option to force xsd schema check for required field (geonetwork#8294)

* option to force xsd schema check for required field

* remove xsd schema check in form builder is required logic

* adjust label xml check before dtd checking

web/src/main/webapp/xslt/ui-metadata/form-builder.xsl

@@ -106,21 +106,26 @@
 
     <xsl:variable name="isoType" select="if (../@gco:isoType) then ../@gco:isoType else ''"/>
 
+    <xsl:variable name="elementCondition" select="gn-fn-metadata:getLabel($schema, name(), $labels, name(..),$isoType, $xpath)/condition" />
+
     <!-- Required status is defined in parent element for
     some profiles like ISO19139. If not set, the element
     editing information is used.
     In view mode, always set to false.
     -->
     <xsl:variable name="isRequired" as="xs:boolean">
       <xsl:choose>
+        <xsl:when test="$elementCondition = 'mandatory'">
+          <xsl:value-of select="true()"/>
+        </xsl:when>
+        <xsl:when test="$elementCondition = 'optional'">
+          <xsl:value-of select="false()"/>
+        </xsl:when>
         <xsl:when
           test="($parentEditInfo and $parentEditInfo/@min = 1 and $parentEditInfo/@max = 1) or
           (not($parentEditInfo) and $editInfo and $editInfo/@min = 1 and $editInfo/@max = 1)">
           <xsl:value-of select="true()"/>
         </xsl:when>
-        <xsl:when test="gn-fn-metadata:getLabel($schema, name(), $labels, name(..),$isoType, $xpath)/condition = 'mandatory'">
-          <xsl:value-of select="true()"/>
-        </xsl:when>
         <xsl:otherwise>
           <xsl:value-of select="false()"/>
         </xsl:otherwise>