Repository: incubator-commonsrdf
Updated Branches:
  refs/heads/master 67db96f68 -> 5ee4c293c


http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/main/java/org/apache/commons/rdf/simple/Types.java
----------------------------------------------------------------------
diff --git a/simple/src/main/java/org/apache/commons/rdf/simple/Types.java 
b/simple/src/main/java/org/apache/commons/rdf/simple/Types.java
index 12d37a2..d202b8b 100644
--- a/simple/src/main/java/org/apache/commons/rdf/simple/Types.java
+++ b/simple/src/main/java/org/apache/commons/rdf/simple/Types.java
@@ -17,296 +17,374 @@
  */
 package org.apache.commons.rdf.simple;
 
+import org.apache.commons.rdf.api.IRI;
+
 import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Optional;
 import java.util.Set;
 
-import org.apache.commons.rdf.api.IRI;
-
 /**
  * Types from the RDF and XML Schema vocabularies.
- *
  */
 public final class Types implements IRI {
 
-       /** <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML</tt> */
-       public static final Types RDF_HTML = new Types(
-                       "http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML";);
-
-       /** <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#langString</tt> */
-       public static final Types RDF_LANGSTRING = new Types(
-                       
"http://www.w3.org/1999/02/22-rdf-syntax-ns#langString";);
-
-       /**
-        * <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral</tt>
-        * 
-        * @deprecated Not used in RDF-1.1
-        */
-       @Deprecated
-       public static final Types RDF_PLAINLITERAL = new Types(
-                       
"http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral";);
-
-       /** <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral</tt> */
-       public static final Types RDF_XMLLITERAL = new Types(
-                       
"http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#anyURI</tt> */
-       public static final Types XSD_ANYURI = new Types(
-                       "http://www.w3.org/2001/XMLSchema#anyURI";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#base64Binary</tt> */
-       public static final Types XSD_BASE64BINARY = new Types(
-                       "http://www.w3.org/2001/XMLSchema#base64Binary";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#boolean</tt> */
-       public static final Types XSD_BOOLEAN = new Types(
-                       "http://www.w3.org/2001/XMLSchema#boolean";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#byte</tt> */
-       public static final Types XSD_BYTE = new Types(
-                       "http://www.w3.org/2001/XMLSchema#byte";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#date</tt> */
-       public static final Types XSD_DATE = new Types(
-                       "http://www.w3.org/2001/XMLSchema#date";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#dateTime</tt> */
-       public static final Types XSD_DATETIME = new Types(
-                       "http://www.w3.org/2001/XMLSchema#dateTime";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#dayTimeDuration</tt> */
-       public static final Types XSD_DAYTIMEDURATION = new Types(
-                       "http://www.w3.org/2001/XMLSchema#dayTimeDuration";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#decimal</tt> */
-       public static final Types XSD_DECIMAL = new Types(
-                       "http://www.w3.org/2001/XMLSchema#decimal";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#double</tt> */
-       public static final Types XSD_DOUBLE = new Types(
-                       "http://www.w3.org/2001/XMLSchema#double";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#duration</tt> */
-       public static final Types XSD_DURATION = new Types(
-                       "http://www.w3.org/2001/XMLSchema#duration";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#float</tt> */
-       public static final Types XSD_FLOAT = new Types(
-                       "http://www.w3.org/2001/XMLSchema#float";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#gDay</tt> */
-       public static final Types XSD_GDAY = new Types(
-                       "http://www.w3.org/2001/XMLSchema#gDay";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#gMonth</tt> */
-       public static final Types XSD_GMONTH = new Types(
-                       "http://www.w3.org/2001/XMLSchema#gMonth";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#gMonthDay</tt> */
-       public static final Types XSD_GMONTHDAY = new Types(
-                       "http://www.w3.org/2001/XMLSchema#gMonthDay";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#gYear</tt> */
-       public static final Types XSD_GYEAR = new Types(
-                       "http://www.w3.org/2001/XMLSchema#gYear";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#gYearMonth</tt> */
-       public static final Types XSD_GYEARMONTH = new Types(
-                       "http://www.w3.org/2001/XMLSchema#gYearMonth";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#hexBinary</tt> */
-       public static final Types XSD_HEXBINARY = new Types(
-                       "http://www.w3.org/2001/XMLSchema#hexBinary";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#int</tt> */
-       public static final Types XSD_INT = new Types(
-                       "http://www.w3.org/2001/XMLSchema#int";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#integer</tt> */
-       public static final Types XSD_INTEGER = new Types(
-                       "http://www.w3.org/2001/XMLSchema#integer";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#language</tt> */
-       public static final Types XSD_LANGUAGE = new Types(
-                       "http://www.w3.org/2001/XMLSchema#language";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#long</tt> */
-       public static final Types XSD_LONG = new Types(
-                       "http://www.w3.org/2001/XMLSchema#long";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#Name</tt> */
-       public static final Types XSD_NAME = new Types(
-                       "http://www.w3.org/2001/XMLSchema#Name";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#NCName</tt> */
-       public static final Types XSD_NCNAME = new Types(
-                       "http://www.w3.org/2001/XMLSchema#NCName";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#negativeInteger</tt> */
