Same method a {@link #addResourceURI(String)}
@param urn string representing the resource; e.g., 'urn:miriam:kegg.reaction:R00351'
@return {@code true} as specified in {@link Collection#add(Object)}
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.