code: protected final Path pathFrom( Path parentPath,
                                     String childPath ) {
          Path parent = pathFactory().create(parentPath);
          return pathFactory().create(parent, childPath);
      }
docs: Helper method that creates a {@link Path} object from a parent path and a child path string. This is equivalent to calling
  " <code>pathFactory().create(parentPath,childPath)</code>", and is simply provided for convenience.
  
  @param parentPath the parent path
  @param childPath the child path as a string
  @return the value, or null if the supplied string is null
  @throws ValueFormatException if the conversion from a string could not be performed
  @see PathFactory#create(String)
  @see #pathFrom(String)