SYS_PARAMETER in XML generated in Creo Schematics

SYS_PARAMETER - what is it?

<PORT name="4" physicalName="4" >
<SYS_PARAMETER id="obj686919693-104" />
<PARAMETER name="ENTRY_PORT" value="4"/>
<PARAMETER name="LAYER" value="DEF_LINES"/>
<PARAMETER name="NAME_FORMAT" value="#"/>

id="obj686919693 - is it harness?

-104" - what is it?