Add hbz element 961

src/main/java/de/gwdg/metadataqa/marc/definition/tags/hbztags/Tag961.java

@@ -0,0 +1,40 @@
+package de.gwdg.metadataqa.marc.definition.tags.hbztags;
+
+import de.gwdg.metadataqa.marc.definition.Cardinality;
+import de.gwdg.metadataqa.marc.definition.structure.DataFieldDefinition;
+import de.gwdg.metadataqa.marc.definition.structure.Indicator;
+
+/**
+ * Sonstige Standardnummer
+ */
+public class Tag961 extends DataFieldDefinition {
+
+  private static Tag961 uniqueInstance;
+
+  private Tag961() {
+    initialize();
+    postCreation();
+  }
+
+  public static Tag961 getInstance() {
+    if (uniqueInstance == null)
+      uniqueInstance = new Tag961();
+    return uniqueInstance;
+  }
+
+  private void initialize() {
+    tag = "961";
+    label = "Sonstige Standardnummer";
+    mqTag = "SonstigeStandardnummer";
+    cardinality = Cardinality.Repeatable;
+    // descriptionUrl = "https://service-wiki.hbz-nrw.de/nebenbei/cgi/anonymous_display_only.pl?pageId=717357250";
+
+    ind1 = new Indicator();
+    ind2 = new Indicator();
+
+    setSubfieldsWithCardinality(
+      "a",	"Sonstige Standardnummer", "R"
+    );
+
+  }
+}