How to use EXIF items not below 'Camera' and 'Image'

[Robinhood]

Hello. I want to insert some EXIF infomation to my webpage generated by XnView. The EXIF infomation of my photo looks like this:
[Camera]
Make : Canon
......
[Image]
F-Number : F2.5
......
[Makernotes]
ISO value : 50
......
I can user tag <Make> and <F-Number> to get the item content. But tag <ISO value> doesn't work. Actually the items which are not below [Camera] and [Image] cann't be refered to. How could I use them?
Thanks a lot.

[xnview]

Hello. I want to insert some EXIF infomation to my webpage generated by XnView. The EXIF infomation of my photo looks like this:
[Camera]
Make : Canon
......
[Image]
F-Number : F2.5
......
[Makernotes]
ISO value : 50
......
I can user tag <Make> and <F-Number> to get the item content. But tag <ISO value> doesn't work. Actually the items which are not below [Camera] and [Image] cann't be refered to. How could I use them?
Thanks a lot.

<ISO value> is from Image IFD, not Makernotes. Currently, you can not extract field from Makernotes.
Pierre.