XSD Make minOccurs depend on containing type -

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I have a complex type defined that currently does not have any minOccurs restriction when I type an element of this complex type I sometimes use elements minOccurs 0, other times 1. for example. 

  & lt; Xsd: complex type name = "identifier" & gt; & Lt; XSD: Sequence & gt; & Lt; Xsd: element name = "id" type = "xsd: string" /> & Lt; Xsd: element name = "version" type = "xsd: string" /> & Lt; / XSD: Sequence & gt; & Lt; / XSD: complexType & gt; & Lt; Xsd: complex type name = "wrabs" & gt; & Lt; XSD: Sequence & gt; & Lt; Xsd: element name = "id" type = "identifier" /> & Lt ;! - I 'Wibble' - & gt; I want to be mandatory for all the identifiers used as part of & Lt; / XSD: Sequence & gt; & Lt; / XSD: complexType & gt; & Lt; Xsd: complex type name = "wobble" & gt; & Lt; XSD: Sequence & gt; & Lt; Xsd: element name = "id" type = "identifier" /> & Lt ;! - I 'wobble' - & gt; All elements of the identifier should be optional when used as part of. & Lt; / XSD: Sequence & gt; & Lt; / XSD: complexType & gt;

Is this possible?

Thanks in advance.

Groups are your friends, like 

   & Lt; / XSD: Sequence & gt; & Lt; / XSD: Groups & gt; & Lt; Xsd: complex type name = "wrabs" & gt; & Lt; XSD: Sequence & gt; & Lt; Xsd: group ref = "identifier group" minOccurs = "1" /> & Lt ;! - More elements for Wibble here - & gt; & Lt; / XSD: Sequence & gt; & Lt; / XSD: complexType & gt; & Lt; Xsd: complex type name = "wobble" & gt; & Lt; XSD: Sequence & gt; & Lt; Xsd: group ref = "identifier group" minOccurs = "0" /> & Lt ;! - More element for the wobble here - & gt; & Lt; / XSD: Sequence & gt; & Lt; / XSD: complexType & gt;

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