref="tun:ADEOfTunnelConstructiveElement"/>
   </sequence>
</complexType>

Complex Type: ADEOfTunnelConstructiveElementType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfTunnelConstructiveElementType" abstract="true">
   <sequence/>
</complexType>

Complex Type: ADEOfTunnelFurniturePropertyType

XML Instance Representation

<...>
   <tun:ADEOfTunnelFurniture> ... </tun:ADEOfTunnelFurniture> [1]
</...>

Schema Component Representation

<complexType name="ADEOfTunnelFurniturePropertyType">
   <sequence>
      <element ref="tun:ADEOfTunnelFurniture"/>
   </sequence>
</complexType>

Complex Type: ADEOfTunnelFurnitureType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfTunnelFurnitureType" abstract="true">
   <sequence/>
</complexType>

Complex Type: ADEOfTunnelInstallationPropertyType

XML Instance Representation

<...>
   <tun:ADEOfTunnelInstallation> ... </tun:ADEOfTunnelInstallation> [1]
</...>

Schema Component Representation

<complexType name="ADEOfTunnelInstallationPropertyType">
   <sequence>
      <element ref="tun:ADEOfTunnelInstallation"/>
   </sequence>
</complexType>

Complex Type: ADEOfTunnelInstallationType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfTunnelInstallationType" abstract="true">
   <sequence/>
</complexType>

Complex Type: ADEOfTunnelPartPropertyType

XML Instance Representation

<...>
   <tun:ADEOfTunnelPart> ... </tun:ADEOfTunnelPart> [1]
</...>

Schema Component Representation

<complexType name="ADEOfTunnelPartPropertyType">
   <sequence>
      <element ref="tun:ADEOfTunnelPart"/>
   </sequence>
</complexType>

Complex Type: ADEOfTunnelPartType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfTunnelPartType" abstract="true">
   <sequence/>
</complexType>

Complex Type: ADEOfTunnelPropertyType

XML Instance Representation

<...>
   <tun:ADEOfTunnel> ... </tun:ADEOfTunnel> [1]
</...>

Schema Component Representation

<complexType name="ADEOfTunnelPropertyType">
   <sequence>
      <element ref="tun:ADEOfTunnel"/>
   </sequence>
</complexType>

Complex Type: ADEOfTunnelType

Properties:

Abstract: yes

XML Instance Representation

<.../>

Schema Component Representation

<complexType name="ADEOfTunnelType" abstract="true">
   <sequence/>
</complexType>

Complex Type: AbstractTunnelPropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:AbstractTunnel> ... </tun:AbstractTunnel> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="AbstractTunnelPropertyType">
   <sequence minOccurs="0">
      <element ref="tun:AbstractTunnel"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: AbstractTunnelType

Type hierarchy:

Super-types:

con:AbstractConstructionType < AbstractTunnelType (by extension)

Sub-types:

TunnelType (by extension)
TunnelPartType (by extension)

Properties:

Abstract: yes

XML Instance Representation

<...>
   <!-- 'con:AbstractConstructionType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelConstructiveElement
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
      End Sequence
   </tun:tunnelConstructiveElement>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:hollowSpace
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:HollowSpace> ... </tun:HollowSpace> [1]
      End Sequence
   </tun:hollowSpace>
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:adeOfAbstractTunnel> tun:ADEOfAbstractTunnelPropertyType </tun:adeOfAbstractTunnel> [0..*] 
</...>

Schema Component Representation

<complexType name="AbstractTunnelType" abstract="true">
   <complexContent>
      <extension base="con:AbstractConstructionType">
         <sequence>
            <element name="class" type="gml:CodeType" minOccurs="0"/>
            <element name="function" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="usage" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="tunnelConstructiveElement" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:TunnelConstructiveElement"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="tunnelInstallation" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:TunnelInstallation"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="hollowSpace" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:HollowSpace"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="tunnelFurniture" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:TunnelFurniture"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="adeOfAbstractTunnel" type="tun:ADEOfAbstractTunnelPropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Complex Type: HollowSpacePropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:HollowSpace> ... </tun:HollowSpace> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="HollowSpacePropertyType">
   <sequence minOccurs="0">
      <element ref="tun:HollowSpace"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: HollowSpaceType

