From 8b25b29efae09c5e1c76f4183471e21615cfe420 Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Sat, 3 Sep 2022 11:53:43 +1000
Subject: [PATCH] Add testcase for non-rooted classifications

---
 Documentation/testcases-classification.md     | 463 ++++++++++--------
 ...sification_references_should_also_pass.ids |  23 +
 ...sification_references_should_also_pass.ifc |  25 +
 3 files changed, 314 insertions(+), 197 deletions(-)
 create mode 100644 Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ids
 create mode 100644 Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ifc

diff --git a/Documentation/testcases-classification.md b/Documentation/testcases-classification.md
index 7fef3fa..fda4c16 100644
--- a/Documentation/testcases-classification.md
+++ b/Documentation/testcases-classification.md
@@ -9,20 +9,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$); /* Testcase */
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$); /* Testcase */
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/fail-a_classification_facet_with_no_data_matches_any_classification_1_2.ids) - [Sample IFC: 4](testcases/fail-a_classification_facet_with_no_data_matches_any_classification_1_2.ifc)
@@ -34,20 +36,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$); /* Testcase */
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$); /* Testcase */
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-a_classification_facet_with_no_data_matches_any_classification_2_2.ids) - [Sample IFC: 5](testcases/pass-a_classification_facet_with_no_data_matches_any_classification_2_2.ifc)
@@ -63,20 +67,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$); /* Testcase */
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$); /* Testcase */
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-values_should_match_exactly_if_lightweight_classifications_are_used.ids) - [Sample IFC: 5](testcases/pass-values_should_match_exactly_if_lightweight_classifications_are_used.ifc)
@@ -92,24 +98,57 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$); /* Testcase */
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$); /* Testcase */
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-values_match_subreferences_if_full_classifications_are_used__e_g__ef_25_10_should_match_ef_25_10_25__ef_25_10_30__etc_.ids) - [Sample IFC: 11](testcases/pass-values_match_subreferences_if_full_classifications_are_used__e_g__ef_25_10_should_match_ef_25_10_25__ef_25_10_30__etc_.ifc)
 
+## [PASS] Non-rooted resources that have external classification references should also pass
+
+~~~xml
+<classification minOccurs="1" maxOccurs="1">
+  <value>
+    <simpleValue>1</simpleValue>
+  </value>
+</classification>
+~~~
+
+~~~lua
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
+#2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
+#6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
+#9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
+#12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
+#13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$); /* Testcase */
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
+~~~
+
+[Sample IDS](testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ids) - [Sample IFC: 16](testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ifc)
+
 ## [PASS] Systems should match exactly 1/5
 
 ~~~xml
@@ -121,20 +160,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$); /* Testcase */
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$); /* Testcase */
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-systems_should_match_exactly_1_5.ids) - [Sample IFC: 1](testcases/pass-systems_should_match_exactly_1_5.ifc)
@@ -150,20 +191,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$); /* Testcase */
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$); /* Testcase */
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/fail-systems_should_match_exactly_2_5.ids) - [Sample IFC: 4](testcases/fail-systems_should_match_exactly_2_5.ifc)
@@ -179,20 +222,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$); /* Testcase */
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$); /* Testcase */
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-systems_should_match_exactly_3_5.ids) - [Sample IFC: 5](testcases/pass-systems_should_match_exactly_3_5.ifc)
@@ -208,20 +253,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$); /* Testcase */
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$); /* Testcase */
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-systems_should_match_exactly_4_5.ids) - [Sample IFC: 8](testcases/pass-systems_should_match_exactly_4_5.ifc)
@@ -237,20 +284,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$); /* Testcase */
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$); /* Testcase */
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-systems_should_match_exactly_5_5.ids) - [Sample IFC: 11](testcases/pass-systems_should_match_exactly_5_5.ifc)
@@ -268,20 +317,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$); /* Testcase */
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$); /* Testcase */
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-restrictions_can_be_used_for_values_1_3.ids) - [Sample IFC: 5](testcases/pass-restrictions_can_be_used_for_values_1_3.ifc)
@@ -299,20 +350,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$); /* Testcase */
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$); /* Testcase */
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-restrictions_can_be_used_for_values_2_3.ids) - [Sample IFC: 8](testcases/pass-restrictions_can_be_used_for_values_2_3.ifc)
@@ -330,20 +383,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$); /* Testcase */
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$); /* Testcase */
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/fail-restrictions_can_be_used_for_values_3_3.ids) - [Sample IFC: 11](testcases/fail-restrictions_can_be_used_for_values_3_3.ifc)
@@ -361,20 +416,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$); /* Testcase */
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$); /* Testcase */
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/fail-restrictions_can_be_used_for_systems_1_2.ids) - [Sample IFC: 4](testcases/fail-restrictions_can_be_used_for_systems_1_2.ifc)
@@ -392,20 +449,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$); /* Testcase */
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$); /* Testcase */
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-restrictions_can_be_used_for_systems_2_2.ids) - [Sample IFC: 5](testcases/pass-restrictions_can_be_used_for_systems_2_2.ifc)
@@ -424,20 +483,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$); /* Testcase */
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$); /* Testcase */
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/pass-both_system_and_value_must_match__all__not_any__if_specified_1_2.ids) - [Sample IFC: 5](testcases/pass-both_system_and_value_must_match__all__not_any__if_specified_1_2.ifc)
@@ -456,20 +517,22 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$); /* Testcase */
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$); /* Testcase */
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11),#12);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
 ~~~
 
