chg idno to ISBN and ISSN

gfl-plugin/src/main/resources/gfl-indexer.xslt

@@ -329,10 +329,15 @@ Refer to comments in the code to understand the used algorithm.
                      <xsl:value-of select="date/normalize-space()"/>
                   </field>
                </xsl:if>
-               <xsl:if test="idno!=''">
-                  <field name="idno">
-                     <xsl:value-of select="idno/normalize-space()"/> 
-                  </field>
+               <xsl:if test="idno !='' and idno[@type = 'ISBN']">
+                     <field name="ISBN"> 
+                        <xsl:value-of select="idno/normalize-space()"/>
+                     </field>   
+               </xsl:if>
+               <xsl:if test="idno !='' and idno[@type = 'ISSN']">
+                  <field name="ISSN"> 
+                     <xsl:value-of select="idno/normalize-space()"/>
+                  </field>   
                </xsl:if>   
            </doc>
            </xsl:for-each>

solr/gfl/conf/schema.xml

@@ -82,7 +82,8 @@
   <field name="pub_place" type="string" multiValued="true"/>
   <field name="publisher" type="string" multiValued="true"/>
   <field name="pub_date" type="string" multiValued="true"/>
-  <field name="idno" type="string" />
+  <field name="ISSN" type="string" />
+  <field name="ISBN" type="string" />
   <field name="extent" type="string" multiValued="true"/>
   <field name="biblScope" type="string" multiValued="true"/>