char * vortex_frame_get_error_message ( const char *  code,
const char *  error_content,
const char *  xml_lang 

Creates and return the error message.

Allows to create a new error message that should be unrefered when no longer is needed.

code The error code to report.
error_content The error content, actually the textual error diagnostic.
xml_lang The language used to define the diagnostic message.
A newly allocated error message.