Hallo!

I'm trying to represent a mathematical formula with XML and cannot find the correct schema definition.

I.e:
<formula>
  <plus>
    <minus>
      ..
    </minus>
    <plus>
      ..
    </plus>
    <minus>
      ..
    </minus>
  </plus>
</formula>


What I want is that, for example, <plus> can have any number of unordered <plus> and <minus> elements.

This does not work:
<xsd:complexType name="plus">
  <xsd:sequence>
    <xsd:choice>
      <xsd:element name="plus" type="plus"></xsd:element>
      <xsd:element name="minus" type="minus"></xsd:element>
    </xsd:choice>
  </xsd:sequence>
</xsd:complexType>


Thanks,
  Ralph


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