start = Domain
Domain =
  element Domain {
    # still having some problems with included documents ... 
    #      the included document is given the attribute xml:base ...
    #      but my schema does not permit this ... 
    # 
    #      This almost generates the correct schema ... but it
    #      doesn't have the correct schemaLocation
    # 
    # <attribute ns="http://www.w3.org/XML/1998/namespace" name="base">
    #	<data type="anyURI"/>
    # </attribute>
    attribute xml:base { xsd:anyURI }?,
    attribute id { xsd:ID },
    DocDef,
    element Imports { Domain* }?,
    element Modules {
      element ModuleClass { ModuleDef }*
    }?,
    element Devices {
      element Device {
        attribute id { xsd:Name },
        DocDef,
        Characteristics?,
        Modules?,
        element SubDevices {
          element SubDevice {
            attribute id { xsd:Name },
            DocDef,
            Characteristics?,
            Modules?
          }*
        }?
      }*
    }?
  }
Characteristics =
  element Characteristics {
    element Characteristic {
      attribute name { text },
      attribute optional { xsd:boolean }?,
      attribute value { text }?,
      DocDef,
      SimpleType
    }+
  }
DataTypeDef =
  # Discuss: Doc on DataType?
  attribute unitOfMeasure { text }?,
  (StructType | ArrayType | SimpleType)
StructType =
  element Struct {
    attribute name { text }?,
    DataTypeDef+
  }
ArrayType =
  element Array {
    attribute name { text }?,
    DataTypeDef
  }
SimpleType =
  element SimpleType {
    attribute name { text }?,
    attribute type { BasicType }
    #  TODO Constraints Perhaps directly in DataTypeDef
    
  }
BasicType =
  "integer"
  | "boolean"
  | "string"
  | "byte"
  | "float"
  | "array"
  | "enum"
  | "date"
  | "time"
  | "datetime"
  | "blob"
  | "uri"
DocText =
  (text
   | element em { text }
   | element b { text }
   | element tt { text })*
# <Doc> element is always optional
DocDef =
  element Doc {
    DocText
    | (element p { DocText }
       | element img {
           attribute src { text },
           element caption { text }
         })*
  }?
ModuleDef =
  attribute name { text },
  attribute optional { xsd:boolean }?,
  element extends {
    attribute domain { xsd:IDREF },
    attribute class { text }
  }?,
  DocDef,
  Characteristics?,
  Actions?,
  Data?,
  Events?
Modules =
  element Modules {
    element Module { ModuleDef }*
  }
Actions =
  element Actions {
    element Action {
      attribute name { text },
      attribute optional { xsd:boolean }?,
      DocDef,
      DataTypeDef?,
      ArgDef?
    }*
  }
ArgDef =
  element Args {
    element Arg {
      attribute name { text },
      DocDef,
      DataTypeDef
    }*
  }
Data =
  element Data {
    element DataPoint {
      attribute name { text },
      attribute optional { xsd:boolean }?,
      attribute writable { xsd:boolean }?,
      attribute readable { xsd:boolean }?,
      attribute eventable { xsd:boolean }?,
      DocDef,
      DataTypeDef
    }*
  }
Events =
  element Events {
    element Event {
      attribute name { text },
      attribute optional { xsd:boolean }?,
      DocDef,
      Data?
    }*
  }