UML-sequences

Plant UML

PlantUML uses well-formed and human-readable code to render the diagrams.

There are other text formats for UML modelling but PlantUML supports many diagram types and does not need an explicit layouting, though it is possible to tweak the diagrams if necessary.

Process flows

Examples:

if (a) is (yes) then 
:Do Something;
end
else (No)
:Do Something Else;
end

Sequence Diagrams:

Examples:

activate "Marketo Programs" #yellow
"Marketo" -> "Marketo Programs" : Lead Score
"Marketo" -> "Marketo Programs" : Data Management
"Marketo" -> "Marketo Programs" : Set Acquisition
"Marketo" -> "Marketo Programs" : Lead LifeCycle
deactivate  "Marketo Programs" 

participant Participant as Foo
actor       Actor       as Foo1 
boundary    Boundary    as Foo2
control     Control     as Foo3
entity      Entity      as Foo4
database    Database    as Foo5
collections Collections as Foo6
queue       Queue       as Foo7

Objects

class Class as ClassName {
    ClassName : Lead
}

object Object  as obj {
 user:use
}

json JSON {
   "UserObjectId":"120947104=0",
   "FirstName":"John",
   "LastName":"Doe",
}

More information here:

https://plantuml.com/sequence-diagram

made with:

https://plantuml-editor.kkeisuke.com/