Which version for BPMN Appian use?
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The graphical notation of Appian is complaint with BPMN 2.0 but the xml that Appian uses internally does not follow BPMN 2.0 completely. There are also some nodes defined by BPMN 2.0 that are not available in Appian. You can see the full BPMN 2.0 description here
In another discussion Malcolm Ross, deputy CTO from Appian, explain it. It is not possible to import/export BPMN 2.0 models from other BPMN 2.0 platforms directly into / from Appian.
jesusa310 Can I import any workflow from Visio to Appian
Please see this post:
community.appian.com/.../is-it-possible-to-import-or-export-processes-from-another-format-for
It is not possible without adjustments. In the post that I mentioned on my previous comment Malcolm Ross explains the difficulties: "To create an export from another XML format to Appian, you will need to create an XML transformation (XSLT) to migrate the objects. Appian performed this once with Mega, allowing processes from Mega to be imported to Appian and vice versa using this technique. Appian has not provided a XPDL or other format importer/exporter due to a general lack of demand."
I also tested some imports / exports between different BPM platforms and there were problems everywhere. The graphical representation of the BPMN notation might be standard but it seems that most of the vendors include modifications internally.