Berny,
I'd choose one unit of measurement to be stored in the XML document. Then you can use XSL to provide different displays of the length.
>Could anybody give me some idea as to the best way to represent 'lengths' in XML files.
>
>I have a requirement to output units of lengths in both metric and imperial, ie millimeters and feet inches and fraction of inches.
>
>Has anybody got any pointers as to the various methods of achieving this?