Multischema audit too strict

[atomczak]

The audit is currently too strict when it comes to IDS with multiple IFC schemas allowed. I want to express: "no matter what version of IFC you have, if there is Facility or Building, it should have property XYZ", but the audit respond with an error saying that 2x3 can't have an IfcFacility. It should allow a sum of entities, not an union.

Example:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ids:ids xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://standards.buildingsmart.org/IDS http://standards.buildingsmart.org/IDS/1.0/ids.xsd" xmlns:ids="http://standards.buildingsmart.org/IDS">
	<!--edited with usBIM.IDSeditor 2.2.8.0 (http://www.accasoftware.com)-->
	<ids:info>
		<ids:title>New ids file</ids:title>
	</ids:info>
	<ids:specifications>
		<ids:specification ifcVersion="IFC2X3 IFC4 IFC4X3_ADD2" name="New Specification">
			<ids:applicability minOccurs="0" maxOccurs="unbounded">
				<ids:entity>
					<ids:name>
						<xs:restriction base="xs:string">
							<xs:enumeration value="IFCFACILITY"/>
							<xs:enumeration value="IFCBUILDING"/>
						</xs:restriction>
					</ids:name>
				</ids:entity>
			</ids:applicability>
			<ids:requirements>
				<ids:property cardinality="required">
					<ids:propertySet>
						<ids:simpleValue>ABC</ids:simpleValue>
					</ids:propertySet>
					<ids:baseName>
						<ids:simpleValue>XYZ</ids:simpleValue>
					</ids:baseName>
				</ids:property>
			</ids:requirements>
		</ids:specification>
	</ids:specifications>
</ids:ids>

(came up in the sustainability group discussion from Nick Nisbeth who is building the sustainability IDS)