issue #75: add tag SSD

src/main/java/de/gwdg/metadataqa/marc/definition/tags/bltags/TagSSD.java

@@ -0,0 +1,45 @@
+package de.gwdg.metadataqa.marc.definition.tags.bltags;
+
+import de.gwdg.metadataqa.marc.definition.Cardinality;
+import de.gwdg.metadataqa.marc.definition.DataFieldDefinition;
+import de.gwdg.metadataqa.marc.definition.Indicator;
+
+/**
+ * STM Serials Designation
+ */
+public class TagSSD extends DataFieldDefinition {
+
+  private static TagSSD uniqueInstance;
+
+  private TagSSD() {
+    initialize();
+    postCreation();
+  }
+
+  public static TagSSD getInstance() {
+    if (uniqueInstance == null)
+      uniqueInstance = new TagSSD();
+    return uniqueInstance;
+  }
+
+  private void initialize() {
+
+    tag = "SSD";
+    label = "STM Serials Designation";
+    mqTag = "STMSerialsDesignation";
+    cardinality = Cardinality.Repeatable;
+    // descriptionUrl = "https://www.loc.gov/marc/bibliographic/bd037.html";
+    // setCompilanceLevels("O");
+    obsolete = true;
+
+    ind1 = new Indicator();
+
+    ind2 = new Indicator();
+
+    setSubfieldsWithCardinality(
+      "a", "STM serials designation and linking data", "NR"
+    );
+
+    getSubfield("a").setMqTag("stmSerialsDesignation");
+  }
+}

src/test/java/de/gwdg/metadataqa/marc/definition/tags/bltags/TagSSDTest.java

@@ -0,0 +1,21 @@
+package de.gwdg.metadataqa.marc.definition.tags.bltags;
+
+import org.junit.Test;
+
+public class TagSSDTest extends BLTagTest {
+
+  public TagSSDTest() {
+    super(TagSSD.getInstance());
+  }
+
+  @Test
+  public void testValidFields() {
+    validField("a", "25500$a1st (1936) - 31st ed. (1983); 50300$aContinued as \"International ABC aerospace directory\", q.v");
+  }
+
+  @Test
+  public void testInvalidFields() {
+    invalidField("1", "a", "Y");
+    invalidField("c", "a");
+  }
+}