XML Schema for WSML identifiers

Table of Contents


Schema Document Properties

Target Namespace http://www.wsmo.org/wsml/wsml-syntax#
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.
Documentation version: $Revision: 1.13 $ date: $Date: 2005/03/04 11:50:15 $ author: Jos de Bruijn this schema is a module, which belongs to the WSML/XML schema specification. This schema provides the necessary definitions for the identifiers in WSML/XML.

Declared Namespaces

Prefix Namespace
Default namespace http://www.wsmo.org/wsml/wsml-syntax#
xml http://www.w3.org/XML/1998/namespace
xs http://www.w3.org/2001/XMLSchema
Schema Component Representation
<xs:schema targetNamespace="http://www.wsmo.org/wsml/wsml-syntax#" elementFormDefault="qualified" attributeFormDefault="unqualified">

Global Schema Components

Simple Type: wsmlIRI

Super-types: None
Sub-types: None
Name wsmlIRI
  • Union of following types:
    • xs:string
Documentation The basic kind of identifier in WSML: an IRI. As an URI is more restrictive then an IRI, we are forced to use xs:string instead of xs:anyURI as type! Note that when translating the standard WSML syntax to XML, Qualified names are resolved to full IRIs. When using the reserved IRI http://www.wsmo.org/2004/wsml#anonymousID, it is interpreted as an anonymous ID.
Schema Component Representation
<xs:simpleType name="wsmlIRI">
<xs:union memberTypes=" xs:string"/>

Complex Type: wsmlAnyValue

Super-types: None
Sub-types: None
Name wsmlAnyValue
Abstract no
Documentation A data value in WSML. The type is required. Because we allow complex constructed data values, a data value can have multiple arguments. The arguments are strictly ordered. The content is mixed; it is thus possible to use both regular text and tags which represent the arguments. Regular text is interpreted as the first argument.
XML Instance Representation
type=" wsmlIRI [1]">
<!-- Mixed content -->
<argument> xs:string </argument> [0..*]
Schema Component Representation
<xs:complexType name="wsmlAnyValue" mixed="true">
<xs:element name="argument" type=" xs:string " minOccurs="0" maxOccurs="unbounded"/>
<xs:attribute name="type" type=" wsmlIRI " use="required"/>

Complex Type: wsmlID

Super-types: xs:string < wsmlID (by extension)
Sub-types: None
Name wsmlID
Abstract no
Documentation wsmlID corresponds with either an IRI, a string, an integer, a decimal, a variable or an anonymous identifier. The type of the identifier is indicated in the attribute 'type'. The IRIs identifying the types IRI, string, integer and decimal correspond with the IRIs of the datatypes as defined in Appendix C of the WSML specification. The type variable is identified with the IRI http://www.wsmo.org/2004/wsml#variable, the type anonymousID is identified with http://www.wsmo.org/2004/wsml#anonymousID.
XML Instance Representation
type=" wsmlIRI [1]">
Schema Component Representation
<xs:complexType name="wsmlID">
<xs:extension base=" xs:string ">
<xs:attribute name="type" type=" wsmlIRI " use="required"/>

Simple Type: wsmlVariable

Super-types: xs:string < wsmlVariable (by restriction)
Sub-types: None
Name wsmlVariable
  • Base XSD Type: string
  • pattern = '?'([a-z][A-Z][0-9][0x4E00 - 0x9FA5][0x3007][0x3021 - 0x3029])+
Documentation A variables in a WSML logical expression.
Schema Component Representation
<xs:simpleType name="wsmlVariable">
<xs:restriction base=" xs:string ">
<xs:pattern value="'?'([a-z][A-Z][0-9][0x4E00 - 0x9FA5][0x3007][0x3021 - 0x3029])+"/>


Complex Type:

Schema Component Type


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


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.