BPML, a superset of BPEL, was implemented by early stage vendors, such as Intalio Inc., but incumbents such as IBM and Microsoft did not implement BPML in their existing workflow and integration engine implementations like BizTalk or Websphere.
BPML, an extension of BPEL, was adopted by early-stage vendors but not embraced by established players such as IBM and Microsoft who already had integrated workflow and integration engines like BizTalk or Websphere.