<?xml version="1.0"?>
<!DOCTYPE SystemDefinition1 [
<!ELEMENT SystemDefinition ( systemModel )>
<!ATTLIST SystemDefinition
  name CDATA #REQUIRED
  schema CDATA #REQUIRED
>
<!-- all paths are relative to the environment variable specified by the root attribute, or SOURCEROOT if not.  -->

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

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

<!ELEMENT block (subblock* | collection*)*>
 <!-- Generic OS services, Comms Services, etc -->
<!ATTLIST block
  levels NMTOKENS #IMPLIED
  span CDATA #IMPLIED
  level NMTOKEN #IMPLIED
  name CDATA #REQUIRED
>

<!ELEMENT subblock (collection)*>
<!-- Cellular Baseband Services, Networking Services, etc -->
<!ATTLIST subblock
  name CDATA #REQUIRED
>

<!ELEMENT collection (component)*>
<!-- Screen Driver, Content Handling, etc -->
<!ATTLIST collection
  name CDATA #REQUIRED
  level NMTOKEN #IMPLIED
>

<!ELEMENT component (unit)*>
<!-- contains units or is a  package or prebuilt -->
<!ATTLIST component
  name CDATA #REQUIRED
  deprecated CDATA #IMPLIED
  introduced CDATA #IMPLIED
  contract CDATA #IMPLIED
  plugin (Y|N) "N"
  filter CDATA #IMPLIED
  class NMTOKENS #IMPLIED
  supports CDATA #IMPLIED
>

<!ELEMENT unit EMPTY >
<!-- must be buildable (bld.inf) -->
<!-- bldFile  may someday be removed in favour of mrp -->
<!ATTLIST unit
  mrp CDATA #IMPLIED
  filter CDATA #IMPLIED
  bldFile CDATA #IMPLIED
  root CDATA #IMPLIED
  version NMTOKEN #IMPLIED
  prebuilt NMTOKEN #IMPLIED
  late (Y|N) #IMPLIED
  priority CDATA #IMPLIED
>

]>
<SystemDefinition name="TCL" schema="2.0.0">
	<systemModel>
		<layer name="Unclassified">
			<collection name="foo1">
				<component name="foo2" filter="foo1">
					<unit mrp="an.mrp"/>
				</component>
			</collection>
		</layer>
		<layer name="bar1">
			<block name="bar2">
				<collection name="bar3">
					<component name="bar4" filter="bar1">
						<unit mrp="another.mrp"/>
					</component>
				</collection>
			</block>
		</layer>
		<layer name="bash" levels="low">
			<block name="bash2" level="low">
				<collection name="bash2">
					<component name="bash3" filter="bash4">
						<unit mrp="yetanother.mrp"/>
					</component>
				</collection>
				<collection name="bash5">
					<component name="bash6" filter="bash4">
						<unit bldFile="group" mrp="fudge.mrp"/>
					</component>
				</collection>
			</block>
		</layer>
	</systemModel>
</SystemDefinition>