scheme.xml

<model package="gxTest" baseClass="xPDOObject" platform="mysql" defaultEngine="MyISAM" version="1.1">

	<object class="gxBox" table="gx_box" extends="xPDOSimpleObject">
		<field key="title" dbtype="varchar" precision="255" phptype="string" null="false"/>
		<field key="properties" dbtype="text" phptype="string" null="false"/>

		<field key="class_alias" dbtype="varchar" precision="255" phptype="string" null="false"/>

		<composite alias="gxBoxWater"       class="gxBoxWater"      local="id" foreign="id" cardinality="one" owner="local"/>
		<composite alias="gxBoxAutomobil"   class="gxBoxAutomobil"  local="id" foreign="id" cardinality="one" owner="local"/>
	</object>

	<object class="gxBoxWater" table="gx_box_water" extends="xPDOSimpleObject">
		<field key="pressure" dbtype="int" precision="11" phptype="integer" null="false"/>
		<field key="speed" dbtype="int" precision="11" phptype="integer" null="false"/>
		<field key="beasts" dbtype="varchar" precision="255" phptype="string" null="false"/>

		<aggregate alias="gxBox" class="gxBox" local="id" foreign="id" cardinality="one" owner="foreign"/>
	</object>

	<object class="gxBoxAutomobil" table="gx_box_automobil" extends="xPDOSimpleObject">
		<field key="wheels" dbtype="int" precision="11" phptype="integer" null="false"/>
		<field key="has_truck" dbtype="tinyint" precision="1" phptype="boolean" null="false"/>
		<field key="truck_volume" dbtype="int" precision="11" phptype="integer" null="false"/>

		<aggregate alias="gxBox" class="gxBox" local="id" foreign="id" cardinality="one" owner="foreign"/>
	</object>

	<object class="gdBox" table="gd_box" extends="xPDOSimpleObject">
		<field key="title" dbtype="varchar" precision="255" phptype="string" null="false"/>
		<field key="properties" dbtype="text" phptype="string" null="false"/>

		<field key="class_key" dbtype="varchar" precision="255" phptype="string" null="false"/>

		<composite alias="gdBoxWater"       class="gdBoxWater"      local="id" foreign="id" cardinality="one" owner="local"/>
		<composite alias="gdBoxAutomobil"   class="gdBoxAutomobil"  local="id" foreign="id" cardinality="one" owner="local"/>
	</object>

	<object class="gdBoxWater" table="gd_box_water" extends="xPDOSimpleObject">
		<field key="pressure" dbtype="int" precision="11" phptype="integer" null="false"/>
		<field key="speed" dbtype="int" precision="11" phptype="integer" null="false"/>
		<field key="beasts" dbtype="varchar" precision="255" phptype="string" null="false"/>

		<aggregate alias="gdBox" class="gdBox" local="id" foreign="id" cardinality="one" owner="foreign"/>
	</object>

	<object class="gdBoxAutomobil" table="gd_box_automobil" extends="xPDOSimpleObject">
		<field key="wheels" dbtype="int" precision="11" phptype="integer" null="false"/>
		<field key="has_truck" dbtype="tinyint" precision="1" phptype="boolean" null="false"/>
		<field key="truck_volume" dbtype="int" precision="11" phptype="integer" null="false"/>

		<aggregate alias="gdBox" class="gdBox" local="id" foreign="id" cardinality="one" owner="foreign"/>
	</object>

</model>