diff --git a/resources/schema/lexonomy.xsd b/resources/schema/lexonomy.xsd
index 9b21285..4ce9f3e 100644
--- a/resources/schema/lexonomy.xsd
+++ b/resources/schema/lexonomy.xsd
@@ -30,7 +30,7 @@
         <xsd:complexType>
           <xsd:simpleContent>
             <xsd:extension base="xsd:string">
-              <xsd:attribute name="lexical_unit_lexeme_id" type="xsd:int" use="required"/>
+              <xsd:attribute name="lexical_unit_lexeme_id" type="xsd:int"/>
             </xsd:extension>
           </xsd:simpleContent>
         </xsd:complexType>
@@ -60,7 +60,7 @@
 
   <xsd:complexType name="grammarType">
     <xsd:sequence>
-      <xsd:element name="category" type="categoryType"/>
+      <xsd:element name="category" type="categoryType" minOccurs="0"/>
     </xsd:sequence>
   </xsd:complexType>
 
@@ -131,7 +131,7 @@
 
   <xsd:complexType name="translationContainerType">
     <xsd:sequence>
-      <xsd:element name="labelList" type="labelListType"/>
+      <xsd:element name="labelList" type="labelListType" minOccurs="0"/>
       <xsd:element name="translation" type="translationType"/>
       <xsd:element name="explanation" type="xsd:string" minOccurs="0"/>
     </xsd:sequence>
@@ -148,14 +148,14 @@
     <xsd:sequence>
       <xsd:element name="h" type="xsd:string"/>
     </xsd:sequence>
-    <xsd:attribute name="corpus_id" type="xsd:int" use="required"/>
-    <xsd:attribute name="modified" type="xsd:string" use="required"/>
+    <xsd:attribute name="corpus_id" type="xsd:int"/>
+    <xsd:attribute name="modified" type="xsd:string"/>
   </xsd:complexType>
 
   <xsd:complexType name="exampleContainerType">
     <xsd:sequence>
       <xsd:element name="example" type="exampleType"/>
-      <xsd:element name="translationContainer" type="translationContainerType"/>
+      <xsd:element name="translationContainer" type="translationContainerType" minOccurs="0"/>
     </xsd:sequence>
   </xsd:complexType>
 
@@ -169,7 +169,7 @@
     <xsd:complexType>
       <xsd:sequence>
         
-        <xsd:element name="entry">
+        <xsd:element name="entry" minOccurs="0" maxOccurs="unbounded">
           <xsd:complexType>
             <xsd:sequence>
 
@@ -178,12 +178,12 @@
                   <xsd:sequence>
                     <xsd:element name="status" type="xsd:string"/>
 	            <xsd:element name="headword" type="headwordType"/>
-	            <xsd:element name="lexical_unit" type="lexical_unitType"/>
-                    <xsd:element name="grammar" type="grammarType"/>
-                    <xsd:element name="measureList" type="measureListType"/>
-                    <xsd:element name="variantList" type="variantListType"/>
-                    <xsd:element name="labelList" type="labelListType"/>
-	            <xsd:element name="comment" type="xsd:string"/>
+	            <xsd:element name="lexical_unit" type="lexical_unitType" minOccurs="0"/>
+                    <xsd:element name="grammar" type="grammarType" minOccurs="0"/>
+                    <xsd:element name="measureList" type="measureListType" minOccurs="0"/>
+                    <xsd:element name="variantList" type="variantListType" minOccurs="0"/>
+                    <xsd:element name="labelList" type="labelListType" minOccurs="0"/>
+	            <xsd:element name="comment" type="xsd:string" minOccurs="0"/>
                   </xsd:sequence>
                 </xsd:complexType>
               </xsd:element>
@@ -194,15 +194,15 @@
                     <xsd:element name="senseList">
                       <xsd:complexType>
                         <xsd:sequence>
-                          <xsd:element name="sense" maxOccurs="unbounded">
+                          <xsd:element name="sense" minOccurs="0" maxOccurs="unbounded">
                             <xsd:complexType>
                               <xsd:sequence>
-                                <xsd:element name="labelList" type="labelListType"/>
-                                <xsd:element name="definitionList" type="definitionListType"/>
-                                <xsd:element name="translationContainerList" type="translationContainerListType"/>
-                                <xsd:element name="exampleContainerList" type="exampleContainerListType"/>
+                                <xsd:element name="labelList" type="labelListType" minOccurs="0"/>
+                                <xsd:element name="definitionList" type="definitionListType" minOccurs="0"/>
+                                <xsd:element name="translationContainerList" type="translationContainerListType" minOccurs="0"/>
+                                <xsd:element name="exampleContainerList" type="exampleContainerListType" minOccurs="0"/>
                               </xsd:sequence>
-                              <xsd:attribute name="id" type="xsd:int" use="required"/>
+                              <xsd:attribute name="id" type="xsd:int"/>
                             </xsd:complexType>
                           </xsd:element>
                         </xsd:sequence>