missing appinfo attributes

[iamdrscott]

Some of the new appinfo attributes we have discussed do not appear in the current branch. I guess maybe I was supposed to add them.

• I think we still need externalImportIndicator. (We don't need externalAdapterTypeindicator now that we have structures:AdapterType)

• Attribute augmentations won't work without augmentingNamespaces. (see Augmentations/04-AugCCWithA/niem-core.xsd)

  <xs:attribute name="augmentingNamespace" type="appinfo:URIListSimpleType">
  <xs:annotation>
    <xs:documentation>A list of URIs for namespaces responsible for an attribute augmentation.</xs:documentation>
  </xs:annotation>
  </xs:attribute>

• Augmenting simple content with complex content won't work without referenceAttributeIndicator. (see Augmentations/06-AugSCWithE/messageModel.xsd)

  <xs:attribute name="referenceAttributeIndicator">
  <xs:annotation>
    <xs:documentation>True if an attribute is a list of object references (IDREFs or URIs).</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:boolean">
      <xs:pattern value="true"/>
    </xs:restriction>
  </xs:simpleType>
  </xs:attribute>

• We replaced structures:sequenceID with orderedPropertyIndicator. (see NIEM 6.0 Architectural Changes §2.9)

  <xs:attribute name="orderedPropertyIndicator">
  <xs:annotation>
    <xs:documentation>True if the order of a repeated property is significant.</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:boolean">
      <xs:pattern value="true"/>
    </xs:restriction>
  </xs:simpleType>
  </xs:attribute>

• We replaced structures:relationshipMetadata with relationshipPropertyIndicator. (see NIEM 6.0 Architectural Changes §2.12

  <xs:attribute name="relationshipPropertyIndicator">
  <xs:annotation>
    <xs:documentation>True if a property applies to the relationship between an element and its parent.</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:boolean">
      <xs:pattern value="true"/>
    </xs:restriction>
  </xs:simpleType>
  </xs:attribute>

I think we can replace the restriction of xs:boolean with type="xs:boolean" defalt="false"

[iamdrscott]

Completed by #93