Incorrect uses of RFC 2119 'MAY' in SBPEL3017

Title: Incorrect uses of RFC 2119 'MAY' in SBPEL3017

Title: Incorrect uses of RFC 2119 'MAY' in SBPEL3017

Target: SCA BPEL spec

Description: 

The RFC 2119 guideline for using the word 'MAY' is:

This word, or the adjective "OPTIONAL", mean that an item is

truly optional.  One vendor may choose to include the item because a

particular marketplace requires it or because the vendor feels that

it enhances the product while another vendor may omit the same item.

SBPEL3017 reads as: To explicitly map a partner link to a reference, the sca-bpel:reference attribute MAY be specified for the partner link.  

The word 'MAY' in this statement is intended to point out a feature that is available for users of the products implementing the specification and is not intended to point out the optionality from a vendor implementation point of view.

Proposal:

Change SBPEL3017 to read as:

To explicitly map a partner link to a reference, the sca-bpel:reference attribute is specified for the partner link.