-       public static final Types XSD_NEGATIVEINTEGER = new Types(
-                       "http://www.w3.org/2001/XMLSchema#negativeInteger";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#NMTOKEN</tt> */
-       public static final Types XSD_NMTOKEN = new Types(
-                       "http://www.w3.org/2001/XMLSchema#NMTOKEN";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#nonNegativeInteger</tt> */
-       public static final Types XSD_NONNEGATIVEINTEGER = new Types(
-                       "http://www.w3.org/2001/XMLSchema#nonNegativeInteger";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#nonPositiveInteger</tt> */
-       public static final Types XSD_NONPOSITIVEINTEGER = new Types(
-                       "http://www.w3.org/2001/XMLSchema#nonPositiveInteger";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#normalizedString</tt> */
-       public static final Types XSD_NORMALIZEDSTRING = new Types(
-                       "http://www.w3.org/2001/XMLSchema#normalizedString";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#positiveInteger</tt> */
-       public static final Types XSD_POSITIVEINTEGER = new Types(
-                       "http://www.w3.org/2001/XMLSchema#positiveInteger";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#short</tt> */
-       public static final Types XSD_SHORT = new Types(
-                       "http://www.w3.org/2001/XMLSchema#short";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#string</tt> */
-       public static final Types XSD_STRING = new Types(
-                       "http://www.w3.org/2001/XMLSchema#string";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#time</tt> */
-       public static final Types XSD_TIME = new Types(
-                       "http://www.w3.org/2001/XMLSchema#time";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#token</tt> */
-       public static final Types XSD_TOKEN = new Types(
-                       "http://www.w3.org/2001/XMLSchema#token";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#unsignedByte</tt> */
-       public static final Types XSD_UNSIGNEDBYTE = new Types(
-                       "http://www.w3.org/2001/XMLSchema#unsignedByte";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#unsignedInt</tt> */
-       public static final Types XSD_UNSIGNEDINT = new Types(
-                       "http://www.w3.org/2001/XMLSchema#unsignedInt";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#unsignedLong</tt> */
-       public static final Types XSD_UNSIGNEDLONG = new Types(
-                       "http://www.w3.org/2001/XMLSchema#unsignedLong";);
-
-       /** <tt>http://www.w3.org/2001/XMLSchema#unsignedShort</tt> */
-       public static final Types XSD_UNSIGNEDSHORT = new Types(
-                       "http://www.w3.org/2001/XMLSchema#unsignedShort";);
-
-       private static final Set<IRI> ALL_TYPES;
-
-       static {
-               Set<IRI> tempTypes = new LinkedHashSet<>();
-               tempTypes.add(RDF_HTML);
-               tempTypes.add(RDF_LANGSTRING);
-               tempTypes.add(RDF_PLAINLITERAL);
-               tempTypes.add(RDF_XMLLITERAL);
-               tempTypes.add(XSD_ANYURI);
-               tempTypes.add(XSD_BASE64BINARY);
-               tempTypes.add(XSD_BOOLEAN);
-               tempTypes.add(XSD_BYTE);
-               tempTypes.add(XSD_DATE);
-               tempTypes.add(XSD_DATETIME);
-               tempTypes.add(XSD_DAYTIMEDURATION);
-               tempTypes.add(XSD_DECIMAL);
-               tempTypes.add(XSD_DOUBLE);
-               tempTypes.add(XSD_DURATION);
-               tempTypes.add(XSD_FLOAT);
-               tempTypes.add(XSD_GDAY);
-               tempTypes.add(XSD_GMONTH);
-               tempTypes.add(XSD_GMONTHDAY);
-               tempTypes.add(XSD_GYEAR);
-               tempTypes.add(XSD_GYEARMONTH);
-               tempTypes.add(XSD_HEXBINARY);
-               tempTypes.add(XSD_INT);
-               tempTypes.add(XSD_INTEGER);
-               tempTypes.add(XSD_LANGUAGE);
-               tempTypes.add(XSD_LONG);
-               tempTypes.add(XSD_NAME);
-               tempTypes.add(XSD_NCNAME);
-               tempTypes.add(XSD_NEGATIVEINTEGER);
-               tempTypes.add(XSD_NMTOKEN);
-               tempTypes.add(XSD_NONNEGATIVEINTEGER);
-               tempTypes.add(XSD_NONPOSITIVEINTEGER);
-               tempTypes.add(XSD_NORMALIZEDSTRING);
-               tempTypes.add(XSD_POSITIVEINTEGER);
-               tempTypes.add(XSD_SHORT);
-               tempTypes.add(XSD_STRING);
-               tempTypes.add(XSD_TIME);
-               tempTypes.add(XSD_TOKEN);
-               tempTypes.add(XSD_UNSIGNEDBYTE);
-               tempTypes.add(XSD_UNSIGNEDINT);
-               tempTypes.add(XSD_UNSIGNEDLONG);
-               tempTypes.add(XSD_UNSIGNEDSHORT);
-               ALL_TYPES = Collections.unmodifiableSet(tempTypes);
-       }
-
-       private final IRI field;
-
-       private Types(String field) {
-               this.field = new IRIImpl(field);
-       }
-
-       @Override
-       public String getIRIString() {
-               return this.field.getIRIString();
-       }
-
-       @Override
-       public String ntriplesString() {
-               return this.field.ntriplesString();
-       }
-
-       @Override
-       public boolean equals(Object other) {
-               return this.field.equals(other);
-       }
-
-       @Override
-       public int hashCode() {
-               return this.field.hashCode();
-       }
-
-       @Override
-       public String toString() {
-               return this.field.toString();
-       }
-
-       /**
-        * Get an immutable set of the IRIs used by the RDF-1.1 specification to
-        * define types, from the RDF and XML Schema vocabularies.
-        * 
-        * @return A {@link Set} containing all of the IRIs in this collection.
-        */
-       public static Set<IRI> values() {
-               return ALL_TYPES;
-       }
-
-       /**
-        * Get the IRI from this collection if it is present, or return
-        * {@link Optional#empty()} otherwise.
-        * 
-        * @param nextIRI
-        *            The IRI to look for.
-        * @return An {@link Optional} containing the IRI from this collection 
or
-        *         {@link Optional#empty()} if it is not present here.
-        */
