in the routine gxml_write_gifti, in gifti_xml.c, in this code:

if(gim->version){ fprintf(fp," Version=\"%s\"", gim->version); first = 0; }
fprintf(fp,"%sNumberOfDataArrays=\"%d\"", first ? "" : " ", gim->numDA);

if gim->version is empty (null), then the GIFTI type field will look like this:



that is, a space is missing after GIFTI, making gifti_test choke on this file.

so either an extra space is necessary, like this:

"%s NumberOfDa....

or maybe the routine should error exit if the version is missing (which is a better idea i think).

That space is added. The compliance checks are in gifti_valid_gifti_image(), where I plan to add more.