Declarations : group « XML Schema « XML Tutorial

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3. group

<group name="name of global group"> 

All global <group> declarations must be named. 
The basic structure of a global <group> declaration follows: 

<group name="NCName"
    ref="NCName"
    maxOccurs="nonNegativeInteger | unbounded"
    minOccurs="nonNegativeInteger"
    id="ID">
  Content: (annotation?, (all | choice | sequence))
</group>