The goal is to have atleast 1 element of either the value type or the patternedValue type in the column element. The patternedValue elements must come after the value elements.
<xs:complexType name="column">
    <xs:sequence>
<xs:choice>
  <xs:choice>
      <xs:element name="value" type="value" minOccurs="1">
      </xs:element>
      <xs:element name="patternedvalue" type="patternedValue" minOccurs="1">
      </xs:element>
  </xs:choice>
  <xs:choice>
      <xs:element name="value" type="value" minOccurs="1">
      </xs:element>
      <xs:element name="patternedvalue" type="patternedValue" minOccurs="1">
      </xs:element>
  </xs:choice>
  <xs:element name="value" type="value" minOccurs="1">
  </xs:element>
  <xs:element name="patternedvalue" type="patternedValue" minOccurs="1">
  </xs:element>
</xs:choice>
    </xs:sequence>
  </xs:complexType>