-       public static Optional<IRI> get(IRI nextIRI) {
-               if (ALL_TYPES.contains(nextIRI)) {
-                       // If we know about this IRI, then look through our set 
to find the
-                       // object that matches and return it
-                       for (IRI nextType : ALL_TYPES) {
-                               if (nextType.equals(nextIRI)) {
-                                       return Optional.of(nextType);
-                               }
-                       }
-               }
-               return Optional.empty();
-       }
+    /**
+     * <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML</tt>
+     */
+    public static final Types RDF_HTML = new Types(
+            "http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML";);
+
+    /**
+     * <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#langString</tt>
+     */
+    public static final Types RDF_LANGSTRING = new Types(
+            "http://www.w3.org/1999/02/22-rdf-syntax-ns#langString";);
+
+    /**
+     * <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral</tt>
+     *
+     * @deprecated Not used in RDF-1.1
+     */
+    @Deprecated
+    public static final Types RDF_PLAINLITERAL = new Types(
+            "http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral";);
+
+    /**
+     * <tt>http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral</tt>
+     */
+    public static final Types RDF_XMLLITERAL = new Types(
+            "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#anyURI</tt>
+     */
+    public static final Types XSD_ANYURI = new Types(
+            "http://www.w3.org/2001/XMLSchema#anyURI";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#base64Binary</tt>
+     */
+    public static final Types XSD_BASE64BINARY = new Types(
+            "http://www.w3.org/2001/XMLSchema#base64Binary";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#boolean</tt>
+     */
+    public static final Types XSD_BOOLEAN = new Types(
+            "http://www.w3.org/2001/XMLSchema#boolean";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#byte</tt>
+     */
+    public static final Types XSD_BYTE = new Types(
+            "http://www.w3.org/2001/XMLSchema#byte";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#date</tt>
+     */
+    public static final Types XSD_DATE = new Types(
+            "http://www.w3.org/2001/XMLSchema#date";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#dateTime</tt>
+     */
+    public static final Types XSD_DATETIME = new Types(
+            "http://www.w3.org/2001/XMLSchema#dateTime";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#dayTimeDuration</tt>
+     */
+    public static final Types XSD_DAYTIMEDURATION = new Types(
+            "http://www.w3.org/2001/XMLSchema#dayTimeDuration";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#decimal</tt>
+     */
+    public static final Types XSD_DECIMAL = new Types(
+            "http://www.w3.org/2001/XMLSchema#decimal";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#double</tt>
+     */
+    public static final Types XSD_DOUBLE = new Types(
+            "http://www.w3.org/2001/XMLSchema#double";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#duration</tt>
+     */
+    public static final Types XSD_DURATION = new Types(
+            "http://www.w3.org/2001/XMLSchema#duration";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#float</tt>
+     */
+    public static final Types XSD_FLOAT = new Types(
+            "http://www.w3.org/2001/XMLSchema#float";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#gDay</tt>
+     */
+    public static final Types XSD_GDAY = new Types(
+            "http://www.w3.org/2001/XMLSchema#gDay";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#gMonth</tt>
+     */
+    public static final Types XSD_GMONTH = new Types(
+            "http://www.w3.org/2001/XMLSchema#gMonth";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#gMonthDay</tt>
+     */
+    public static final Types XSD_GMONTHDAY = new Types(
+            "http://www.w3.org/2001/XMLSchema#gMonthDay";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#gYear</tt>
+     */
+    public static final Types XSD_GYEAR = new Types(
+            "http://www.w3.org/2001/XMLSchema#gYear";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#gYearMonth</tt>
+     */
+    public static final Types XSD_GYEARMONTH = new Types(
+            "http://www.w3.org/2001/XMLSchema#gYearMonth";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#hexBinary</tt>
+     */
+    public static final Types XSD_HEXBINARY = new Types(
+            "http://www.w3.org/2001/XMLSchema#hexBinary";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#int</tt>
+     */
+    public static final Types XSD_INT = new Types(
+            "http://www.w3.org/2001/XMLSchema#int";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#integer</tt>
+     */
+    public static final Types XSD_INTEGER = new Types(
+            "http://www.w3.org/2001/XMLSchema#integer";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#language</tt>
+     */
+    public static final Types XSD_LANGUAGE = new Types(
+            "http://www.w3.org/2001/XMLSchema#language";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#long</tt>
+     */
+    public static final Types XSD_LONG = new Types(
+            "http://www.w3.org/2001/XMLSchema#long";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#Name</tt>
+     */
+    public static final Types XSD_NAME = new Types(
+            "http://www.w3.org/2001/XMLSchema#Name";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#NCName</tt>
+     */
+    public static final Types XSD_NCNAME = new Types(
+            "http://www.w3.org/2001/XMLSchema#NCName";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#negativeInteger</tt>
+     */
+    public static final Types XSD_NEGATIVEINTEGER = new Types(
+            "http://www.w3.org/2001/XMLSchema#negativeInteger";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#NMTOKEN</tt>
+     */
+    public static final Types XSD_NMTOKEN = new Types(
+            "http://www.w3.org/2001/XMLSchema#NMTOKEN";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#nonNegativeInteger</tt>
+     */
+    public static final Types XSD_NONNEGATIVEINTEGER = new Types(
+            "http://www.w3.org/2001/XMLSchema#nonNegativeInteger";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#nonPositiveInteger</tt>
