XML Schema

Name

xs:group(reference) — Reference to a global elements group declaration or local definition (local definitions cannot be referenced).

Synopsis

<xs:group
           id          = xs:ID
           maxOccurs          = ( xs:nonNegativeInteger | “unbounded” ) : “1”
           minOccurs          = xs:nonNegativeInteger : “1”
           ref          = xs:QName
           {any attributes with non-schema namespace}
           >
           Content: (xs:annotation?)
</xs:group>

May be included in: xs:choice (outside a group), xs:choice (within a group), xs:complexType (local definition), xs:complexType (global definition), xs:extension (complex content), xs:restriction (complex content), xs:sequence (within a group), xs:sequence (outside a group)

Description

Used in a local context, xs:group is a reference to an element group. The effect is a logical replacement of the group reference by the group’s content.

When a group is being redefined (through xs:redefine), a self reference (i.e., a reference to the group being redefined) specifically means “include the original content of the group at this location.”

Restrictions

Groups cannot be recursive (i.e., a group cannot be referred to either directly or indirectly within its definition).

Example

<xs:element name="author">
  <xs:complexType>
    <xs:sequence>
      <xs:group ref="name"/>
      <xs:element ref="born"/>
      <xs:element ref="dead" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute ref="id"/>
  </xs:complexType>
</xs:element>

Attributes

id

W3C XML Schema’s element ID.

maxOccurs

Maximum number of occurrences of the group.

minOccurs

Minimum number of occurrences of the group. ...