Usage of the Attribute facet for referencing attributes

[fissim-at]

Hi,
I tried to use the attribute facet to define which entity should be referenced by an attribute. For example, defining that the RelatingSpace attribute of IfcRelSpaceBoundary2ndLevel must be an IfcSpace (https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRelSpaceBoundary2ndLevel.htm):

<specification name="Specification 1: IFCRELSPACEBOUNDARY2NDLEVEL" ifcVersion="IFC4X3_ADD2">
    <applicability minOccurs="1" maxOccurs="unbounded">
        <entity>
            <name>
                <simpleValue>IFCRELSPACEBOUNDARY2NDLEVEL</simpleValue>
            </name>
        </entity>
    </applicability>
    <requirements>
        <attribute cardinality="required">
            <name>
                <simpleValue>RelatingSpace</simpleValue>
            </name>
            <value>
                <simpleValue>IfcSpace</simpleValue>
            </value>
        </attribute>
    </requirements>
</specification>

The IDS documentation states that only enumerated attributes in the documentation might be specified (because the others are inverse ones). However, the enumerated ones have again two types: ones with explicit values like Name or Description and ones with references to other entities, like for the RelatingSpace attribute. It seems IDS only allows attributes with explicit values. The example above does comply with the IDS schema, but the IDS audit tool, for example, does not allow it.

Is the attribute facet intended to be used for this case?

Thanks!