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+**ZenUML**
+Optional **Title**
+**Participants** can be declared when used or at the start.
+**Annotators** give **participants** a special icon, defined at the doc site.
+**Aliases** give a short **participant** name a more descriptive name when rendered, e.g: A as Alice <- Alice will be rendered, but the code can use A.
+**Messages** between **participants** can be **sync, async, creation or reply**.
+**Sync** use A.\<MessageName\> have a block {} for nested messages
+**Async** use an arrow A->B: How are you? 
+**Creation** new keyword new A(optional params)
+**Reply** three ways to define:
+* Assign var from **Sync** message, e.g: OptionalType a = A.SyncMessage()
+* Return A.SyncMessage { return blaat }
+* @return or @reply on an **async** message
+**Nesting** can be done on both creation and sync messages using blocks {}.
+**Comments** can be added using `// comment` and support markdown.
+**Loops** can be defined using keywords: **while, for, foreach and loop**.
+**Alternative** paths can be sequenced using **if, else** statements. if(blaat) { A.syncMessage(B) }
+**Opt** fragments rendered via `opt { ... }`. This can be useful for optional responses or paths.
+**Parallel** paths can be defined using `par { ... }`.
+**Try/catch/finally** statements are supported as well.
+**@Starter(participant)** to make the line start from a **participant**
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