XML Schema Documentation

Table of Contents

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Schema Document Properties

Target Namespace http://www.astrogrid.org/schema/CEAImplementation/v1
Version 0.2
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):

Declared Namespaces

Prefix Namespace
xml http://www.w3.org/XML/1998/namespace
ceapd http://www.astrogrid.org/schema/AGParameterDefinition/v1
ceab http://www.astrogrid.org/schema/CommonExecutionArchitectureBase/v1
xs http://www.w3.org/2001/XMLSchema
ceaimp http://www.astrogrid.org/schema/CEAImplementation/v1
Schema Component Representation
<xs:schema targetNamespace="http://www.astrogrid.org/schema/CEAImplementation/v1" elementFormDefault="qualified" attributeFormDefault="unqualified" version="0.2">
<xs:import namespace="http://www.astrogrid.org/schema/AGParameterDefinition/v1" schemaLocation="AGParameterDefinition.xsd"/>
<xs:import namespace="http://www.astrogrid.org/schema/CommonExecutionArchitectureBase/v1" schemaLocation="AGApplicationBase.xsd"/>
...
</xs:schema>
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Global Declarations

Element: Application

Name Application
Type Locally-defined complex type
Nillable no
Abstract no
Documentation The definition of what an application is
XML Instance Representation
<ceaimp:Application
name=" xs:string [1] ?"
instanceClass=" xs:string [0..1] ?"
version=" xs:string [0..1] ?">
<!--
Uniqueness Constraint - parameternameunique
Selector - ./ceab:Parameters/ceaimp:CmdLineParameterDefn
Field(s) - @name
-->
<!--
Uniqueness Constraint - interfacenameunique
Selector - ./ceab:Interfaces/ceab:Interface
Field(s) - @name
-->
<!--
Key Reference Constraint - parametername
Selector - .//ceab:pref
Field(s) - @ref
Refers to - ceaimp:parameternameunique
-->

<agab:ApplicationType> agab:ApplicationKindType </agab:ApplicationType> [0..1] ?
<agab:Parameters> [1] ?
<agab:Parameter> ... </agab:Parameter> [0..*]
</agab:Parameters>
<agab:Interfaces> agab:InterfacesType </agab:Interfaces> [1] ?
<ceaimp:ExecutionPath> xs:string </ceaimp:ExecutionPath> [1] ?
<ceaimp:LongName> xs:string </ceaimp:LongName> [1]
<ceaimp:Version> xs:string </ceaimp:Version> [0..1] ?
<ceaimp:Description> xs:string </ceaimp:Description> [0..1] ?
<ceaimp:ReferenceURL> xs:anyURI </ceaimp:ReferenceURL> [0..*] ?
</ceaimp:Application>
Schema Component Representation
<xs:element name="Application">
<xs:complexType>
<xs:complexContent>
<xs:extension base=" ceaimp:CommandLineApplication ">
<xs:attribute name="version" type=" xs:string " use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:unique name="parameternameunique">
<xs:selector xpath="./ceab:Parameters/ceaimp:CmdLineParameterDefn"/>
<xs:field xpath="@name"/>
</xs:unique>
<xs:unique name="interfacenameunique">
<xs:selector xpath="./ceab:Interfaces/ceab:Interface"/>
<xs:field xpath="@name"/>
</xs:unique>
<xs:keyref name="parametername" refer=" ceaimp:parameternameunique ">
<xs:selector xpath=".//ceab:pref"/>
<xs:field xpath="@ref"/>
</xs:keyref>
</xs:element>
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Element: CmdLineParameterDefn

