complexType "Relation"

Namespace:	http://www.ivoa.net/xml/VODML/v1.0
Content:	complex, 1 attribute, 6 elements
Abstract:	(cannot be assigned directly to elements used in instance XML documents)
Defined:	globally in vo-dml-v1.0.xsd; see XML source
Used:	at 2 locations

XML Representation Summary

<...

xs:string

Content:

vodml-id, name, description?, datatype, multiplicity, subsets?

</...>

Content Model Elements (6):

Known Direct Subtypes (2):

All Direct / Indirect Based Elements (2):

Known Usage Locations

In derivations of other global types (2):

Composition (as extension base),

Reference (as extension base)

A relation is a Role where the target datatype is an ObjectType.

Type Definition Detail

Type Derivation Tree

ReferableElement (extension)

Role (extension)

Relation

XML Source (see within schema source)

<xsd:complexType abstract="true" name="Relation">

<xsd:annotation>

<xsd:documentation>

A relation is a Role where the target datatype is an ObjectType.

</xsd:documentation>

</xsd:annotation>

<xsd:complexContent>

<xsd:extension base="Role">

<xsd:sequence/>

</xsd:extension>

</xsd:complexContent>

</xsd:complexType>

Attribute Detail (all declarations; 1)

Type:	xsd:string
Use:	optional
Defined:	locally within ReferableElement complexType

A referencable element may be given an @id attribute to reflect an identifier defined in some source document form which a VO-DML model may have been derived.

XML Source (see within schema source)

<xsd:attribute name="id" type="xsd:string" use="optional">

<xsd:annotation>

<xsd:documentation>

A referencable element may be given an @id attribute to reflect an identifier
defined in some source document form which a VO-DML model may have been derived.

</xsd:documentation>

</xsd:annotation>

</xsd:attribute>

Content Element Detail (all declarations; 6)

Type:	ElementRef, complex content
Defined:	locally within Role complexType

Reference to the type that plays the role represented by this Role.

XML Source (see within schema source)

<xsd:element name="datatype" type="ElementRef">

<xsd:annotation>

<xsd:documentation>

Reference to the type that plays the role represented by this Role.

</xsd:documentation>

</xsd:annotation>

</xsd:element>

Type:	xsd:string, simple content
Defined:	locally within ReferableElement complexType

Human readable description of the model element.

XML Source (see within schema source)

<xsd:element minOccurs="0" name="description" type="xsd:string">

<xsd:annotation>

<xsd:documentation>

Human readable description of the model element.

</xsd:documentation>

</xsd:annotation>

</xsd:element>

Type:	Multiplicity, complex content
Defined:	locally within Role complexType

The multiplicity of the role (also called cardinality) indicates whether it must have a value or may be without value, or possibly how many values are allowed.

XML Source (see within schema source)

<xsd:element name="multiplicity" type="Multiplicity">

<xsd:annotation>

<xsd:documentation>

The multiplicity of the role (also called cardinality) indicates whether it must have a
value or may be without value, or possibly how many values are allowed.

</xsd:documentation>

</xsd:annotation>

</xsd:element>

Type:	VODMLName, simple content
Defined:	locally within ReferableElement complexType

The name of the model element. MUST NOT be an empty string.

XML Source (see within schema source)

<xsd:element minOccurs="1" name="name" type="VODMLName">

<xsd:annotation>

<xsd:documentation>

The name of the model element.
MUST NOT be an empty string.

</xsd:documentation>

</xsd:annotation>

</xsd:element>

Type:	ElementRef, complex content
Defined:	locally within Role complexType

Represents the UML subsetted property. Indicates that a particular relation refines the definition of another relation. ONly a relation inherited form a base class can be subsetted. Typical usage is that the base class has a relation to a class A, and the subclass refines this to indicating that the relation should be to a subclass of A. The value should identify the subsetted property. TBD IF we are going to use utype-s to refer to elements also inside this document, we should use an appropriate keyref

TBD this is a somewhat abstract, but very useful modeling concept. It implements a very common modeling design pattern. It exists in UML2.

XML Source (see within schema source)

<xsd:element minOccurs="0" name="subsets" type="ElementRef">

<xsd:annotation>

<xsd:documentation>

Represents the UML subsetted property. Indicates that a particular relation refines the definition
of another relation. ONly a relation inherited form a base class can
be subsetted. Typical usage is
that the base class has a
relation to a class A, and the subclass refines this to indicating that
the relation should be to a subclass of A.

The value should identify the subsetted property.
TBD IF we are going to use utype-s to refer to elements also inside this
document, we should use an
appropriate keyref

</xsd:documentation>

<xsd:documentation>

TBD this is a somewhat abstract, but very useful modeling concept.
It implements a very common modeling design pattern.
It exists in UML2.

</xsd:documentation>

</xsd:annotation>

</xsd:element>

Type:	VODMLID, simple content
Defined:	locally within ReferableElement complexType

Identifier for its containing element. Extracted as a separate type so that we can easily adapt to a different identifier design.

XML Source (see within schema source)

<xsd:element minOccurs="1" name="vodml-id" type="VODMLID">

<xsd:annotation>

<xsd:documentation>

Identifier for its containing element.
Extracted as a separate type so that we can easily adapt to a different identifier design.

</xsd:documentation>

</xsd:annotation>

</xsd:element>

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