Type hierarchy:

Super-types:: core:AbstractUnoccupiedSpaceType < HollowSpaceType (by extension)

XML Instance Representation

<...>
   <!-- 'core:AbstractUnoccupiedSpaceType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:adeOfHollowSpace> tun:ADEOfHollowSpacePropertyType </tun:adeOfHollowSpace> [0..*] 
</...>

Schema Component Representation

<complexType name="HollowSpaceType">
   <complexContent>
      <extension base="core:AbstractUnoccupiedSpaceType">
         <sequence>
            <element name="class" type="gml:CodeType" minOccurs="0"/>
            <element name="function" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="usage" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="tunnelFurniture" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:TunnelFurniture"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="tunnelInstallation" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:TunnelInstallation"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="adeOfHollowSpace" type="tun:ADEOfHollowSpacePropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Complex Type: TunnelConstructiveElementPropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="TunnelConstructiveElementPropertyType">
   <sequence minOccurs="0">
      <element ref="tun:TunnelConstructiveElement"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: TunnelConstructiveElementType

Type hierarchy:

Super-types:: con:AbstractConstructiveElementType < TunnelConstructiveElementType (by extension)

XML Instance Representation

<...>
   <!-- 'con:AbstractConstructiveElementType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:adeOfTunnelConstructiveElement> tun:ADEOfTunnelConstructiveElementPropertyType </tun:adeOfTunnelConstructiveElement> [0..*] 
</...>

Schema Component Representation

<complexType name="TunnelConstructiveElementType">
   <complexContent>
      <extension base="con:AbstractConstructiveElementType">
         <sequence>
            <element name="class" type="gml:CodeType" minOccurs="0"/>
            <element name="function" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="usage" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="adeOfTunnelConstructiveElement" type="tun:ADEOfTunnelConstructiveElementPropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Complex Type: TunnelFurniturePropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="TunnelFurniturePropertyType">
   <sequence minOccurs="0">
      <element ref="tun:TunnelFurniture"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: TunnelFurnitureType

Type hierarchy:

Super-types:: con:AbstractFurnitureType < TunnelFurnitureType (by extension)

XML Instance Representation

<...>
   <!-- 'con:AbstractFurnitureType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:adeOfTunnelFurniture> tun:ADEOfTunnelFurniturePropertyType </tun:adeOfTunnelFurniture> [0..*] 
</...>

Schema Component Representation

<complexType name="TunnelFurnitureType">
   <complexContent>
      <extension base="con:AbstractFurnitureType">
         <sequence>
            <element name="class" type="gml:CodeType" minOccurs="0"/>
            <element name="function" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="usage" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="adeOfTunnelFurniture" type="tun:ADEOfTunnelFurniturePropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Complex Type: TunnelInstallationPropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="TunnelInstallationPropertyType">
   <sequence minOccurs="0">
      <element ref="tun:TunnelInstallation"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: TunnelInstallationType

Type hierarchy:

Super-types:: con:AbstractInstallationType < TunnelInstallationType (by extension)

XML Instance Representation

<...>
   <!-- 'con:AbstractInstallationType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:adeOfTunnelInstallation> tun:ADEOfTunnelInstallationPropertyType </tun:adeOfTunnelInstallation> [0..*] 
</...>

Schema Component Representation

<complexType name="TunnelInstallationType">
   <complexContent>
      <extension base="con:AbstractInstallationType">
         <sequence>
            <element name="class" type="gml:CodeType" minOccurs="0"/>
            <element name="function" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="usage" type="gml:CodeType" maxOccurs="unbounded" minOccurs="0"/>
            <element name="adeOfTunnelInstallation" type="tun:ADEOfTunnelInstallationPropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Complex Type: TunnelPartPropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:TunnelPart> ... </tun:TunnelPart> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="TunnelPartPropertyType">
   <sequence minOccurs="0">
      <element ref="tun:TunnelPart"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: TunnelPartType