  • This element can be used wherever the following element is referenced:
Name CmdLineParameterDefn
Type Locally-defined complex type
Nillable no
Abstract no
Documentation The specialization for a command line parameter
XML Instance Representation
<ceaimp:CmdLineParameterDefn
name=" xs:string [1]"
type=" agpd:parameterTypes [1]"
accept-encodings=" xs:string [0..1]"
sub-type=" xs:string [0..1]"
commandSwitch=" xs:string [0..1] ?"
commandPosition=" xs:int [0..1] ?"
stdio=" xs:boolean [0..1] ?"
switchType=" ceaimp:switchTypes [0..1] ?"
fileRef=" xs:boolean [0..1] ?"
localFileName=" xs:string [0..1] ?">
Start All [1]
<agpd:UI_Name> xs:string </agpd:UI_Name> [0..1] ?
<agpd:UI_Description> agpd:xhtmlDocumentation </agpd:UI_Description> [0..1] ?
<agpd:UCD> xs:string </agpd:UCD> [0..1] ?
<agpd:DefaultValue> xs:string </agpd:DefaultValue> [0..1] ?
<agpd:Units> xs:string </agpd:Units> [0..1] ?
<agpd:OptionList> [0..1] ?
<agpd:OptionVal> xs:string </agpd:OptionVal> [1..*]
</agpd:OptionList>
End All
</ceaimp:CmdLineParameterDefn>
Schema Component Representation
<xs:element name="CmdLineParameterDefn" substitutionGroup="ceab:Parameter">
<xs:complexType>
<xs:complexContent>
<xs:extension base=" ceaimp:CommandLineParameterDefinition "/>
</xs:complexContent>
</xs:complexType>
</xs:element>
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Element: CommandLineExecutionControllerConfig

Name CommandLineExecutionControllerConfig
Type Locally-defined complex type
Nillable no
Abstract no
Documentation The configuration for a command line execution controller
XML Instance Representation
<ceaimp:CommandLineExecutionControllerConfig>
<ceaimp:Application> ... </ceaimp:Application> [1..*]
</ceaimp:CommandLineExecutionControllerConfig>
Schema Component Representation
<xs:element name="CommandLineExecutionControllerConfig">
<xs:complexType>
<xs:complexContent>
<xs:extension base=" ceaimp:CommonExecutionConnectorConfigType ">
<xs:sequence>
<xs:element ref=" ceaimp:Application " maxOccurs="unbounded"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
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Element: DataCentre

Name DataCentre
Type ceaimp:DataCentreApplication
Nillable no
Abstract no
XML Instance Representation
<ceaimp:DataCentre
name=" xs:string [1] ?"
instanceClass=" xs:string [0..1] ?">
<!--
Uniqueness Constraint - DCparameternameunique
Selector - ./ceab:Parameters/ceaimp:DataCentreParameterDefn
Field(s) - @name
-->
<!--
Uniqueness Constraint - DCinterfacenameunique
Selector - ./ceab:Interfaces/ceab:Interface
Field(s) - @name
-->
<!--
Key Reference Constraint - DCparametername
Selector - .//ceab:pref
Field(s) - @ref
Refers to - ceaimp:DCparameternameunique
-->

<agab:ApplicationType> agab:ApplicationKindType </agab:ApplicationType> [0..1] ?
<agab:Parameters> [1] ?
<agab:Parameter> ... </agab:Parameter> [0..*]
</agab:Parameters>
<agab:Interfaces> agab:InterfacesType </agab:Interfaces> [1] ?
</ceaimp:DataCentre>
Schema Component Representation
<xs:element name="DataCentre" type=" ceaimp:DataCentreApplication ">
<xs:unique name="DCparameternameunique">
<xs:selector xpath="./ceab:Parameters/ceaimp:DataCentreParameterDefn"/>
<xs:field xpath="@name"/>
</xs:unique>
<xs:unique name="DCinterfacenameunique">
<xs:selector xpath="./ceab:Interfaces/ceab:Interface"/>
<xs:field xpath="@name"/>
</xs:unique>
<xs:keyref name="DCparametername" refer=" ceaimp:DCparameternameunique ">
<xs:selector xpath=".//ceab:pref"/>
<xs:field xpath="@ref"/>
</xs:keyref>
</xs:element>
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Element: DataCentreControllerConfig

