How to Build a Glossary from Business Process Model?

Sometimes, when one tries to comprehend a business or a system by studying the related business process models, he/she may have trouble understanding part(s) of the model because some of the element names or documentations are not very clear. This is usually not a language skill issue, but rather one about not knowing the meaning of certain words or phrases specific to the system domain. For example, if you read a BPMN lane called Customer, would you know whether it means someone who has been paid (e.g. a refund), or someone who is required to pay, or just someone who might purchase something but possibly end up not buying in the end? Incorrect interpretation may lead to misunderstanding and developing a system that does not meet customer expectations. In order to ensure readers can fully understand a model, it would be useful to prepare some sort of glossary to collect and define key terms or key phrases in models.