XSD choice inside sequence

user_1106003 0
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I understand and use xs:choice and xs:sequence separately but I do not understand what xs:choice inside xs:sequence mean?

<xs:element name="sports-content">
  <xs:complexType>
    <xs:sequence>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element name="sports-metadata" />
        <xs:element name="sports-event" />
        <xs:element name="tournament" />
        <xs:element name="schedule" />
      </xs:choice>
    </xs:sequence>
  </xs:complexType>
</xs:element>

Ok. This XML will be valid.

<sports-content>
  <sports-metadata />
  <tournament />
</sports-content>

Will this XML be valid or not?

<sports-content>
  <sports-metadata />
  <tournament />
  <sports-metadata />
</sports-content>
xsd-validation xml-validation xml xsd
1 Answers

The xs:sequence element in your XSD is superfluous; it can be removed without affecting validity of any XML document. An xs:sequence around an xs:choice would be useful, for example, if you wanted the choice to always be preceded or followed by one or more elements in sequence.

Yes, both of the XML documents in your question are valid against your XSD (and will continue to be if you remove the xs:sequence wrapper around xs:choice.

user_2900850
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