code: @Nonnull
    public static DocumentBuilderFactory createDocumentBuilderFactory (@Nonnull final Schema aSchema)
    {
      ValueEnforcer.notNull (aSchema, "Schema");
  
      final DocumentBuilderFactory aDocumentBuilderFactory = createDefaultDocumentBuilderFactory ();
      aDocumentBuilderFactory.setSchema (aSchema);
      return aDocumentBuilderFactory;
    }
docs: Create a new {@link DocumentBuilderFactory} for the specified schema, with
  the following settings: coalescing, comment ignoring and namespace aware.
  
  @param aSchema
  The schema to use. May not be <code>null</code>.
  @return Never <code>null</code>.