schema question

Hi,

Given the schema below, is there a way to fix the 'limitations' outlined in the schema as a comment?

If you have any questions, please verify with me.

Thanks.


<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:moby="http://www.biomoby.org/moby" elementFormDefault="qualified" attributeFormDefault="qualified" targetNamespace="http://www.biomoby.org/moby">
      <xs:element name="BasicGFFSequenceFeature" type="moby:BasicGFFSequenceFeatureType"/>
      <xs:complexType name="BasicGFFSequenceFeatureType">
            <xs:sequence>
                  <xs:element name="String" type="moby:stringType0" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="String" type="moby:stringType1" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="String" type="moby:stringType2" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="String" type="moby:stringType3" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="String" type="moby:stringType4" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="String" type="moby:stringType5" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="Integer" type="moby:integerType1" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="Integer" type="moby:integerType2" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="Float" type="moby:floatType2" minOccurs="1" maxOccurs="1"/>
                  <!-- key/value pair object for key/value pairs with a 1:many relationship-->
                  <xs:element name="multi_key_value_pair" type="moby:multi_key_value_pairType3" minOccurs="1" maxOccurs="unbounded">
      </xs:element>
            </xs:sequence>
            <xs:attribute name="namespace" use="required" form="qualified" type="xs:string"/>
            <xs:attribute name="id" use="required" form="qualified" type="xs:string"/>
            <xs:attribute name="articleName" use="required" form="qualified"/>
      </xs:complexType>
      <xs:complexType name="stringType0">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="reference"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="stringType1">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="frame"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="stringType2">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="phase"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="stringType3">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="method"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="stringType4">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="strand"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="stringType5">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="source"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="integerType1">
            <xs:simpleContent>
                  <xs:extension base="xs:integer">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="start"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="integerType2">
            <xs:simpleContent>
                  <xs:extension base="xs:integer">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="stop"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="floatType2">
            <xs:simpleContent>
                  <xs:extension base="xs:float">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="score"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>

<!--
      Limitations:
        1. Order matters - can this be fixed?
        2. bounded elements must be placed before unbounded elements. Can this be fixed?
        3. > 1 unbounded element causes an error. Can this be fixed?
-->

      <xs:complexType name="stringType7">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="key"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="stringType6">
            <xs:simpleContent>
                  <xs:extension base="xs:string">
                        <xs:attribute name="articleName" use="required" form="qualified" fixed="value"/>
                        <xs:attribute name="id" use="required" form="qualified"/>
                        <xs:attribute name="namespace" use="required" form="qualified"/>
                  </xs:extension>
            </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="multi_key_value_pairType3">
            <xs:sequence>
                  <xs:element name="String" type="moby:stringType7" minOccurs="1" maxOccurs="1"/>
                  <xs:element name="String" type="moby:stringType6" minOccurs="1" maxOccurs="unbounded"/>
            </xs:sequence>
            <xs:attribute name="namespace" use="required" form="qualified" type="xs:string"/>
            <xs:attribute name="id" use="required" form="qualified" type="xs:string"/>
            <xs:attribute name="articleName" use="required" form="qualified" fixed="column9_tag_value" type="xs:string"/>
      </xs:complexType>
</xs:schema>
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