+ /*
+ * the mapping to chromosome (genome) is held as an instance with
+ * source = speciesId
+ * version = assemblyId
+ * accessionId = "chromosome:" + chromosomeId
+ * map = mapping from sequence to reference assembly
+ */
+ public static final String CHROMOSOME = "chromosome";
+
+ private String source = "";
+
+ private String version = "";
+
+ private String ucversion;
+
+ private String accessionId = "";
+
+ int sourceKey = Integer.MIN_VALUE;
+
+ String canonicalSourceName;
+
+