Add support for Abstract Processes

[GoogleCodeExporter]

<cut from BPELspec>
NOTE: Here is the changes path from Exec BPEL XSD to this XSD:
  (a) have a global replace from minOccurs=1 to minOccurs=0 for element
declaration
  (b) have a global replace from use=required to use=optional for attribute
declaration
  (c) change "xsd-derived" from XSD NS to this Abstract BPEL NS and define
the corresponding simple types
  (d) adding "##opaque" to BPELVariableName, tInitiate, tPattern, tRoles,
tBoolean
  (e) add abstractProcessProfile to tProcess
  (f) add opaqueActivity
  (g) add tOpaqueBoolean type and add opaque attribute tExpression, tQuery,
tFrom, tTo
  (h) add opaqueFrom element and introduce fromGroup
  (i) Change the sequence for "tOnAlarmEvent"

http://docs.oasis-open.org/wsbpel/2.0/OS/process/abstract/ws-bpel_abstract_commo
n_base.xsd

Original issue reported on code.google.com by mc.bisc...@googlemail.com on 5 Dec 2008 at 9:55