FoProperty FoProperty is wonderful FoProperty is really wonderful. @Returns: @FO_PROPERTY_ERROR_FAILED: @FO_PROPERTY_ERROR_EXPRESSION: @FO_PROPERTY_ERROR_NO_ENUMERATION: @FO_PROPERTY_ERROR_ILLEGAL_NEGATIVE: @FO_PROPERTY_ERROR_ZERO_LENGTH: @FO_PROPERTY_ERROR_LAST: @Returns: @property: @Returns: @property: @new_value: @property_class: @Returns: @property: @Returns: @property_class: @Returns: @property: @Returns: @token: @context: @err: @Returns: @percentage: @font_size: @fo_node: @context: @err: @Returns: @property_class: @expr: @context: @current_font_size: @fo_node: @error: @Returns: