<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE SystemDefinition [

<!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

  long-name CDATA #IMPLIED

  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

  long-name CDATA #IMPLIED

>

<!ELEMENT subblock (collection)*>

<!-- Cellular Baseband Services, Networking Services, etc -->

<!ATTLIST subblock

  name CDATA #REQUIRED

  long-name CDATA #IMPLIED

>

<!ELEMENT collection (component)*>

<!-- Screen Driver, Content Handling, etc -->

<!ATTLIST collection

  name CDATA #REQUIRED

  long-name CDATA #IMPLIED

  level NMTOKEN #IMPLIED

>

<!ELEMENT component (unit)*>

<!-- contains units or is a  package or prebuilt -->

<!ATTLIST component

  name CDATA #REQUIRED

  long-name CDATA #IMPLIED

  deprecated CDATA #IMPLIED

  introduced CDATA #IMPLIED

  contract CDATA #IMPLIED

  plugin (Y|N) "N"

  filter CDATA #IMPLIED

  class NMTOKENS #IMPLIED

  supports CDATA #IMPLIED

  purpose ( optional | mandatory | development ) "optional"

>

<!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="Symbian^4" schema="2.0.1">

  <systemModel>

    <layer name="mw" long-name="Middleware" levels="generic specific">

      <block name="helix" level="generic" long-name="Helix" levels="plugin framework server generic specific">

        <collection name="helix_ren" long-name="Helix Engine" level="framework">

          <!-- what does "ren" stand for? -->

          <component name="helix_stub" filter="s60" long-name="Helix Stub" introduced="^2" class="api">

            <unit bldFile="/sf/mw/helix/helix_ren/helix_stub/group"/>

          </component>

        </collection>

      </block>

    </layer>

  </systemModel>

</SystemDefinition>