element <extends>
Namespace:
Type:
Content:
complex, 1 element
Defined:
locally within Type complexType in vo-dml-v1.0.xsd; see XML source
XML Representation Summary
<extends>
   
Content: 
vodml-ref
</extends>
Content model elements (1):
Included in content model of elements (4):
Definition Locations
Annotation
Reference to a type (called the base-type) that is extended by the current type (called the subtype). This implements the typical is-a inheritance relationship, similar to the extends relations in XSD and Java, the generaliation in UML, or the subclassOf relation in RDF. Note, VO-DML does not support multiple inheritance. Instances of a subtype are automatic instances of a base type. Polymorphism is assumed: When a role (see below) defines a base type as its datatype, instances of any subtype can be uased as value of the role. Roles defined on a base type are inherited by the subtypes. Relations inherited from a basetype can be 'subsetted', which is similar to overriding their definition. See the definiton of this property on the Relation type.
XML Source (see within schema source)
<xsd:element minOccurs="0" name="extends" type="ElementRef">
<xsd:annotation>
<xsd:documentation>
Reference to a type (called the base-type) that is extended by the current type (called the subtype).
This implements the typical is-a inheritance relationship, similar to the extends relations in XSD and Java,
the
generaliation in UML, or the subclassOf relation in RDF. Note, VO-DML does not support multiple inheritance.
Instances of a subtype are automatic instances of a base type.
Polymorphism is assumed: When a role (see below) defines a base type
as its datatype, instances of any subtype
can be uased as value of the role.
Roles defined on a base type are inherited by the subtypes.
Relations inherited from a basetype can be 'subsetted', which is similar to overriding their definition.
See the definiton of this property on the Relation type.
</xsd:documentation>
</xsd:annotation>
</xsd:element>
Content Element Detail (all declarations; 1)
vodml-ref
Type:
VODMLREF, simple content
Defined:
locally within ElementRef complexType
The element identifying the referenced target element. See the documentation for the VODMLREF type.
XML Source (see within schema source)
<xsd:element name="vodml-ref" type="VODMLREF">
<xsd:annotation>
<xsd:documentation>
The element identifying the referenced target element.
See the documentation for the VODMLREF type.
</xsd:documentation>
</xsd:annotation>
</xsd:element>

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