Name DataCentreControllerConfig
Type Locally-defined complex type
Nillable no
Abstract no
Documentation Configuration for a set of datacentre descriptions
XML Instance Representation
<ceaimp:DataCentreControllerConfig>
<ceaimp:DataCentre> ... </ceaimp:DataCentre> [1..*]
</ceaimp:DataCentreControllerConfig>
Schema Component Representation
<xs:element name="DataCentreControllerConfig">
<xs:complexType>
<xs:complexContent>
<xs:extension base=" ceaimp:CommonExecutionConnectorConfigType ">
<xs:sequence>
<xs:element ref=" ceaimp:DataCentre " maxOccurs="unbounded"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
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Element: DataCentreParameterDefn

  • This element can be used wherever the following element is referenced:
Name DataCentreParameterDefn
Type ceaimp:DataCenterParameterDefinition
Nillable no
Abstract no
Documentation The specialization for a datacentre parameter
XML Instance Representation
<ceaimp:DataCentreParameterDefn
name=" xs:string [1]"
type=" agpd:parameterTypes [1]"
accept-encodings=" xs:string [0..1]"
sub-type=" xs:string [0..1]">
Start All [1]
<agpd:UI_Name> xs:string </agpd:UI_Name> [0..1] ?
<agpd:UI_Description> agpd:xhtmlDocumentation </agpd:UI_Description> [0..1] ?
<agpd:UCD> xs:string </agpd:UCD> [0..1] ?
<agpd:DefaultValue> xs:string </agpd:DefaultValue> [0..1] ?
<agpd:Units> xs:string </agpd:Units> [0..1] ?
<agpd:OptionList> [0..1] ?
<agpd:OptionVal> xs:string </agpd:OptionVal> [1..*]
</agpd:OptionList>
End All
</ceaimp:DataCentreParameterDefn>
Schema Component Representation
<xs:element name="DataCentreParameterDefn" type=" ceaimp:DataCenterParameterDefinition " substitutionGroup="ceab:Parameter"/>
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Element: WebService

Name WebService
Type ceaimp:WebServiceApplication
Nillable no
Abstract no
XML Instance Representation
<ceaimp:WebService
name=" xs:string [1] ?"
instanceClass=" xs:string [0..1] ?">
<!--
Uniqueness Constraint - WSparameternameunique
Selector - ./ceab:Parameters/ceaimp:WebServiceParameterDefn
Field(s) - @name
-->
<!--
Uniqueness Constraint - WSinterfacenameunique
Selector - ./ceab:Interfaces/ceab:Interface
Field(s) - @name
-->
<!--
Key Reference Constraint - WSparametername
Selector - .//ceab:pref
Field(s) - @ref
Refers to - ceaimp:WSparameternameunique
-->

<agab:ApplicationType> agab:ApplicationKindType </agab:ApplicationType> [0..1] ?
<agab:Parameters> [1] ?
<agab:Parameter> ... </agab:Parameter> [0..*]
</agab:Parameters>
<agab:Interfaces> agab:InterfacesType </agab:Interfaces> [1] ?
</ceaimp:WebService>
Schema Component Representation
<xs:element name="WebService" type=" ceaimp:WebServiceApplication ">
<xs:unique name="WSparameternameunique">
<xs:selector xpath="./ceab:Parameters/ceaimp:WebServiceParameterDefn"/>
<xs:field xpath="@name"/>
</xs:unique>
<xs:unique name="WSinterfacenameunique">
<xs:selector xpath="./ceab:Interfaces/ceab:Interface"/>
<xs:field xpath="@name"/>
</xs:unique>
<xs:keyref name="WSparametername" refer=" ceaimp:WSparameternameunique ">
<xs:selector xpath=".//ceab:pref"/>
<xs:field xpath="@ref"/>
</xs:keyref>
</xs:element>
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Element: WebServiceExecutionControllerConfig

