The XSD-scheme is in the source codes. Latest version that should be identic to ISO 25178-72 standard can be found here: https://sourceforge.net/p/open-gps/code/HEAD/tree/ISO5436_XML/branches/Kohler_LinuxPort/src/ISO5436_2_XML/iso5436_2.xsd
Please see updated text at the beginning of the article.
Porting_Guide
I will have a look for it. Georg
Fixed syntax error.
Added optassyst website.
Added small openGPS logo
Added optassyst logo