XML Schema Documentation

Table of Contents

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Schema Document Properties

Target Namespace http://www.o-xml.org/namespace/mlml/
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.

Declared Namespaces

Prefix Namespace
Default namespace http://www.w3.org/2001/XMLSchema
xml http://www.w3.org/XML/1998/namespace
mlml http://www.o-xml.org/namespace/mlml/
Schema Component Representation
<schema targetNamespace="http://www.o-xml.org/namespace/mlml/" elementFormDefault="qualified" attributeFormDefault="unqualified">
...
</schema>
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Global Declarations

Element: body

Name body
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:body
lang="mlml:Name [0..1]">
Start Group: mlml:instruction [0..*]
Start Choice [1]
<mlml:instruction> ... </mlml:instruction> [1]
Start Choice [1]
<mlml:call> ... </mlml:call> [1]
<mlml:reference> ... </mlml:reference> [1]
<mlml:literal> ... </mlml:literal> [1]
<mlml:operation> ... </mlml:operation> [1]
<mlml:return> ... </mlml:return> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
End Group: mlml:instruction
</mlml:body>
Schema Component Representation
<element name="body">
<complexType>
<sequence>
<group ref="mlml:instruction" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="lang" type="mlml:Name" use="optional"/>
</complexType>
</element>
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Element: call

Name call
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:call
name="mlml:Name [1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
<mlml:target> mlml:expression </mlml:target> [0..1]
<mlml:param> ... </mlml:param> [0..*]
</mlml:call>
Schema Component Representation
<element name="call">
<complexType>
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<element name="target" type="mlml:expression" minOccurs="0" maxOccurs="1"/>
<element ref="mlml:param" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: function

Name function
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:function
name="mlml:Name [1]"
access="mlml:Access [0..1]">
<mlml:modifier> mlml:modref </mlml:modifier> [0..*]
<mlml:type> mlml:typeref </mlml:type> [0..1]
<mlml:param> ... </mlml:param> [0..*]
<mlml:body> ... </mlml:body> [0..*]
</mlml:function>
Schema Component Representation
<element name="function">
<complexType>
<sequence>
<element name="modifier" type="mlml:modref" minOccurs="0" maxOccurs="unbounded"/>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<element ref="mlml:param" minOccurs="0" maxOccurs="unbounded"/>
<element ref="mlml:body" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
<attribute name="access" type="mlml:Access" use="optional"/>
</complexType>
</element>
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Element: instruction

Name instruction
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:instruction
name="mlml:Name [1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
<mlml:param> ... </mlml:param> [0..*]
</mlml:instruction>
Schema Component Representation
<element name="instruction">
<complexType>
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<element ref="mlml:param" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: language

Name language
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:language
name="mlml:Name [1]">
Start Group: mlml:declaration [0..*]
Start Choice [1]
<mlml:module> ... </mlml:module> [1]
<mlml:type> ... </mlml:type> [1]
<mlml:function> ... </mlml:function> [1]
<mlml:variable> ... </mlml:variable> [1]
<mlml:statement> ... </mlml:statement> [1]
<mlml:operator> ... </mlml:operator> [1]
<mlml:modifier> ... </mlml:modifier> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
End Group: mlml:declaration
</mlml:language>
Schema Component Representation
<element name="language">
<complexType>
<sequence>
<group ref="mlml:declaration" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: literal

Name literal
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:literal>
<mlml:modifier> mlml:modref </mlml:modifier> [0..*]
<mlml:type> mlml:typeref </mlml:type> [0..1]
<mlml:value> string </mlml:value> [1]
</mlml:literal>
Schema Component Representation
<element name="literal">
<complexType>
<sequence>
<element name="modifier" type="mlml:modref" minOccurs="0" maxOccurs="unbounded"/>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<element name="value" type="string" minOccurs="1" maxOccurs="1"/>
</sequence>
</complexType>
</element>
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Element: modifier

Name modifier
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:modifier
name="mlml:Name [1]"/>
Schema Component Representation
<element name="modifier">
<complexType>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: module

Name module
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:module
name="mlml:Name [1]">
Start Group: mlml:declaration [0..*]
Start Choice [1]
<mlml:module> ... </mlml:module> [1]
<mlml:type> ... </mlml:type> [1]
<mlml:function> ... </mlml:function> [1]
<mlml:variable> ... </mlml:variable> [1]
<mlml:statement> ... </mlml:statement> [1]
<mlml:operator> ... </mlml:operator> [1]
<mlml:modifier> ... </mlml:modifier> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
End Group: mlml:declaration
</mlml:module>
Schema Component Representation
<element name="module">
<complexType>
<sequence>
<group ref="mlml:declaration" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: operation

Name operation
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:operation
name="mlml:Name [1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
<mlml:param> mlml:expression </mlml:param> [0..*]
</mlml:operation>
Schema Component Representation
<element name="operation">
<complexType>
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<element name="param" type="mlml:expression" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: operator

