Added helper method to lookup for inverse relations regardless of the upper/lower case in the relation encoding

src/main/java/eu/dnetlib/dhp/schema/common/ModelSupport.java

@@ -158,6 +158,21 @@ public class ModelSupport {
 		}
 	}
 
+	/**
+	 * Helper method: lookup relation inverse, given the direct relation encoding (case insensitive)
+	 * @param encoding
+	 * @return the relation inverse descriptor, throws @IllegalArgumentException when not found.
+	 */
+	public static RelationInverse findInverse(String encoding) {
+		return ModelSupport.relationInverseMap
+				.entrySet()
+				.stream()
+				.filter(r -> encoding.equalsIgnoreCase(r.getKey()))
+				.findFirst()
+				.map(r -> r.getValue())
+				.orElseThrow(() -> new IllegalArgumentException("invalid relationship: " + encoding));
+	}
+
 	/**
 	 * Helper method: fina a relation filtering by a relation name
  	 * @param relationName
@@ -181,7 +196,7 @@ public class ModelSupport {
 	 * @return
 	 */
 	public static String rel(String relType, String subRelType, String relClass) {
-		return String.format("%s-%s-%s", relType, subRelType, relClass);
+		return String.format("%s_%s_%s", relType, subRelType, relClass);
 	}
 
 	private static final String schemeTemplate = "dnet:%s_%s_relations";