请教问题：XML parse error，怎么解决

曾经未必

Running D:/software/Madymo_621\win32p\bin\bsaf.exe "E:/madymo/template20091020.xml" "template20091020.saf"
Opening file 'E:/madymo/template20091020.xml'
Opening file 'D:/software/Madymo_621/share/etc/mtd_3d.dtd'
Opening file 'D:/software/Madymo_621/share/etc/mtd_3d_type.txt'
Opening file 'D:/software/Madymo_621/share/etc/mtd_3d_range.txt'
Opening file 'D:/software/Madymo_621\share\etc\typedefs.xml'
Opening file 'D:/software/Madymo_621\share\etc\mtd_3d.dtd'
XML parse error:
file=E:/madymo/template20091020.xml line=30 column=21
This type of attribute cannot have an empty value

**   ABORT ** ID=(INPI41/3D/CMDL3D)         
Failed to parse the XML input file. Use the MADYMO Reference manual to
assist with correction of the errors in the input deck.

MADYMO TERMINATED ABNORMALLY, because of ERRORS.
Stopped Tue Oct 20 19:18:55 2009

MADYMO

file=E:/madymo/template20091020.xml line=30 column=21
This type of attribute cannot have an empty value

错误信息已经说得很清楚了，用UltraEdit打开 template20091020.xml文件，检查第30行(line=30)、21列 (column=21)，此attribute不能为空 (empty)

曾经未必

多谢！问题已解决，以后还请多指教