http://www.cisco.com/en/US/products/...d800c1136.html
configured, a site-local address uses a specific prefix (FEC0::/10) and concatenates the
.

Comparing with this
Code:
www.docs.hp.com/en/B3936-90073/apis01.html
Why does he mention FEC0 with prefix-length 10 ? shouldn't he have said a site-local address uses a specific prefix FEC0::/16 (instead of 10) ?