+     */
+    public static final Types XSD_NONPOSITIVEINTEGER = new Types(
+            "http://www.w3.org/2001/XMLSchema#nonPositiveInteger";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#normalizedString</tt>
+     */
+    public static final Types XSD_NORMALIZEDSTRING = new Types(
+            "http://www.w3.org/2001/XMLSchema#normalizedString";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#positiveInteger</tt>
+     */
+    public static final Types XSD_POSITIVEINTEGER = new Types(
+            "http://www.w3.org/2001/XMLSchema#positiveInteger";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#short</tt>
+     */
+    public static final Types XSD_SHORT = new Types(
+            "http://www.w3.org/2001/XMLSchema#short";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#string</tt>
+     */
+    public static final Types XSD_STRING = new Types(
+            "http://www.w3.org/2001/XMLSchema#string";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#time</tt>
+     */
+    public static final Types XSD_TIME = new Types(
+            "http://www.w3.org/2001/XMLSchema#time";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#token</tt>
+     */
+    public static final Types XSD_TOKEN = new Types(
+            "http://www.w3.org/2001/XMLSchema#token";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#unsignedByte</tt>
+     */
+    public static final Types XSD_UNSIGNEDBYTE = new Types(
+            "http://www.w3.org/2001/XMLSchema#unsignedByte";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#unsignedInt</tt>
+     */
+    public static final Types XSD_UNSIGNEDINT = new Types(
+            "http://www.w3.org/2001/XMLSchema#unsignedInt";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#unsignedLong</tt>
+     */
+    public static final Types XSD_UNSIGNEDLONG = new Types(
+            "http://www.w3.org/2001/XMLSchema#unsignedLong";);
+
+    /**
+     * <tt>http://www.w3.org/2001/XMLSchema#unsignedShort</tt>
+     */
+    public static final Types XSD_UNSIGNEDSHORT = new Types(
+            "http://www.w3.org/2001/XMLSchema#unsignedShort";);
+
+    private static final Set<IRI> ALL_TYPES;
+
+    static {
+        Set<IRI> tempTypes = new LinkedHashSet<>();
+        tempTypes.add(RDF_HTML);
+        tempTypes.add(RDF_LANGSTRING);
+        tempTypes.add(RDF_PLAINLITERAL);
+        tempTypes.add(RDF_XMLLITERAL);
+        tempTypes.add(XSD_ANYURI);
+        tempTypes.add(XSD_BASE64BINARY);
+        tempTypes.add(XSD_BOOLEAN);
+        tempTypes.add(XSD_BYTE);
+        tempTypes.add(XSD_DATE);
+        tempTypes.add(XSD_DATETIME);
+        tempTypes.add(XSD_DAYTIMEDURATION);
+        tempTypes.add(XSD_DECIMAL);
+        tempTypes.add(XSD_DOUBLE);
+        tempTypes.add(XSD_DURATION);
+        tempTypes.add(XSD_FLOAT);
+        tempTypes.add(XSD_GDAY);
+        tempTypes.add(XSD_GMONTH);
+        tempTypes.add(XSD_GMONTHDAY);
+        tempTypes.add(XSD_GYEAR);
+        tempTypes.add(XSD_GYEARMONTH);
+        tempTypes.add(XSD_HEXBINARY);
+        tempTypes.add(XSD_INT);
+        tempTypes.add(XSD_INTEGER);
+        tempTypes.add(XSD_LANGUAGE);
+        tempTypes.add(XSD_LONG);
+        tempTypes.add(XSD_NAME);
+        tempTypes.add(XSD_NCNAME);
+        tempTypes.add(XSD_NEGATIVEINTEGER);
+        tempTypes.add(XSD_NMTOKEN);
+        tempTypes.add(XSD_NONNEGATIVEINTEGER);
+        tempTypes.add(XSD_NONPOSITIVEINTEGER);
+        tempTypes.add(XSD_NORMALIZEDSTRING);
+        tempTypes.add(XSD_POSITIVEINTEGER);
+        tempTypes.add(XSD_SHORT);
+        tempTypes.add(XSD_STRING);
+        tempTypes.add(XSD_TIME);
+        tempTypes.add(XSD_TOKEN);
+        tempTypes.add(XSD_UNSIGNEDBYTE);
+        tempTypes.add(XSD_UNSIGNEDINT);
+        tempTypes.add(XSD_UNSIGNEDLONG);
+        tempTypes.add(XSD_UNSIGNEDSHORT);
+        ALL_TYPES = Collections.unmodifiableSet(tempTypes);
+    }
+
+    private final IRI field;
+
+    private Types(String field) {
+        this.field = new IRIImpl(field);
+    }
+
+    @Override
+    public String getIRIString() {
+        return this.field.getIRIString();
+    }
+
+    @Override
+    public String ntriplesString() {
+        return this.field.ntriplesString();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        return this.field.equals(other);
+    }
+
+    @Override
+    public int hashCode() {
+        return this.field.hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return this.field.toString();
+    }
+
+    /**
+     * Get an immutable set of the IRIs used by the RDF-1.1 specification to
+     * define types, from the RDF and XML Schema vocabularies.
+     *
+     * @return A {@link Set} containing all of the IRIs in this collection.
+     */
+    public static Set<IRI> values() {
+        return ALL_TYPES;
+    }
+
+    /**
+     * Get the IRI from this collection if it is present, or return
+     * {@link Optional#empty()} otherwise.
+     *
+     * @param nextIRI The IRI to look for.
+     * @return An {@link Optional} containing the IRI from this collection or
+     * {@link Optional#empty()} if it is not present here.
+     */
+    public static Optional<IRI> get(IRI nextIRI) {
+        if (ALL_TYPES.contains(nextIRI)) {
+            // If we know about this IRI, then look through our set to find the
+            // object that matches and return it
+            for (IRI nextType : ALL_TYPES) {
+                if (nextType.equals(nextIRI)) {
+                    return Optional.of(nextType);
+                }
+            }
+        }
+        return Optional.empty();
+    }
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/main/java/org/apache/commons/rdf/simple/package-info.java
----------------------------------------------------------------------
diff --git 
a/simple/src/main/java/org/apache/commons/rdf/simple/package-info.java 
b/simple/src/main/java/org/apache/commons/rdf/simple/package-info.java
index a806fe0..67ac732 100644
--- a/simple/src/main/java/org/apache/commons/rdf/simple/package-info.java
+++ b/simple/src/main/java/org/apache/commons/rdf/simple/package-info.java
@@ -29,7 +29,7 @@
  * To use this implementation, create an instance of {@link 
SimpleRDFTermFactory}
  * and use methods like {@link SimpleRDFTermFactory#createGraph} and 
  * {@link SimpleRDFTermFactory#createIRI(String)}.
- * 
+ *
  */
 package org.apache.commons.rdf.simple;
 