Type hierarchy:

Super-types:: con:AbstractConstructionType < AbstractTunnelType (by extension) < TunnelPartType (by extension)

XML Instance Representation

<...>
   <!-- 'con:AbstractConstructionType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelConstructiveElement
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
      End Sequence
   </tun:tunnelConstructiveElement>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:hollowSpace
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:HollowSpace> ... </tun:HollowSpace> [1]
      End Sequence
   </tun:hollowSpace>
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:adeOfAbstractTunnel> tun:ADEOfAbstractTunnelPropertyType </tun:adeOfAbstractTunnel> [0..*] 
   <tun:adeOfTunnelPart> tun:ADEOfTunnelPartPropertyType </tun:adeOfTunnelPart> [0..*] 
</...>

Schema Component Representation

<complexType name="TunnelPartType">
   <complexContent>
      <extension base="tun:AbstractTunnelType">
         <sequence>
            <element name="adeOfTunnelPart" type="tun:ADEOfTunnelPartPropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Complex Type: TunnelPropertyType

XML Instance Representation

<...
Attribute group reference (not shown): gml:AssociationAttributeGroup
Attribute group reference (not shown): gml:OwnershipAttributeGroup
>
   Start Sequence [0..1]
      <tun:Tunnel> ... </tun:Tunnel> [1]
   End Sequence
</...>

Schema Component Representation

<complexType name="TunnelPropertyType">
   <sequence minOccurs="0">
      <element ref="tun:Tunnel"/>
   </sequence>
   <attributeGroup ref="gml:AssociationAttributeGroup"/>
   <attributeGroup ref="gml:OwnershipAttributeGroup"/>
</complexType>

Complex Type: TunnelType

Type hierarchy:

Super-types:: con:AbstractConstructionType < AbstractTunnelType (by extension) < TunnelType (by extension)

XML Instance Representation

<...>
   <!-- 'con:AbstractConstructionType' super type was not found in this schema. Some elements and attributes may be missing. -->
   <tun:class> gml:CodeType </tun:class> [0..1] 
   <tun:function> gml:CodeType </tun:function> [0..*] 
   <tun:usage> gml:CodeType </tun:usage> [0..*] 
   <tun:tunnelConstructiveElement
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelConstructiveElement> ... </tun:TunnelConstructiveElement> [1]
      End Sequence
   </tun:tunnelConstructiveElement>
   <tun:tunnelInstallation
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelInstallation> ... </tun:TunnelInstallation> [1]
      End Sequence
   </tun:tunnelInstallation>
   <tun:hollowSpace
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:HollowSpace> ... </tun:HollowSpace> [1]
      End Sequence
   </tun:hollowSpace>
   <tun:tunnelFurniture
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelFurniture> ... </tun:TunnelFurniture> [1]
      End Sequence
   </tun:tunnelFurniture>
   <tun:adeOfAbstractTunnel> tun:ADEOfAbstractTunnelPropertyType </tun:adeOfAbstractTunnel> [0..*] 
   <tun:tunnelPart
Attribute group reference (not shown): gml:AssociationAttributeGroup
   > [0..*]  
      <!-- 'gml:AbstractFeatureMemberType' super type was not found in this schema. Some elements and attributes may be missing. -->
      Start Sequence [0..1]
         <tun:TunnelPart> ... </tun:TunnelPart> [1]
      End Sequence
   </tun:tunnelPart>
   <tun:adeOfTunnel> tun:ADEOfTunnelPropertyType </tun:adeOfTunnel> [0..*] 
</...>