Name WebServiceExecutionControllerConfig
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<ceaimp:WebServiceExecutionControllerConfig>
<ceaimp:WebService> ... </ceaimp:WebService> [1..*]
</ceaimp:WebServiceExecutionControllerConfig>
Schema Component Representation
<xs:element name="WebServiceExecutionControllerConfig">
<xs:complexType>
<xs:complexContent>
<xs:extension base=" ceaimp:CommonExecutionConnectorConfigType ">
<xs:sequence>
<xs:element ref=" ceaimp:WebService " maxOccurs="unbounded"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
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Element: WebServiceParameterDefn

  • This element can be used wherever the following element is referenced:
Name WebServiceParameterDefn
Type ceaimp:WebServiceParameterDefinition
Nillable no
Abstract no
Documentation The specialization for a web service parameter
XML Instance Representation
<ceaimp:WebServiceParameterDefn
name=" xs:string [1]"
type=" agpd:parameterTypes [1]"
accept-encodings=" xs:string [0..1]"
sub-type=" xs:string [0..1]">
Start All [1]
<agpd:UI_Name> xs:string </agpd:UI_Name> [0..1] ?
<agpd:UI_Description> agpd:xhtmlDocumentation </agpd:UI_Description> [0..1] ?
<agpd:UCD> xs:string </agpd:UCD> [0..1] ?
<agpd:DefaultValue> xs:string </agpd:DefaultValue> [0..1] ?
<agpd:Units> xs:string </agpd:Units> [0..1] ?
<agpd:OptionList> [0..1] ?
<agpd:OptionVal> xs:string </agpd:OptionVal> [1..*]
</agpd:OptionList>
End All
</ceaimp:WebServiceParameterDefn>
Schema Component Representation
<xs:element name="WebServiceParameterDefn" type=" ceaimp:WebServiceParameterDefinition " substitutionGroup="ceab:Parameter"/>
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Global Definitions

Complex Type: CommandLineApplication

Super-types: ceab:ApplicationBase < CommandLineApplication (by extension)
Sub-types: None
Name CommandLineApplication
Abstract no
Documentation Description of a command line application
XML Instance Representation
<...
name=" xs:string [1] ?"
instanceClass=" xs:string [0..1] ?">
<agab:ApplicationType> agab:ApplicationKindType </agab:ApplicationType> [0..1] ?
<agab:Parameters> [1] ?
<agab:Parameter> ... </agab:Parameter> [0..*]
</agab:Parameters>
<agab:Interfaces> agab:InterfacesType </agab:Interfaces> [1] ?
<ceaimp:ExecutionPath> xs:string </ceaimp:ExecutionPath> [1] ?
<ceaimp:LongName> xs:string </ceaimp:LongName> [1]
<ceaimp:Version> xs:string </ceaimp:Version> [0..1] ?
<ceaimp:Description> xs:string </ceaimp:Description> [0..1] ?
<ceaimp:ReferenceURL> xs:anyURI </ceaimp:ReferenceURL> [0..*] ?
</...>
Schema Component Representation
<xs:complexType name="CommandLineApplication">
<xs:complexContent>
<xs:extension base=" ceab:ApplicationBase ">
<xs:sequence>
<xs:element name="ExecutionPath" type=" xs:string "/>
<xs:element name="LongName" type=" xs:string " minOccurs="1"/>
<xs:element name="Version" type=" xs:string " minOccurs="0"/>
<xs:element name="Description" type=" xs:string " minOccurs="0"/>
<xs:element name="ReferenceURL" type=" xs:anyURI " minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
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Complex Type: CommandLineParameterDefinition