 [Sample IDS](testcases/fail-both_system_and_value_must_match__all__not_any__if_specified_2_2.ids) - [Sample IFC: 8](testcases/fail-both_system_and_value_must_match__all__not_any__if_specified_2_2.ifc)
@@ -485,30 +548,32 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#16,#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8,#18),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11,#17),#12);
-#16=IFCWALL('3gjhpoGY54T8ZY2eLSU6Mj',$,$,$,$,$,$,$,$); /* Testcase */
-#17=IFCWALLTYPE('3bLBNhMpT68fl5VCu2b9fk',$,$,$,$,$,$,$,$,.ELEMENTEDWALL.);
-#18=IFCRELDEFINESBYTYPE('3iDG_WdzrCCeybZ$O3bcLV',$,$,$,(#16),#17);
-#19=IFCCLASSIFICATION($,$,$,'Foobaz',$,$,$);
-#20=IFCRELASSOCIATESCLASSIFICATION('3mVzrKNQHEsQ3do0idBpgM',$,$,$,(#1),#19);
-#21=IFCCLASSIFICATIONREFERENCE($,'X',$,#19,$,$);
-#22=IFCRELASSOCIATESCLASSIFICATION('1$lAD_gez30QRAVfOBq0DZ',$,$,$,(#17),#21);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#19,#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
+#18=IFCWALL('1Hoe864RLCMfsimgi$p0Zv',$,$,$,$,$,$,$,$); /* Testcase */
+#19=IFCWALLTYPE('1qo0u2EmLBDwJMHIHcUclj',$,$,$,$,$,$,$,$,.ELEMENTEDWALL.);
+#20=IFCRELDEFINESBYTYPE('1TxtOCsrv9E8VmTlRMIyqS',$,$,$,(#18),#19);
+#21=IFCCLASSIFICATION($,$,$,'Foobaz',$,$,$);
+#22=IFCRELASSOCIATESCLASSIFICATION('1pqmjPvlvEdec$YRQVO$_M',$,$,$,(#1),#21);
+#23=IFCCLASSIFICATIONREFERENCE($,'X',$,#21,$,$);
+#24=IFCRELASSOCIATESCLASSIFICATION('1K4EX9vyj29Q$Y0qFvOb1O',$,$,$,(#19),#23);
 ~~~
 
-[Sample IDS](testcases/pass-occurrences_override_the_type_classification_per_system_1_3.ids) - [Sample IFC: 16](testcases/pass-occurrences_override_the_type_classification_per_system_1_3.ifc)
+[Sample IDS](testcases/pass-occurrences_override_the_type_classification_per_system_1_3.ids) - [Sample IFC: 18](testcases/pass-occurrences_override_the_type_classification_per_system_1_3.ifc)
 
 ## [FAIL] Occurrences override the type classification per system 2/3
 
@@ -521,30 +586,32 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#16,#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8,#18),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11,#17),#12);
-#16=IFCWALL('3gjhpoGY54T8ZY2eLSU6Mj',$,$,$,$,$,$,$,$); /* Testcase */
-#17=IFCWALLTYPE('3bLBNhMpT68fl5VCu2b9fk',$,$,$,$,$,$,$,$,.ELEMENTEDWALL.);
-#18=IFCRELDEFINESBYTYPE('3iDG_WdzrCCeybZ$O3bcLV',$,$,$,(#16),#17);
-#19=IFCCLASSIFICATION($,$,$,'Foobaz',$,$,$);
-#20=IFCRELASSOCIATESCLASSIFICATION('3mVzrKNQHEsQ3do0idBpgM',$,$,$,(#1),#19);
-#21=IFCCLASSIFICATIONREFERENCE($,'X',$,#19,$,$);
-#22=IFCRELASSOCIATESCLASSIFICATION('1$lAD_gez30QRAVfOBq0DZ',$,$,$,(#17),#21);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#19,#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
+#18=IFCWALL('1Hoe864RLCMfsimgi$p0Zv',$,$,$,$,$,$,$,$); /* Testcase */
+#19=IFCWALLTYPE('1qo0u2EmLBDwJMHIHcUclj',$,$,$,$,$,$,$,$,.ELEMENTEDWALL.);
+#20=IFCRELDEFINESBYTYPE('1TxtOCsrv9E8VmTlRMIyqS',$,$,$,(#18),#19);
+#21=IFCCLASSIFICATION($,$,$,'Foobaz',$,$,$);
+#22=IFCRELASSOCIATESCLASSIFICATION('1pqmjPvlvEdec$YRQVO$_M',$,$,$,(#1),#21);
+#23=IFCCLASSIFICATIONREFERENCE($,'X',$,#21,$,$);
+#24=IFCRELASSOCIATESCLASSIFICATION('1K4EX9vyj29Q$Y0qFvOb1O',$,$,$,(#19),#23);
 ~~~
 
