diff --git a/examples/morphological_lexicon/megla.xml b/examples/morphological_lexicon/megla.xml
index 04a437b..b4b7de1 100644
--- a/examples/morphological_lexicon/megla.xml
+++ b/examples/morphological_lexicon/megla.xml
@@ -2,7 +2,7 @@
   <entry>
     <head>
       <headword>
-	<lemma orthography_id="343" dynamic_accentuation_id="81" pronunciation_id="32" hyphenation_id="99" tonemic_accentuation_id="777">agencija</lemma>
+	<lemma orthography_ids="342" dynamic_accentuation_ids="81|83" pronunciation_ids="32" hyphenation_ids="" tonemic_accentuation_ids="85">agencija</lemma>
       </headword>
       <lexicalUnit sloleksId="LE_c77074df05d2719216d477bd01d418ad" sloleksKey="S_megla" type="single">
 	<lexeme lexical_unit_lexeme_id="83224">megla</lexeme>
diff --git a/resources/schema/inventory.xsd b/resources/schema/inventory.xsd
index 6a155b9..4311d8c 100644
--- a/resources/schema/inventory.xsd
+++ b/resources/schema/inventory.xsd
@@ -23,11 +23,11 @@
             </xsd:restriction>
           </xsd:simpleType>
         </xsd:attribute>
-        <xsd:attribute name="orthography_id" type="xsd:integer"/>
-        <xsd:attribute name="dynamic_accentuation_id" type="xsd:integer"/>
-        <xsd:attribute name="tonemic_accentuation_id" type="xsd:integer"/>
-        <xsd:attribute name="pronunciation_id" type="xsd:integer"/>
-        <xsd:attribute name="hyphenation_id" type="xsd:integer"/>
+        <xsd:attribute name="orthography_ids" type="xsd:string"/>
+        <xsd:attribute name="dynamic_accentuation_ids" type="xsd:string"/>
+        <xsd:attribute name="tonemic_accentuation_ids" type="xsd:string"/>
+        <xsd:attribute name="pronunciation_ids" type="xsd:string"/>
+        <xsd:attribute name="hyphenation_ids" type="xsd:string"/>
         <xsd:attribute name="norm">
           <xsd:simpleType>
             <xsd:restriction base="xsd:string">
