On Sat, 06 January 2001, deen@slt.lk wrote:

Is a separate AS Number required for an Internet Xchange point network.

No, nor does an exchange point network need to be announced outside the exchange point. If the exchange point network is announced, it will be associated with one or more ASNs. Some exchange points have a separate AS number, other exchange point networks are announced within the ASN or ASNs of its members, and finally some exchange point networks are not announced outside the exchange point.