IssueID #1102: wrapped explanation with list and made translation optional

examples/bilingual_dictionaries/vsms1.xml

@@ -61,7 +61,7 @@
                 <label type="type3">value7</label>
               </labelList>
               <translation targetLang="hun" source="source1">hiša</translation>
-              <explanation/>
+              <explanationList/>
             </translationContainer>
             <translationContainer cluster="1">
               <translation targetLang="hun">dom</translation>

resources/schema/inventory.xsd

@@ -309,8 +309,13 @@
   <xsd:complexType name="translationContainerType">
     <xsd:sequence>
       <xsd:element name="labelList" type="labelListType" minOccurs="0"/>
-      <xsd:element name="translation" type="translationType"/>
-      <xsd:element name="explanation" type="xsd:string" minOccurs="0"/> <!-- hmm: what's expected here? -->
+      <xsd:choice>
+        <xsd:sequence>
+          <xsd:element name="translation" type="translationType"/>
+          <xsd:element name="explanationList" type="explanationListType" minOccurs="0"/>
+        </xsd:sequence>
+        <xsd:element name="explanationList" type="explanationListType"/>
+      </xsd:choice>
     </xsd:sequence>
     <xsd:attribute name="cluster" type="xsd:int"/> <!-- number identifying a group of clustered translations -->
     <xsd:attribute name="source" type="xsd:string"/> <!-- hmm, we already have @source under translationType, that's not enough? -->
@@ -323,6 +328,13 @@
     </xsd:sequence>
   </xsd:complexType>
   
+  <!-- List of explanations -->
+  <xsd:complexType name="explanationListType">
+    <xsd:sequence>
+      <xsd:element name="explanation" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/>
+    </xsd:sequence>
+  </xsd:complexType>
+
   <!-- Wrapper including an example and (possibly) its translation -->
   <xsd:complexType name="exampleContainerType">
     <xsd:sequence>