From b64dcfd4b830f0f04168c52bfc1bc2db2088b441 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Sat, 19 Apr 2025 09:21:22 +0200
Subject: [PATCH] Fix compilation on schemas prior to ifc4 #6549

---
 src/serializers/schema_dependent/XmlSerializer.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/serializers/schema_dependent/XmlSerializer.cpp b/src/serializers/schema_dependent/XmlSerializer.cpp
index 5f3c3ccf70..e98b0fbe4e 100644
--- a/src/serializers/schema_dependent/XmlSerializer.cpp
+++ b/src/serializers/schema_dependent/XmlSerializer.cpp
@@ -305,6 +305,7 @@ ptree* descend(ifcopenshell::geometry::abstract_mapping* mapping, IfcSchema::Ifc
 			<IfcSchema::IfcObject, IfcSchema::IfcRelDefinesByProperties, IfcSchema::IfcPropertySetDefinition>
 			(object, &IfcSchema::IfcObject::IsDefinedBy, &IfcSchema::IfcRelDefinesByProperties::RelatingPropertyDefinition);
 
+#ifdef SCHEMAS_HAS_IfcPropertySetDefinitionSet
 		aggregate_of<IfcSchema::IfcPropertySetDefinitionSet>::ptr property_set_sets = get_related
 			<IfcSchema::IfcObject, IfcSchema::IfcRelDefinesByProperties, IfcSchema::IfcPropertySetDefinitionSet>
 			(object, &IfcSchema::IfcObject::IsDefinedBy, &IfcSchema::IfcRelDefinesByProperties::RelatingPropertyDefinition);
@@ -312,6 +313,7 @@ ptree* descend(ifcopenshell::geometry::abstract_mapping* mapping, IfcSchema::Ifc
 		for (auto& s : *property_set_sets) {
 			 property_sets->push((decltype(property_sets))*s);
 		}
+#endif
 
 		for (IfcSchema::IfcPropertySetDefinition::list::it it = property_sets->begin(); it != property_sets->end(); ++it) {
 			IfcSchema::IfcPropertySetDefinition* pset = *it;