About element templates
Element templates are currently available in BPMN diagrams only.
Element templates are a way to extend the modeler with domain-specific diagram elements, such as service and user tasks.
Applicable element templates can be assigned to a BPMN element via the properties panel and/or the replace menu.
Applying an element template configures the diagram element with pre-defined values for BPMN properties, input/output mappings, and extension properties.
As seen in the Mail Task example above, it also provides custom editing UI, input validation, and assistance.
Creating and editing element templates​
You can edit element templates in any text editor. With the JSON schema, you may get additional editing support like formatting, code completion, and error highlighting.
Connector templates are a specific kind of element template and get a visual preview and editing support in Web Modeler.