<!ELEMENT SystemDefinition (systemModel?, build?)>
<!ATTLIST SystemDefinition
  name CDATA #REQUIRED
  schema CDATA #REQUIRED
>
<!-- all paths are relative to the root of the source -->

<!-- System Model Section of DTD -->
<!ELEMENT systemModel (layer+)>

<!ELEMENT layer (logicalset* | module*)*>
<!-- Kernel Services, Base Services, OS Services, Etc -->
<!ATTLIST layer
  name CDATA #REQUIRED
  levels CDATA #IMPLIED
  span CDATA #IMPLIED
>

<!ELEMENT logicalset (logicalsubset* | module* | unit* | package* | prebuilt*)*>
 <!-- Generic OS services, Comms Services, etc -->
<!ATTLIST logicalset 
  name CDATA #REQUIRED
  levels CDATA #IMPLIED  
  span CDATA #IMPLIED
  level CDATA #IMPLIED
>

<!ELEMENT logicalsubset (module* | unit* | package* | prebuilt*)*>
<!-- Telephony services, Networking Services, etc -->
<!ATTLIST logicalsubset 
  name CDATA #REQUIRED
>

<!ELEMENT module (component* | unit* | package* | prebuilt*)*>
<!-- Screen Driver, Content Handling, etc -->
<!ATTLIST module
  name CDATA #REQUIRED
  level CDATA #IMPLIED  
>

<!ELEMENT component (unit* | package* | prebuilt*)*>
<!-- units or packages -->
<!ATTLIST component
  name CDATA #REQUIRED
>

<!ELEMENT unit EMPTY >
<!-- must be buildable (bld.inf) -->
<!-- bldFile will soon be removed in favour of mrp -->
<!ATTLIST unit
  unitID ID #REQUIRED
  name CDATA #REQUIRED
  mrp CDATA #REQUIRED
  filter CDATA #IMPLIED
  bldFile CDATA #REQUIRED
  priority CDATA #IMPLIED
  contract CDATA #IMPLIED
>

<!ELEMENT package EMPTY >
<!-- like a unit, but not buildable -->
<!ATTLIST package
  name CDATA #REQUIRED
  mrp CDATA #REQUIRED
  filter CDATA #IMPLIED
  contract CDATA #IMPLIED
>

<!ELEMENT prebuilt EMPTY>
<!-- pre-built CBR component -->
<!ATTLIST prebuilt
  name CDATA #REQUIRED
  version CDATA #REQUIRED
  late (Y|N) #IMPLIED
  filter CDATA #IMPLIED
  contract CDATA #IMPLIED
>



<!-- Build Section of DTD -->
<!ELEMENT build (option* | target+ | targetList+ | unitList+ | configuration+)*>

<!ELEMENT unitList (unitRef+)>
<!-- e.g. common, beech, cedar, etc -->
<!ATTLIST unitList
  name ID #REQUIRED
  description CDATA #REQUIRED
>

<!ELEMENT unitRef EMPTY>
<!-- Reference to unit in System Model -->
<!ATTLIST unitRef
  unit IDREF #REQUIRED
>

<!ELEMENT targetList EMPTY>
<!-- e.g. DEFAULT_7.0S, TOOLS_7.0S, etc -->
<!ATTLIST targetList
  name ID #REQUIRED
  description CDATA #REQUIRED
  target IDREFS #REQUIRED
>

<!ELEMENT target EMPTY>
<!-- e.g. WINS, WINSCW, ARM4, etc -->
<!ATTLIST target
  name ID #REQUIRED
  abldTarget CDATA #REQUIRED
  description CDATA #REQUIRED
>

<!ELEMENT option EMPTY>
<!-- e.g. Keepgoing, SaveSpace, etc -->
<!ATTLIST option
  name ID #REQUIRED
  abldOption CDATA #REQUIRED
  description CDATA #REQUIRED
  enable (Y | N | y | n) #REQUIRED
>

<!ELEMENT configuration (unitListRef+ | layerRef+ | task+)*>
<!-- 7.0s, 8.0a, 8.0b, cuskit, etc -->
<!ATTLIST configuration
  name ID #REQUIRED
  description CDATA #REQUIRED
  filter CDATA #REQUIRED
>
<!ELEMENT task ( unitListRef* , (buildLayer | specialInstructions))>

<!ELEMENT unitListRef EMPTY>
<!-- Reference to unitList -->
<!ATTLIST unitListRef
  unitList IDREF #REQUIRED
>

<!ELEMENT layerRef EMPTY>
<!-- Reference to named entity in the model, usually a layer -->
<!ATTLIST layerRef
  layerName CDATA #REQUIRED
>

<!ELEMENT buildLayer EMPTY>
<!-- bldmake, abld export, etc -->
<!ATTLIST buildLayer
  command CDATA #REQUIRED
  targetList IDREFS #IMPLIED
  unitParallel (Y | N | y | n) #REQUIRED
  targetParallel (Y | N | y | n) #IMPLIED
>

<!ELEMENT specialInstructions EMPTY>
<!-- BootStrap -->
<!ATTLIST specialInstructions
  name CDATA #REQUIRED
  cwd CDATA #REQUIRED
  command CDATA #REQUIRED
>