XML-efficiency

[szaghi]

This is not properly a bug. There is an inefficiency when saving XML raw (binary) file. To write raw data into XML file the library uses a temporary scratch file to save binary data while saving all formatting data to the final XML file. Only when all XML formatting data have been written the scratch file is rewind and the binary data is saved in the final tag of XML file as raw appended data. This approach is not efficient.