-[Sample IDS](testcases/fail-occurrences_override_the_type_classification_per_system_2_3.ids) - [Sample IFC: 16](testcases/fail-occurrences_override_the_type_classification_per_system_2_3.ifc)
+[Sample IDS](testcases/fail-occurrences_override_the_type_classification_per_system_2_3.ids) - [Sample IFC: 18](testcases/fail-occurrences_override_the_type_classification_per_system_2_3.ifc)
 
 ## [PASS] Occurrences override the type classification per system 3/3
 
@@ -557,28 +624,30 @@ These testcases are designed to help describe behaviour in edge cases and ambigu
 ~~~
 
 ~~~lua
-#1=IFCPROJECT('1YKJbs5jj6dh3MtS0j2OK2',$,$,$,$,$,$,$,$);
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
 #2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
-#3=IFCRELASSOCIATESCLASSIFICATION('00BJZTWcfFCg0RbkiKv1fM',$,$,$,(#1),#2);
-#4=IFCWALL('2UleVhRgnCfgW5SttZE_7y',$,$,$,$,$,$,$,$);
-#5=IFCWALL('2W7F_ccg94rwa1nsWn0b0j',$,$,$,$,$,$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
 #6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
-#7=IFCRELASSOCIATESCLASSIFICATION('3jbMAz3Of0M9$GsA4vnQIB',$,$,$,(#5),#6);
-#8=IFCWALL('2jD97aGmz9kQB0ecAchgic',$,$,$,$,$,$,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
 #9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
-#10=IFCRELASSOCIATESCLASSIFICATION('2cx4Wu97n869Aqk3DiPKpW',$,$,$,(#16,#8),#9);
-#11=IFCWALL('3O2yN0uPz5l8zU4bMKTOyE',$,$,$,$,$,$,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8,#18),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
 #12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
 #13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
-#15=IFCRELASSOCIATESCLASSIFICATION('3OTcVvSHf7RvGHzaEB8x6S',$,$,$,(#11,#17),#12);
-#16=IFCWALL('3gjhpoGY54T8ZY2eLSU6Mj',$,$,$,$,$,$,$,$); /* Testcase */
-#17=IFCWALLTYPE('3bLBNhMpT68fl5VCu2b9fk',$,$,$,$,$,$,$,$,.ELEMENTEDWALL.);
-#18=IFCRELDEFINESBYTYPE('3iDG_WdzrCCeybZ$O3bcLV',$,$,$,(#16),#17);
-#19=IFCCLASSIFICATION($,$,$,'Foobaz',$,$,$);
-#20=IFCRELASSOCIATESCLASSIFICATION('3mVzrKNQHEsQ3do0idBpgM',$,$,$,(#1),#19);
-#21=IFCCLASSIFICATIONREFERENCE($,'X',$,#19,$,$);
-#22=IFCRELASSOCIATESCLASSIFICATION('1$lAD_gez30QRAVfOBq0DZ',$,$,$,(#17),#21);
-~~~
-
-[Sample IDS](testcases/pass-occurrences_override_the_type_classification_per_system_3_3.ids) - [Sample IFC: 16](testcases/pass-occurrences_override_the_type_classification_per_system_3_3.ifc)
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#19,#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
+#18=IFCWALL('1Hoe864RLCMfsimgi$p0Zv',$,$,$,$,$,$,$,$); /* Testcase */
+#19=IFCWALLTYPE('1qo0u2EmLBDwJMHIHcUclj',$,$,$,$,$,$,$,$,.ELEMENTEDWALL.);
+#20=IFCRELDEFINESBYTYPE('1TxtOCsrv9E8VmTlRMIyqS',$,$,$,(#18),#19);
+#21=IFCCLASSIFICATION($,$,$,'Foobaz',$,$,$);
+#22=IFCRELASSOCIATESCLASSIFICATION('1pqmjPvlvEdec$YRQVO$_M',$,$,$,(#1),#21);
+#23=IFCCLASSIFICATIONREFERENCE($,'X',$,#21,$,$);
+#24=IFCRELASSOCIATESCLASSIFICATION('1K4EX9vyj29Q$Y0qFvOb1O',$,$,$,(#19),#23);
+~~~
+
+[Sample IDS](testcases/pass-occurrences_override_the_type_classification_per_system_3_3.ids) - [Sample IFC: 18](testcases/pass-occurrences_override_the_type_classification_per_system_3_3.ifc)
 