Super-types: ceapd:BaseParameterDefinition < CommandLineParameterDefinition (by extension)
Sub-types: None
Name CommandLineParameterDefinition
Abstract no
Documentation Defines what it is to be a command line parameter - needs more thought with experience
XML Instance Representation
<...
name=" xs:string [1]"
type=" agpd:parameterTypes [1]"
accept-encodings=" xs:string [0..1]"
sub-type=" xs:string [0..1]"
commandSwitch=" xs:string [0..1] ?"
commandPosition=" xs:int [0..1] ?"
stdio=" xs:boolean [0..1] ?"
switchType=" ceaimp:switchTypes [0..1] ?"
fileRef=" xs:boolean [0..1] ?"
localFileName=" xs:string [0..1] ?">
Start All [1]
<agpd:UI_Name> xs:string </agpd:UI_Name> [0..1] ?
<agpd:UI_Description> agpd:xhtmlDocumentation </agpd:UI_Description> [0..1] ?
<agpd:UCD> xs:string </agpd:UCD> [0..1] ?
<agpd:DefaultValue> xs:string </agpd:DefaultValue> [0..1] ?
<agpd:Units> xs:string </agpd:Units> [0..1] ?
<agpd:OptionList> [0..1] ?
<agpd:OptionVal> xs:string </agpd:OptionVal> [1..*]
</agpd:OptionList>
End All
</...>
Schema Component Representation
<xs:complexType name="CommandLineParameterDefinition">
<xs:complexContent>
<xs:extension base=" ceapd:BaseParameterDefinition ">
<xs:attribute name="commandSwitch" type=" xs:string " use="optional"/>
<xs:attribute name="commandPosition" type=" xs:int " use="optional" default="-1"/>
<xs:attribute name="stdio" type=" xs:boolean " use="optional" default="false"/>
<xs:attribute name="switchType" type=" ceaimp:switchTypes " use="optional" default="normal"/>
<xs:attribute name="fileRef" type=" xs:boolean " use="optional" default="true"/>
<xs:attribute name="localFileName" type=" xs:string " use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
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Complex Type: CommonExecutionConnectorConfigType

Super-types: None
Sub-types: None
Name CommonExecutionConnectorConfigType
Abstract no
Documentation The base for a common execution connector configuration
XML Instance Representation
<.../>
Schema Component Representation
<xs:complexType name="CommonExecutionConnectorConfigType"/>
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Complex Type: DataCenterParameterDefinition

Super-types: ceapd:BaseParameterDefinition < DataCenterParameterDefinition (by extension)
Sub-types: None
Name DataCenterParameterDefinition
Abstract no
Documentation special properties for datacentre parameters
XML Instance Representation
<...
name=" xs:string [1]"
type=" agpd:parameterTypes [1]"
accept-encodings=" xs:string [0..1]"
sub-type=" xs:string [0..1]">
Start All [1]
<agpd:UI_Name> xs:string </agpd:UI_Name> [0..1] ?
<agpd:UI_Description> agpd:xhtmlDocumentation </agpd:UI_Description> [0..1] ?
<agpd:UCD> xs:string </agpd:UCD> [0..1] ?
<agpd:DefaultValue> xs:string </agpd:DefaultValue> [0..1] ?
<agpd:Units> xs:string </agpd:Units> [0..1] ?
<agpd:OptionList> [0..1] ?
<agpd:OptionVal> xs:string </agpd:OptionVal> [1..*]
</agpd:OptionList>
End All
</...>
Schema Component Representation
<xs:complexType name="DataCenterParameterDefinition">
<xs:complexContent>
<xs:extension base=" ceapd:BaseParameterDefinition "/>
</xs:complexContent>
</xs:complexType>
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Complex Type: DataCentreApplication

Super-types: ceab:ApplicationBase < DataCentreApplication (by extension)
Sub-types: None
Name DataCentreApplication
Abstract no
Documentation Description of a data centre application
XML Instance Representation
<...
name=" xs:string [1] ?"
instanceClass=" xs:string [0..1] ?">
<agab:ApplicationType> agab:ApplicationKindType </agab:ApplicationType> [0..1] ?
<agab:Parameters> [1] ?
<agab:Parameter> ... </agab:Parameter> [0..*]
</agab:Parameters>
<agab:Interfaces> agab:InterfacesType </agab:Interfaces> [1] ?
</...>
Schema Component Representation
<xs:complexType name="DataCentreApplication">
<xs:complexContent>
<xs:extension base=" ceab:ApplicationBase "/>
</xs:complexContent>
</xs:complexType>
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Complex Type: WebServiceApplication

