add new field article_title that contain parent-title

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

@@ -116,6 +116,7 @@ Refer to comments in the code to understand the used algorithm.
       </xsl:if>
    </xsl:template>
    
+   <!-- scraping the gnd database for meta data the result is marc21 with works with numbers as identifyer -->
    <xsl:template match="marc:record">
       <xsl:choose>
          <xsl:when test="marc:datafield[@tag='100']">
@@ -258,7 +259,6 @@ Refer to comments in the code to understand the used algorithm.
                   </field>
                </xsl:for-each>
                <!-- TITLE -->
-               
                   <xsl:for-each select="title">
                      <xsl:choose>
                         <xsl:when test="./@type = 'main'">
@@ -649,6 +649,9 @@ Refer to comments in the code to understand the used algorithm.
                <field name="article_id">
                   <xsl:value-of select="$context/@xml:id" />
                </field>
+               <field name="article_title">
+                  <xsl:value-of select="//title[@type='desc']/normalize-space()" />
+               </field>
                <field name="doctype">page</field>
                <field name="page_number">
                   <xsl:value-of select="$pageNumber" />

solr/gfl/conf/schema.xml

@@ -91,6 +91,7 @@
     
    <!-- for doctype 'page' -->
    <field name="article_id" type="string" />
+   <field name="article_title" type="string" />
    <field name="page_number" type="int" />
    <field name="html_page" type="text_de" multiValued="false" />
    <field name="image_ids" type="string" multiValued="true"/>