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/BlankNodeImplTest.java
----------------------------------------------------------------------
diff --git 
a/simple/src/test/java/org/apache/commons/rdf/simple/BlankNodeImplTest.java 
b/simple/src/test/java/org/apache/commons/rdf/simple/BlankNodeImplTest.java
index 1c9c2a2..aa4c868 100644
--- a/simple/src/test/java/org/apache/commons/rdf/simple/BlankNodeImplTest.java
+++ b/simple/src/test/java/org/apache/commons/rdf/simple/BlankNodeImplTest.java
@@ -17,25 +17,24 @@
  */
 package org.apache.commons.rdf.simple;
 
-import java.util.Optional;
-
 import org.apache.commons.rdf.api.AbstractBlankNodeTest;
 import org.apache.commons.rdf.api.BlankNode;
 
+import java.util.Optional;
+
 /**
  * Concrete implementation of BlankNodeImpl test.
- *
  */
 public class BlankNodeImplTest extends AbstractBlankNodeTest {
 
-       @Override
-       protected BlankNode getBlankNode() {
-               return new BlankNodeImpl();
-       }
+    @Override
+    protected BlankNode getBlankNode() {
+        return new BlankNodeImpl();
+    }
 
-       @Override
-       protected BlankNode getBlankNode(String identifier) {
-               return new BlankNodeImpl(Optional.empty(), identifier);
-       }
+    @Override
+    protected BlankNode getBlankNode(String identifier) {
+        return new BlankNodeImpl(Optional.empty(), identifier);
+    }
 
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/DefaultGraphTest.java
----------------------------------------------------------------------
diff --git 
a/simple/src/test/java/org/apache/commons/rdf/simple/DefaultGraphTest.java 
b/simple/src/test/java/org/apache/commons/rdf/simple/DefaultGraphTest.java
index 5cfcda6..57fec35 100644
--- a/simple/src/test/java/org/apache/commons/rdf/simple/DefaultGraphTest.java
+++ b/simple/src/test/java/org/apache/commons/rdf/simple/DefaultGraphTest.java
@@ -25,28 +25,27 @@ import org.apache.commons.rdf.api.RDFTermFactory;
 /**
  * Ensure AbstractGraphTest does not crash if the RDFTermFactory throws
  * UnsupportedOperationException
- *
  */
 
 public class DefaultGraphTest extends AbstractGraphTest {
 
-       @Override
-       public RDFTermFactory createFactory() {
-               // The most minimal RDFTermFactory that would still
-               // make sense with a Graph
-               return new RDFTermFactory() {
-                       @Override
-                       public Graph createGraph() throws 
UnsupportedOperationException {
-                               return new GraphImpl(new 
SimpleRDFTermFactory());
-                       }
+    @Override
+    public RDFTermFactory createFactory() {
+        // The most minimal RDFTermFactory that would still
+        // make sense with a Graph
+        return new RDFTermFactory() {
+            @Override
+            public Graph createGraph() throws UnsupportedOperationException {
+                return new GraphImpl(new SimpleRDFTermFactory());
+            }
 
-                       @Override
-                       public IRI createIRI(String iri)
-                                       throws UnsupportedOperationException,
-                                       IllegalArgumentException {
-                               return new IRIImpl(iri);
-                       }
-               };
-       }
+            @Override
+            public IRI createIRI(String iri)
+                    throws UnsupportedOperationException,
+                    IllegalArgumentException {
+                return new IRIImpl(iri);
+            }
+        };
+    }
 
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/SimpleGraphTest.java
----------------------------------------------------------------------
diff --git 
a/simple/src/test/java/org/apache/commons/rdf/simple/SimpleGraphTest.java 
b/simple/src/test/java/org/apache/commons/rdf/simple/SimpleGraphTest.java
index 350a307..0951942 100644
--- a/simple/src/test/java/org/apache/commons/rdf/simple/SimpleGraphTest.java
+++ b/simple/src/test/java/org/apache/commons/rdf/simple/SimpleGraphTest.java
@@ -22,13 +22,12 @@ import org.apache.commons.rdf.api.RDFTermFactory;
 
 /**
  * Test SimpleRDFTermFactory with AbstractGraphTest
- *
  */
 public class SimpleGraphTest extends AbstractGraphTest {
 