Super-types: ceab:ApplicationBase < WebServiceApplication (by extension)
Sub-types: None
Name WebServiceApplication
Abstract no
Documentation Description of a web service application
XML Instance Representation
<...
name=" xs:string [1] ?"
instanceClass=" xs:string [0..1] ?">
<agab:ApplicationType> agab:ApplicationKindType </agab:ApplicationType> [0..1] ?
<agab:Parameters> [1] ?
<agab:Parameter> ... </agab:Parameter> [0..*]
</agab:Parameters>
<agab:Interfaces> agab:InterfacesType </agab:Interfaces> [1] ?
</...>
Schema Component Representation
<xs:complexType name="WebServiceApplication">
<xs:complexContent>
<xs:extension base=" ceab:ApplicationBase "/>
</xs:complexContent>
</xs:complexType>
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Complex Type: WebServiceParameterDefinition

Super-types: ceapd:BaseParameterDefinition < WebServiceParameterDefinition (by extension)
Sub-types: None
Name WebServiceParameterDefinition
Abstract no
Documentation Special properties for web serivce parameters
XML Instance Representation
<...
name=" xs:string [1]"
type=" agpd:parameterTypes [1]"
accept-encodings=" xs:string [0..1]"
sub-type=" xs:string [0..1]">
Start All [1]
<agpd:UI_Name> xs:string </agpd:UI_Name> [0..1] ?
<agpd:UI_Description> agpd:xhtmlDocumentation </agpd:UI_Description> [0..1] ?
<agpd:UCD> xs:string </agpd:UCD> [0..1] ?
<agpd:DefaultValue> xs:string </agpd:DefaultValue> [0..1] ?
<agpd:Units> xs:string </agpd:Units> [0..1] ?
<agpd:OptionList> [0..1] ?
<agpd:OptionVal> xs:string </agpd:OptionVal> [1..*]
</agpd:OptionList>
End All
</...>
Schema Component Representation
<xs:complexType name="WebServiceParameterDefinition">
<xs:complexContent>
<xs:extension base=" ceapd:BaseParameterDefinition "/>
</xs:complexContent>
</xs:complexType>
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Simple Type: switchTypes

Super-types: xs:string < switchTypes (by restriction)
Sub-types: None
Name switchTypes
Content
  • Base XSD Type: string
  • value comes from list: {'normal'|'keyword'}
Documentation normal is the -x value style and keyword is the x=value style
Schema Component Representation
<xs:simpleType name="switchTypes">
<xs:restriction base=" xs:string ">
<xs:enumeration value="normal"/>
<xs:enumeration value="keyword"/>
</xs:restriction>
</xs:simpleType>
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Legend

Complex Type:

Schema Component Type

AusAddress

Schema Component Name
Super-types: Address < AusAddress (by extension)
Sub-types:
  • QLDAddress (by restriction)
If this schema component is a type definition, its type hierarchy is shown in a gray-bordered box.
Name AusAddress
Abstract no
The table above displays the properties of this schema component.
XML Instance Representation
<... country="Australia" >
<unitNo> string </unitNo> [0..1]
<houseNo> string </houseNo> [1]
<street> string </street> [1]
Start Choice [1]
<city> string </city> [1]
<town> string </town> [1]
End Choice
<state> AusStates </state> [1]
<postcode> string <<pattern = [1-9][0-9]{3}>> </postcode> [1] ?
</...>

The XML Instance Representation table above shows the schema component's content as an XML instance.

Schema Component Representation
<complexType name="AusAddress">
<complexContent>
<extension base=" Address ">
<sequence>
<element name="state" type=" AusStates "/>
<element name="postcode">
<simpleType>
<restriction base=" string ">
<pattern value="[1-9][0-9]{3}"/>
</restriction>
</simpleType>
</element>
</sequence>
<attribute name="country" type=" string " fixed="Australia"/>
</extension>
</complexContent>
</complexType>
The Schema Component Representation table above displays the underlying XML representation of the schema component. (Annotations are not shown.)
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Glossary

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.

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