Name operator
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:operator
name="mlml:Name [1]"
access="mlml:Access [0..1]">
<mlml:modifier> mlml:modref </mlml:modifier> [0..*]
<mlml:type> mlml:typeref </mlml:type> [0..1]
<mlml:param> ... </mlml:param> [0..*]
<mlml:body> ... </mlml:body> [0..*]
</mlml:operator>
Schema Component Representation
<element name="operator">
<complexType>
<sequence>
<element name="modifier" type="mlml:modref" minOccurs="0" maxOccurs="unbounded"/>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<element ref="mlml:param" minOccurs="0" maxOccurs="unbounded"/>
<element ref="mlml:body" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
<attribute name="access" type="mlml:Access" use="optional"/>
</complexType>
</element>
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Element: param

Name param
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:param
name="mlml:Name [1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
</mlml:param>
Schema Component Representation
<element name="param">
<complexType>
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: reference

Name reference
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:reference
name="mlml:Name [1]"
refid="IDREF [0..1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
</mlml:reference>
Schema Component Representation
<element name="reference">
<complexType>
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
<attribute name="refid" type="IDREF" use="optional"/>
</complexType>
</element>
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Element: return

Name return
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:return>
<mlml:type> mlml:typeref </mlml:type> [0..1]
Start Group: mlml:instruction [0..1]
Start Choice [1]
<mlml:instruction> ... </mlml:instruction> [1]
Start Choice [1]
<mlml:call> ... </mlml:call> [1]
<mlml:reference> ... </mlml:reference> [1]
<mlml:literal> ... </mlml:literal> [1]
<mlml:operation> ... </mlml:operation> [1]
<mlml:return> ... </mlml:return> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
End Group: mlml:instruction
</mlml:return>
Schema Component Representation
<element name="return">
<complexType>
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<group ref="mlml:instruction" minOccurs="0" maxOccurs="1"/>
</sequence>
</complexType>
</element>
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Element: statement

Name statement
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:statement
name="mlml:Name [1]">
<mlml:param> mlml:expression </mlml:param> [0..*]
<mlml:body> ... </mlml:body> [0..*]
</mlml:statement>
Schema Component Representation
<element name="statement">
<complexType>
<sequence>
<element name="param" type="mlml:expression" minOccurs="0" maxOccurs="unbounded"/>
<element ref="mlml:body" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
</complexType>
</element>
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Element: type

Name type
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:type
name="mlml:Name [1]"
access="mlml:Access [0..1]">
<mlml:modifier> mlml:modref </mlml:modifier> [0..*]
<mlml:param> ... </mlml:param> [0..*]
<mlml:parent> mlml:typeref </mlml:parent> [0..*]
<mlml:variable> ... </mlml:variable> [0..*]
<mlml:function> ... </mlml:function> [0..*]
</mlml:type>
Schema Component Representation
<element name="type">
<complexType>
<sequence>
<element name="modifier" type="mlml:modref" minOccurs="0" maxOccurs="unbounded"/>
<element ref="mlml:param" minOccurs="0" maxOccurs="unbounded"/>
<element name="parent" type="mlml:typeref" minOccurs="0" maxOccurs="unbounded"/>
<element ref="mlml:variable" minOccurs="0" maxOccurs="unbounded"/>
<element ref="mlml:function" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
<attribute name="access" type="mlml:Access" use="optional"/>
</complexType>
</element>
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Element: unit

Name unit
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:unit>
Start Group: mlml:declaration [0..*]
Start Choice [1]
<mlml:module> ... </mlml:module> [1]
<mlml:type> ... </mlml:type> [1]
<mlml:function> ... </mlml:function> [1]
<mlml:variable> ... </mlml:variable> [1]
<mlml:statement> ... </mlml:statement> [1]
<mlml:operator> ... </mlml:operator> [1]
<mlml:modifier> ... </mlml:modifier> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
End Group: mlml:declaration
</mlml:unit>
Schema Component Representation
<element name="unit">
<complexType>
<sequence>
<group ref="mlml:declaration" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
</complexType>
</element>
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Element: variable

Name variable
Type Locally-defined complex type
Nillable no
Abstract no
XML Instance Representation
<mlml:variable
name="mlml:Name [1]"
access="mlml:Access [0..1]"
id="ID [0..1]">
<mlml:modifier> mlml:modref </mlml:modifier> [0..*]
<mlml:type> mlml:typeref </mlml:type> [0..1]
</mlml:variable>
Schema Component Representation
<element name="variable">
<complexType>
<sequence>
<element name="modifier" type="mlml:modref" minOccurs="0" maxOccurs="unbounded"/>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
</sequence>
<attribute name="name" type="mlml:Name" use="required"/>
<attribute name="access" type="mlml:Access" use="optional"/>
<attribute name="id" type="ID" use="optional"/>
</complexType>
</element>
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Global Definitions