-       @Override
-       public RDFTermFactory createFactory() {
-               return new SimpleRDFTermFactory();
-       }
+    @Override
+    public RDFTermFactory createFactory() {
+        return new SimpleRDFTermFactory();
+    }
 
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/SimpleNoRelativeIRIRDFTermFactoryTest.java
----------------------------------------------------------------------
diff --git 
a/simple/src/test/java/org/apache/commons/rdf/simple/SimpleNoRelativeIRIRDFTermFactoryTest.java
 
b/simple/src/test/java/org/apache/commons/rdf/simple/SimpleNoRelativeIRIRDFTermFactoryTest.java
index 6426f1c..2431ecf 100644
--- 
a/simple/src/test/java/org/apache/commons/rdf/simple/SimpleNoRelativeIRIRDFTermFactoryTest.java
+++ 
b/simple/src/test/java/org/apache/commons/rdf/simple/SimpleNoRelativeIRIRDFTermFactoryTest.java
@@ -17,32 +17,31 @@
  */
 package org.apache.commons.rdf.simple;
 
-import java.net.URI;
-
 import org.apache.commons.rdf.api.AbstractRDFTermFactoryTest;
 import org.apache.commons.rdf.api.IRI;
 import org.apache.commons.rdf.api.RDFTermFactory;
 
+import java.net.URI;
+
 /**
  * Test simple IRI without relative IRI support.
  * <p?>
  * Ensures that {@link AbstractRDFTermFactoryTest#createIRIRelative()} is
  * correctly skipped (without causing an error.
- *
  */
 public class SimpleNoRelativeIRIRDFTermFactoryTest extends
-               AbstractRDFTermFactoryTest {
-       @Override
-       public RDFTermFactory createFactory() {
-               return new SimpleRDFTermFactory() {
-                       @Override
-                       public IRI createIRI(String iri) {
-                               if (!URI.create(iri).isAbsolute()) {
-                                       throw new 
IllegalArgumentException("IRIs must be absolute");
-                                       // ..in this subclass for testing 
purposes only :)
-                               }
-                               return super.createIRI(iri);
-                       }
-               };
-       }
+        AbstractRDFTermFactoryTest {
+    @Override
+    public RDFTermFactory createFactory() {
+        return new SimpleRDFTermFactory() {
+            @Override
+            public IRI createIRI(String iri) {
+                if (!URI.create(iri).isAbsolute()) {
+                    throw new IllegalArgumentException("IRIs must be 
absolute");
+                    // ..in this subclass for testing purposes only :)
+                }
+                return super.createIRI(iri);
+            }
+        };
+    }
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/SimpleRDFTermFactoryTest.java
----------------------------------------------------------------------
diff --git 
a/simple/src/test/java/org/apache/commons/rdf/simple/SimpleRDFTermFactoryTest.java
 
b/simple/src/test/java/org/apache/commons/rdf/simple/SimpleRDFTermFactoryTest.java
index fbc368f..9ef2a35 100644
--- 
a/simple/src/test/java/org/apache/commons/rdf/simple/SimpleRDFTermFactoryTest.java
+++ 
b/simple/src/test/java/org/apache/commons/rdf/simple/SimpleRDFTermFactoryTest.java
@@ -22,13 +22,12 @@ import org.apache.commons.rdf.api.RDFTermFactory;
 
 /**
  * Simple RDFTermFactory Test
- *
  */
 public class SimpleRDFTermFactoryTest extends AbstractRDFTermFactoryTest {
 
-       @Override
-       public RDFTermFactory createFactory() {
-               return new SimpleRDFTermFactory();
-       }
+    @Override
+    public RDFTermFactory createFactory() {
+        return new SimpleRDFTermFactory();
+    }
 
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/TestWritingGraph.java
----------------------------------------------------------------------
diff --git 
a/simple/src/test/java/org/apache/commons/rdf/simple/TestWritingGraph.java 
b/simple/src/test/java/org/apache/commons/rdf/simple/TestWritingGraph.java
index 9b7a925..7c09d62 100644
--- a/simple/src/test/java/org/apache/commons/rdf/simple/TestWritingGraph.java
+++ b/simple/src/test/java/org/apache/commons/rdf/simple/TestWritingGraph.java
@@ -17,7 +17,12 @@
  */
 package org.apache.commons.rdf.simple;
 
-import static org.junit.Assert.*;
+import org.apache.commons.rdf.api.Graph;
+import org.apache.commons.rdf.api.IRI;
+import org.apache.commons.rdf.api.RDFTermFactory;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.nio.charset.Charset;
 import java.nio.file.Files;
@@ -27,129 +32,125 @@ import java.util.Collections;
 import java.util.List;
 import java.util.stream.Stream;
 
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
-import org.apache.commons.rdf.api.Graph;
-import org.apache.commons.rdf.api.IRI;
-import org.apache.commons.rdf.api.RDFTermFactory;
+import static org.junit.Assert.assertEquals;
 
