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Subject: NEW ISSUE: Title: Use of SchemaTron to formalize usage constraints
TARGET: SCA C+I WS-BPEL spec, General DESCRIPTION: There are several places in the document where we make statements limiting the usage of our defined XML items. An example from Section 3.3, where sca-bpel:service and sca-bpel:reference are defined: "A process MUST NOT include both attributes on a single partnerLink." This kind of restriction can not be encoded in XML Schema intuitively, so we don't. Furthermore, there is an implicit restriction that these attributes are only to be used on a partnerLink, but again, we don't state that formally. PROPOSAL: Define SchemaTron rules in our specification that formalize the constraints that are now limited to either informal verbal constraints, or implied constraints.
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