Complex Type: expression

Super-types: None
Sub-types: None
Name expression
Abstract no
XML Instance Representation
<...
name="mlml:Name [0..1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
Start Group: mlml:expression [0..*]
Start Choice [1]
<mlml:call> ... </mlml:call> [1]
<mlml:reference> ... </mlml:reference> [1]
<mlml:literal> ... </mlml:literal> [1]
<mlml:operation> ... </mlml:operation> [1]
<mlml:return> ... </mlml:return> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
End Group: mlml:expression
</...>
Schema Component Representation
<complexType name="expression">
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
<group ref="mlml:expression" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
<attribute name="name" type="mlml:Name" use="optional"/>
</complexType>
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Complex Type: modref

Super-types: None
Sub-types: None
Name modref
Abstract no
XML Instance Representation
<...
ref="mlml:Name [1]"/>
Schema Component Representation
<complexType name="modref">
<attribute name="ref" type="mlml:Name" use="required"/>
</complexType>
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Complex Type: typeref

Super-types: None
Sub-types: None
Name typeref
Abstract no
XML Instance Representation
<...
ref="mlml:Name [1]">
<mlml:type> mlml:typeref </mlml:type> [0..1]
</...>
Schema Component Representation
<complexType name="typeref">
<sequence>
<element name="type" type="mlml:typeref" minOccurs="0" maxOccurs="1"/>
</sequence>
<attribute name="ref" type="mlml:Name" use="required"/>
</complexType>
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Model Group: declaration

Name declaration
XML Instance Representation
Start Choice [1]
<mlml:module> ... </mlml:module> [1]
<mlml:type> ... </mlml:type> [1]
<mlml:function> ... </mlml:function> [1]
<mlml:variable> ... </mlml:variable> [1]
<mlml:statement> ... </mlml:statement> [1]
<mlml:operator> ... </mlml:operator> [1]
<mlml:modifier> ... </mlml:modifier> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
Schema Component Representation
<group name="declaration">
<choice>
<element ref="mlml:module"/>
<element ref="mlml:type"/>
<element ref="mlml:function"/>
<element ref="mlml:variable"/>
<element ref="mlml:statement"/>
<element ref="mlml:operator"/>
<element ref="mlml:modifier"/>
<any namespace="##other" processContents="lax"/>
</choice>
</group>
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Model Group: expression

Name expression
XML Instance Representation
Start Choice [1]
<mlml:call> ... </mlml:call> [1]
<mlml:reference> ... </mlml:reference> [1]
<mlml:literal> ... </mlml:literal> [1]
<mlml:operation> ... </mlml:operation> [1]
<mlml:return> ... </mlml:return> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
Schema Component Representation
<group name="expression">
<choice>
<element ref="mlml:call"/>
<element ref="mlml:reference"/>
<element ref="mlml:literal"/>
<element ref="mlml:operation"/>
<-- <element ref="mlml:throw"/> -->
<element ref="mlml:return"/>
<any namespace="##other" processContents="lax"/>
</choice>
</group>
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Model Group: instruction

Name instruction
XML Instance Representation
Start Choice [1]
<mlml:instruction> ... </mlml:instruction> [1]
Start Choice [1]
<mlml:call> ... </mlml:call> [1]
<mlml:reference> ... </mlml:reference> [1]
<mlml:literal> ... </mlml:literal> [1]
<mlml:operation> ... </mlml:operation> [1]
<mlml:return> ... </mlml:return> [1]
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
Allow any elements from a namespace other than this schema's namespace (lax validation). [1]
End Choice
Schema Component Representation
<group name="instruction">
<choice>
<element ref="mlml:instruction"/>
<group ref="mlml:expression"/>
<any namespace="##other" processContents="lax"/>
</choice>
</group>
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Simple Type: Access

Super-types: NMTOKEN < Access (by restriction)
Sub-types: None
Name Access
Content
  • Base XSD Type: NMTOKEN
  • value comes from list: {'public'|'protected'|'private'|'package'|'system'}
Schema Component Representation
<simpleType name="Access">
<restriction base="NMTOKEN">
<enumeration value="public"/>
<enumeration value="protected"/>
<enumeration value="private"/>
<enumeration value="package"/>
<enumeration value="system"/>
</restriction>
</simpleType>
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Simple Type: Name

Super-types: Name < Name (by restriction)
Sub-types:
  • Name (by restriction)
Name Name
Content
  • Base XSD Type: Name
Schema Component Representation
<simpleType name="Name">
<restriction base="Name"/>
</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
<complexTypename="AusAddress">
<complexContent>
<extensionbase="Address">
<sequence>
<elementname="state" type="AusStates"/>
<elementname="postcode">
<simpleType>
<restrictionbase="string">
<patternvalue="[1-9][0-9]{3}"/>
</restriction>
</simpleType>
</element>
</sequence>
<attributename="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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