diff --git a/source/vocab/details.ttl b/source/vocab/details.ttl
index b6c011b2..5db461f1 100644
--- a/source/vocab/details.ttl
+++ b/source/vocab/details.ttl
@@ -215,6 +215,13 @@
     owl:propertyChainAxiom ( [ rdfs:subPropertyOf :identifiedBy ; rdfs:range :ISBN ] :value ) ;
     rdfs:range :ISBN .
 
+:ismn a owl:DatatypeProperty ;
+    :category :shorthand;
+    rdfs:label "ISMN";
+    rdfs:subPropertyOf :identifier ;
+    owl:propertyChainAxiom ( [ rdfs:subPropertyOf :identifiedBy ; rdfs:range :ISMN ] :value ) ;
+    rdfs:range :ISMN .
+
 :issn a owl:DatatypeProperty ;
     :category :shorthand;
     rdfs:label "ISSN";
diff --git a/source/vocab/libris-search-experimental.ttl b/source/vocab/libris-search-experimental.ttl
index 6c7fae5f..c3ae4ba0 100644
--- a/source/vocab/libris-search-experimental.ttl
+++ b/source/vocab/libris-search-experimental.ttl
@@ -15,13 +15,19 @@
 
 :isbn rdfs:domain :Instance ; # See ./details.ttl for full definition of :isbn
     :category :searchfilter ;
-    skos:notation "bath.isbn"^^ls:QueryCode .
+    skos:notation "bath.isbn"^^ls:QueryCode ;
+    rdfs:subPropertyOf ls:isxn .
+
+:ismn rdfs:domain :Instance ; # See ./details.ttl for full definition of :ismn
+    :category :searchfilter ;
+    rdfs:subPropertyOf ls:isxn .
 
 # TODO cataloging also searches identifiedBy / marc:canceledIssn, marc:incorrectIssn, marc:issnL, marc:canceledIssnL
 # webbsök has FELN / LINKISXN
 :issn rdfs:domain :Instance ; # See ./details.ttl for full definition of :issn
     :category :searchfilter ;
-    skos:notation "bath.issn"^^ls:QueryCode .
+    skos:notation "bath.issn"^^ls:QueryCode ;
+    rdfs:subPropertyOf ls:isxn .
 
 :lccn rdfs:domain :Instance ; # See ./details.ttl for full definition of :lccn
     :category :searchfilter ;
@@ -115,6 +121,10 @@ ls:composite a skos:Collection ;
     :category :pending ;
     :code "composite" .
 
+ls:isxn a owl:DatatypeProperty ;
+    :category ls:composite, :pending, :searchfilter ;
+    rdfs:label "ISXN"@sv, "ISXN"@en .
+
 ls:itemHeldBy a owl:ObjectProperty ;
     rdfs:label "Bibliotek"@sv, "Library"@en ;
     skos:notation "bath.possessingInstitution"^^ls:QueryCode ;
@@ -220,6 +230,12 @@ ls:itemCreated a owl:DatatypeProperty ;
      rdfs:range xsd:dateTime ;
      owl:propertyChainAxiom ( :hasItem :meta :created ) .
 
+ls:itemSubject a owl:DatatypeProperty ;
+     :category :shorthand, :pending, :searchfilter ;
+     rdfs:label "lokalt ämnesord"@sv, "item subject"@en ;
+     rdfs:domain :Instance ;
+     owl:propertyChainAxiom ( :hasItem :subject ) .
+
 # TODO
 #ls:classificationCode a owl:DatatypeProperty ;
 #    :category :shorthand ;