Potential issues

While creating an inlined proposal for issue 52, I noticed the following 
that I think are bugs:

1) partnerLinkType and partnerRole attributes of sca-bpel:multiReference 
are listed as optional in the appendix schema but the pseudo-schema 
lists them as required. I think they should be required. Is that correct?

2) Nowhere does the spec say that a variable must not have both 
sca-bpel:property='yes' and sca-bpel:multReference. Any reason to allow 
both? And if yes, what is the usecase?

3) Why is sca-bpel:property a tBoolean? When would anyone every use it 
with value of "no" ?

-Anish
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