 /**
  * Test writting graph
- *
  */
 public class TestWritingGraph {
 
-       /*
-        * 200k triples should do - about 7 MB on disk. Override with
-        * -Dtriples=20000000 to exercise your memory banks.
-        */
-       private static final long TRIPLES = Long.getLong("triples", 200000L);
-
-       /** Run tests with -Dkeepfiles=true to inspect /tmp files **/
-       private static boolean KEEP_FILES = Boolean.getBoolean("keepfiles");
-
-       private static Graph graph;
-
-       private static RDFTermFactory factory;
-
-       @BeforeClass
-       public static void createGraph() throws Exception {
-               factory = new SimpleRDFTermFactory();
-               graph = factory.createGraph();
-               IRI subject = factory.createIRI("subj");
-               IRI predicate = factory.createIRI("pred");
-               List<IRI> types = new ArrayList<>(Types.values());
-               // Ensure we don't try to create a literal with rdf:langString 
but
-               // without a language tag
-               types.remove(Types.RDF_LANGSTRING);
-               Collections.shuffle(types);
-               for (int i = 0; i < TRIPLES; i++) {
-                       if (i % 11 == 0) {
-                               graph.add(subject, predicate,
-                                               
factory.createBlankNode("Example " + i));
-                       } else if (i % 5 == 0) {
-                               graph.add(subject, predicate,
-                                               factory.createLiteral("Example 
" + i, "en"));
-                       } else if (i % 3 == 0) {
-                               graph.add(
-                                               subject,
-                                               predicate,
-                                               factory.createLiteral("Example 
" + i,
-                                                               types.get(i % 
types.size())));
-                       } else {
-                               graph.add(subject, predicate,
-                                               factory.createLiteral("Example 
" + i));
-                       }
-               }
-       }
-
-       @AfterClass
-       public static void tearDownClass() throws Exception {
-               graph.clear();
-               graph = null;
-       }
-
-       @Test
-       public void createGraphTiming() throws Exception {
-               createGraph();
-       }
-
-       @Test
-       public void countQuery() {
-               IRI subject = factory.createIRI("subj");
-               IRI predicate = factory.createIRI("pred");
-               long count = graph.getTriples(subject, predicate, 
null).unordered()
-                               .parallel().count();
-               System.out.println("Counted - " + count);
-               assertEquals(count, TRIPLES);
-       }
-
-       @Test
-       public void writeGraphFromStream() throws Exception {
-               Path graphFile = Files.createTempFile("graph", ".nt");
-               if (KEEP_FILES) {
-                       System.out.println("From stream: " + graphFile);
-               } else {
-                       graphFile.toFile().deleteOnExit();
-               }
-
-               Stream<CharSequence> stream = 
graph.getTriples().map(Object::toString);
-               Files.write(graphFile, stream::iterator, 
Charset.forName("UTF-8"));
-       }
-
-       @Test
-       public void writeGraphFromStreamFiltered() throws Exception {
-               Path graphFile = Files.createTempFile("graph", ".nt");
-               if (KEEP_FILES) {
-                       System.out.println("Filtered stream: " + graphFile);
-               } else {
-                       graphFile.toFile().deleteOnExit();
-               }
-
-               IRI subject = factory.createIRI("subj");
-               IRI predicate = factory.createIRI("pred");
-               Stream<CharSequence> stream = graph
-                               .getTriples(subject, predicate, 
null).map(Object::toString);
-               Files.write(graphFile, stream::iterator, 
Charset.forName("UTF-8"));
-
-       }
-
-       @Test
-       public void writeGraphFromStreamFilteredNoMatches() throws Exception {
-               Path graphFile = Files.createTempFile("graph-empty-", ".nt");
-               if (KEEP_FILES) {
-                       System.out.println("Filtered stream: " + graphFile);
-               } else {
-                       graphFile.toFile().deleteOnExit();
-               }
-
-               IRI subject = factory.createIRI("nonexistent");
-               IRI predicate = factory.createIRI("pred");
-               Stream<CharSequence> stream = graph
-                               .getTriples(subject, predicate, 
null).map(Object::toString);
-               Files.write(graphFile, stream::iterator, 
Charset.forName("UTF-8"));
-
-       }
+    /*
+     * 200k triples should do - about 7 MB on disk. Override with
+     * -Dtriples=20000000 to exercise your memory banks.
+     */
+    private static final long TRIPLES = Long.getLong("triples", 200000L);
+
+    /**
+     * Run tests with -Dkeepfiles=true to inspect /tmp files *
+     */
+    private static boolean KEEP_FILES = Boolean.getBoolean("keepfiles");
+
+    private static Graph graph;
+
+    private static RDFTermFactory factory;
+
+    @BeforeClass
+    public static void createGraph() throws Exception {
+        factory = new SimpleRDFTermFactory();
+        graph = factory.createGraph();
+        IRI subject = factory.createIRI("subj");
+        IRI predicate = factory.createIRI("pred");
+        List<IRI> types = new ArrayList<>(Types.values());
+        // Ensure we don't try to create a literal with rdf:langString but
+        // without a language tag
+        types.remove(Types.RDF_LANGSTRING);
+        Collections.shuffle(types);
+        for (int i = 0; i < TRIPLES; i++) {
+            if (i % 11 == 0) {
+                graph.add(subject, predicate,
+                        factory.createBlankNode("Example " + i));
+            } else if (i % 5 == 0) {
+                graph.add(subject, predicate,
+                        factory.createLiteral("Example " + i, "en"));
+            } else if (i % 3 == 0) {
+                graph.add(
+                        subject,
+                        predicate,
+                        factory.createLiteral("Example " + i,
+                                types.get(i % types.size())));
+            } else {
+                graph.add(subject, predicate,
+                        factory.createLiteral("Example " + i));
+            }
+        }
+    }
+
+    @AfterClass
+    public static void tearDownClass() throws Exception {
+        graph.clear();
+        graph = null;
+    }
+
+    @Test
+    public void createGraphTiming() throws Exception {
+        createGraph();
+    }
+
+    @Test
+    public void countQuery() {
+        IRI subject = factory.createIRI("subj");
+        IRI predicate = factory.createIRI("pred");
+        long count = graph.getTriples(subject, predicate, null).unordered()
+                .parallel().count();
+        System.out.println("Counted - " + count);
+        assertEquals(count, TRIPLES);
+    }
+
+    @Test
+    public void writeGraphFromStream() throws Exception {
+        Path graphFile = Files.createTempFile("graph", ".nt");
+        if (KEEP_FILES) {
+            System.out.println("From stream: " + graphFile);
+        } else {
+            graphFile.toFile().deleteOnExit();
+        }
+
+        Stream<CharSequence> stream = graph.getTriples().map(Object::toString);
+        Files.write(graphFile, stream::iterator, Charset.forName("UTF-8"));
+    }
+
+    @Test
+    public void writeGraphFromStreamFiltered() throws Exception {
+        Path graphFile = Files.createTempFile("graph", ".nt");
+        if (KEEP_FILES) {
+            System.out.println("Filtered stream: " + graphFile);
+        } else {
+            graphFile.toFile().deleteOnExit();
+        }
+
+        IRI subject = factory.createIRI("subj");
+        IRI predicate = factory.createIRI("pred");
+        Stream<CharSequence> stream = graph
+                .getTriples(subject, predicate, null).map(Object::toString);
+        Files.write(graphFile, stream::iterator, Charset.forName("UTF-8"));
+
+    }
+
+    @Test
+    public void writeGraphFromStreamFilteredNoMatches() throws Exception {
+        Path graphFile = Files.createTempFile("graph-empty-", ".nt");
+        if (KEEP_FILES) {
+            System.out.println("Filtered stream: " + graphFile);
+        } else {
+            graphFile.toFile().deleteOnExit();
+        }
+
+        IRI subject = factory.createIRI("nonexistent");
+        IRI predicate = factory.createIRI("pred");
+        Stream<CharSequence> stream = graph
+                .getTriples(subject, predicate, null).map(Object::toString);
+        Files.write(graphFile, stream::iterator, Charset.forName("UTF-8"));
+
+    }
 