Schema Component Representation

<complexType name="TunnelType">
   <complexContent>
      <extension base="tun:AbstractTunnelType">
         <sequence>
            <element name="tunnelPart" maxOccurs="unbounded" minOccurs="0">
               <complexType>
                  <complexContent>
                     <extension base="gml:AbstractFeatureMemberType">
                        <sequence minOccurs="0">
                           <element ref="tun:TunnelPart"/>
                        </sequence>
                        <attributeGroup ref="gml:AssociationAttributeGroup"/>
                     </extension>
                  </complexContent>
               </complexType>
            </element>
            <element name="adeOfTunnel" type="tun:ADEOfTunnelPropertyType" maxOccurs="unbounded" minOccurs="0"/>
         </sequence>
      </extension>
   </complexContent>
</complexType>

Abstract (Applies to complex type definitions and element declarations). An abstract element or complex type cannot used to validate an element instance. If there is a reference to an abstract element, only element declarations that can substitute the abstract element can be used to validate the instance. For references to abstract type definitions, only derived types can be used.

All Model Group Child elements can be provided in any order in instances. See: http://www.w3.org/TR/xmlschema-1/#element-all.

Choice Model Group Only one from the list of child elements and model groups can be provided in instances. See: http://www.w3.org/TR/xmlschema-1/#element-choice.

Collapse Whitespace Policy Replace tab, line feed, and carriage return characters with space character (Unicode character 32). Then, collapse contiguous sequences of space characters into single space character, and remove leading and trailing space characters.

Disallowed Substitutions (Applies to element declarations). If substitution is specified, then substitution group members cannot be used in place of the given element declaration to validate element instances. If derivation methods, e.g. extension, restriction, are specified, then the given element declaration will not validate element instances that have types derived from the element declaration's type using the specified derivation methods. Normally, element instances can override their declaration's type by specifying an xsi:type attribute.

Key Constraint Like Uniqueness Constraint, but additionally requires that the specified value(s) must be provided. See: http://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions.

Key Reference Constraint Ensures that the specified value(s) must match value(s) from a Key Constraint or Uniqueness Constraint. See: http://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions.

Model Group Groups together element content, specifying the order in which the element content can occur and the number of times the group of element content may be repeated. See: http://www.w3.org/TR/xmlschema-1/#Model_Groups.

Nillable (Applies to element declarations). If an element declaration is nillable, instances can use the xsi:nil attribute. The xsi:nil attribute is the boolean attribute, nil, from the http://www.w3.org/2001/XMLSchema-instance namespace. If an element instance has an xsi:nil attribute set to true, it can be left empty, even though its element declaration may have required content.

Notation A notation is used to identify the format of a piece of data. Values of elements and attributes that are of type, NOTATION, must come from the names of declared notations. See: http://www.w3.org/TR/xmlschema-1/#cNotation_Declarations.

Preserve Whitespace Policy Preserve whitespaces exactly as they appear in instances.

Prohibited Derivations (Applies to type definitions). Derivation methods that cannot be used to create sub-types from a given type definition.

Prohibited Substitutions (Applies to complex type definitions). Prevents sub-types that have been derived using the specified derivation methods from validating element instances in place of the given type definition.

Replace Whitespace Policy Replace tab, line feed, and carriage return characters with space character (Unicode character 32).

Sequence Model Group Child elements and model groups must be provided in the specified order in instances. See: http://www.w3.org/TR/xmlschema-1/#element-sequence.

Substitution Group Elements that are members of a substitution group can be used wherever the head element of the substitution group is referenced.

Substitution Group Exclusions (Applies to element declarations). Prohibits element declarations from nominating themselves as being able to substitute a given element declaration, if they have types that are derived from the original element's type using the specified derivation methods.

Target Namespace The target namespace identifies the namespace that components in this schema belongs to. If no target namespace is provided, then the schema components do not belong to any namespace.

Uniqueness Constraint Ensures uniqueness of an element/attribute value, or a combination of values, within a specified scope. See: http://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions.