PlantUML uses a special encoding to transform a uml text description like: <uml title=“pte”> Alice → Bob: Authentication Request Bob –> Alice: Authentication Response </uml> into UDfppCbCJbNGjLDmoa-oKd0iBSb8pIl9J4uioSpFKmXABInDBIxXvG9AAkW25Jc2L6DHLboGdrUS2W3B6nef
For example, SyfFKj2rKt3CoKnELR1Io4ZDoSa70000 is the encoded form of:
<uml t=“hello”> Bob→Alice : hello </uml>
<uml> Alice → Bob: Authentication Request Bob –> Alice: Authentication Response
Alice → Bob: Another authentication Request Alice ←- Bob: another authentication Response </uml> <uml title=“activity”> (*) –> “First Activity”
"First Activity" --> (*)
</uml>