diff --git a/Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ids b/Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ids
new file mode 100644
index 0000000..d20bafa
--- /dev/null
+++ b/Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ids
@@ -0,0 +1,23 @@
+<ids xmlns="http://standards.buildingsmart.org/IDS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://standards.buildingsmart.org/IDS/ids_05.xsd">
+    <info>
+        <title>Non-rooted resources that have external classification references should also pass</title>
+    </info>
+    <specifications>
+        <specification name="Non-rooted resources that have external classification references should also pass" ifcVersion="IFC2X3 IFC4" minOccurs="1" maxOccurs="1">
+            <applicability>
+                <entity>
+                    <name>
+                        <simpleValue>IfcMaterial</simpleValue>
+                    </name>
+                </entity>
+            </applicability>
+            <requirements>
+                <classification minOccurs="1" maxOccurs="1">
+                    <value>
+                        <simpleValue>1</simpleValue>
+                    </value>
+                </classification>
+            </requirements>
+        </specification>
+    </specifications>
+</ids>
\ No newline at end of file
diff --git a/Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ifc b/Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ifc
new file mode 100644
index 0000000..92d3c98
--- /dev/null
+++ b/Documentation/testcases/pass-non_rooted_resources_that_have_external_classification_references_should_also_pass.ifc
@@ -0,0 +1,25 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
+FILE_NAME('','2022-09-03T11:52:02',(),(),'IfcOpenShell v0.7.0-dc67287d','IfcOpenShell v0.7.0-dc67287d','');
+FILE_SCHEMA(('IFC4'));
+ENDSEC;
+DATA;
+#1=IFCPROJECT('1mFhjNgIf39vp2hwsY8_Nu',$,$,$,$,$,$,$,$);
+#2=IFCCLASSIFICATION($,$,$,'Foobar',$,$,$);
+#3=IFCRELASSOCIATESCLASSIFICATION('0eKYrcU715Txx29QQW0mSK',$,$,$,(#1),#2);
+#4=IFCWALL('2VUxnjRE92exWomb15MCdk',$,$,$,$,$,$,$,$);
+#5=IFCWALL('0bENrhnlH5tA5tP1RGnZVU',$,$,$,$,$,$,$,$);
+#6=IFCCLASSIFICATIONREFERENCE($,'1',$,#2,$,$);
+#7=IFCRELASSOCIATESCLASSIFICATION('3U6tJPx8P6GQevy3zKetip',$,$,$,(#5),#6);
+#8=IFCWALL('3XLP4STI58Yw_Bb3mH6Flv',$,$,$,$,$,$,$,$);
+#9=IFCCLASSIFICATIONREFERENCE($,'11',$,#2,$,$);
+#10=IFCRELASSOCIATESCLASSIFICATION('0ZSK_HpK5ELvIdH2qzflyq',$,$,$,(#8),#9);
+#11=IFCWALL('38y5mb6IP36Ro6QdJAJ3nb',$,$,$,$,$,$,$,$);
+#12=IFCCLASSIFICATIONREFERENCE($,'22',$,#13,$,$);
+#13=IFCCLASSIFICATIONREFERENCE($,'2',$,#2,$,$);
+#15=IFCRELASSOCIATESCLASSIFICATION('3SpJQJSLz0FhhOKO5_9z_e',$,$,$,(#11),#12);
+#16=IFCMATERIAL('Material',$,$);
+#17=IFCEXTERNALREFERENCERELATIONSHIP($,$,#6,(#16));
+ENDSEC;
+END-ISO-10303-21;