private String vertexPropertyId(final URI s,final URI p,final Literal o){
  return String.format(VERTEX_PROPERTY_ID,s.toString(),p.toString(),o.toString());
}

private String vertexPropertyId ( final URI s , final URI p , final Literal o ) { return String . format ( VERTEX_PROPERTY_ID , s . toString ( ) , p . toString ( ) , o . toString ( ) ) ; }
construct a blazevertexproperty id .