 }

http://git-wip-us.apache.org/repos/asf/incubator-commonsrdf/blob/5ee4c293/simple/src/test/java/org/apache/commons/rdf/simple/TypesTest.java
----------------------------------------------------------------------
diff --git a/simple/src/test/java/org/apache/commons/rdf/simple/TypesTest.java 
b/simple/src/test/java/org/apache/commons/rdf/simple/TypesTest.java
index 65e1f52..02c841d 100644
--- a/simple/src/test/java/org/apache/commons/rdf/simple/TypesTest.java
+++ b/simple/src/test/java/org/apache/commons/rdf/simple/TypesTest.java
@@ -17,54 +17,53 @@
  */
 package org.apache.commons.rdf.simple;
 
-import static org.junit.Assert.*;
-
 import org.junit.Test;
 
+import static org.junit.Assert.*;
+
 /**
  * Tests for the {@link Types} enumeration.
- *
  */
 public class TypesTest {
 
-       /**
-        * Test method for {@link Types#getIRIString()}
-        * .
-        */
-       @Test
-       public final void testGetIRIString() {
-               
assertEquals("http://www.w3.org/1999/02/22-rdf-syntax-ns#langString";,
-                               Types.RDF_LANGSTRING.getIRIString());
-       }
+    /**
+     * Test method for {@link Types#getIRIString()}
+     * .
+     */
+    @Test
+    public final void testGetIRIString() {
+        assertEquals("http://www.w3.org/1999/02/22-rdf-syntax-ns#langString";,
+                Types.RDF_LANGSTRING.getIRIString());
+    }
 
-       /**
-        * Test method for
-        * {@link Types#ntriplesString()}.
-        */
-       @Test
-       public final void testNtriplesString() {
-               
assertEquals("<http://www.w3.org/1999/02/22-rdf-syntax-ns#langString>",
-                               Types.RDF_LANGSTRING.ntriplesString());
-       }
+    /**
+     * Test method for
+     * {@link Types#ntriplesString()}.
+     */
+    @Test
+    public final void testNtriplesString() {
+        assertEquals("<http://www.w3.org/1999/02/22-rdf-syntax-ns#langString>",
+                Types.RDF_LANGSTRING.ntriplesString());
+    }
 
-       /**
-        * Test method for
-        * {@link Types#get(org.apache.commons.rdf.api.IRI)}
-        * .
-        */
-       @Test
-       public final void testGet() {
-               assertTrue(Types.get(
-                               new 
IRIImpl("http://www.w3.org/2001/XMLSchema#boolean";))
-                               .isPresent());
-               assertEquals(
-                               "http://www.w3.org/2001/XMLSchema#boolean";,
-                               Types.get(
-                                               new 
IRIImpl("http://www.w3.org/2001/XMLSchema#boolean";))
-                                               .get().getIRIString());
-               assertFalse(Types.get(
-                               new 
IRIImpl("http://www.w3.org/2001/XMLSchema#nonExistent";))
-                               .isPresent());
-       }
+    /**
+     * Test method for
+     * {@link Types#get(org.apache.commons.rdf.api.IRI)}
+     * .
+     */
+    @Test
+    public final void testGet() {
+        assertTrue(Types.get(
+                new IRIImpl("http://www.w3.org/2001/XMLSchema#boolean";))
+                .isPresent());
+        assertEquals(
+                "http://www.w3.org/2001/XMLSchema#boolean";,
+                Types.get(
+                        new 
IRIImpl("http://www.w3.org/2001/XMLSchema#boolean";))
+                        .get().getIRIString());
+        assertFalse(Types.get(
+                new IRIImpl("http://www.w3.org/2001/XMLSchema#nonExistent";))
+                .isPresent());
+    }
 
 }

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