Title

Disambiguate notational convention for choice syntax

Description

Framework and Attachment, section 2.1 each, state:

The character "|" is used to indicate a choice between alternatives.

The character is used exactly twice. The first occurrence is in the framework, section 4.2:

/wsp:Policy/(@wsu:Id | @xml:id)

The other occurrence is in attachment, section 3.4:

(05)   ( <wsp:Policy> </wsp:Policy> |
(06)     <wsp:PolicyReference> </wsp:PolicyReference> ) +

In both cases, the choice is exclusive. Note the + character which allows multiple occurrences of Policy and PolicyReference in the second case. Inclusive choice can always be solved as in the second case.
Justification

We should define the | syntax as exclusive right from the beginning to ease reading and understanding.

Target

Framework and Attachment

Proposal

In Framework section 2.1 and Attachment section 2.1 replace this:

The character "|" is used to indicate a choice between alternatives.

with this:

The character "|" is used to indicate an exclusive choice between alternatives.