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: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>

This XML schema documentation has been generated with DocFlex/XML RE 1.8.0 using DocFlex/XML XSDDoc 2.2.0 template set.

DocFlex/XML RE is a reduced edition of DocFlex/XML, which is a tool for programming and running highly sophisticated documentation and reports generators by the data obtained from any kind of XML files. The actual doc-generators are implemented in the form of special templates that are designed visually using a high quality Template Designer GUI basing on the XML schema (or DTD) files describing the data source XML.

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To use certain features disabled in the free mode (such as the full documenting of substitution groups).
To enable/disable documenting of the initial, imported, included and redefined XML schemas selectively.
To document local element components both globally and locally (similar to attributes).
To enable/disable reproducing of namespace prefixes.
To format your annotations with XHTML tags and reproduce that formatting both in HTML and RTF output.
To insert images in your annotations using XHTML <img> tags (supported both in HTML and RTF output).
To use PlainDoc.tpl main template to generate all the XML schema documentation in the form of a single HTML file.
To use the same template to generate the incredible quality RTF documentation.
To document only selected XML schema components specified by name.
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Namespace:	{global namespace}
Type:	ElementRef
Content:	complex, 1 element
Defined:	locally within Type complexType in vo-dml-v1.0.xsd; see XML source

Type:	VODMLREF, simple content
Defined:	locally within ElementRef complexType