Question

<Performance>
  <grouping usingTarget="M/R" />
  <state code="test"/>
  <state code="test2"/>
</Performance>

How do I write XML schema for the following so that only a single (required) grouping tag can be specified, however, unlimited (or zero) state tags can be specified?

Currently I have this which is allowing additional grouping tags.

  <xsi:complexType name="PerformanceType">
    <xsi:choice minOccurs="1" maxOccurs="unbounded">
      <xsi:element ref="grouping" minOccurs="1" maxOccurs="1"  />
      <xsi:element ref="client"  />
    </xsi:choice>
  </xsi:complexType>

Answer 1

<xs:complexType name="PerformanceType">
    <xs:sequence>
      <xs:element ref="grouping" minOccurs="1" maxOccurs="1"  />
      <xs:element ref="state" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
</xs:complexType>