XSLT Mapping for grouping and generate multiple files

Hi

Could you please provide xslt code to generate below target structure.

Source:

MT_1

Record 1..unbound

Name  0..1

Hair_Colour  0..1

Address 0..1

      Street  0..1

      D.No 0..1

Target:

Target structure is same as source structure. Need to create multiple files by grouping all people based on their hair color.

for example single message with all the people who has white hair and one more message for black hair people somthing like that.

Thanks,

Krish