String (final Namespace namespace, final Namespace other) { String p1, p2, u1, u2, reason; reason = null; p1 = namespace.getPrefix(); u1 = namespace.getURI(); p2 = other.getPrefix(); u2 = other.getURI(); if (p1.equals(p2) && !u1.equals(u2)) { reason = "The namespace prefix \"" + p1 + "\" collides"; } return reason; }