8/27/2021
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SequenceDiagram.org is an online tool / software for creating UML sequence diagrams. Founded in 2014 with the purpose to improve the efficiency when creating and working with sequence diagrams by combining text notation scripting and drawing by clicking and dragging in the same model.

  1. Sysml Sequence Diagram
  2. SysML FAQ: What Are The SysML Diagram Types?
  3. Model-Based Systems Engineering (MBSE) With SysML

All parsing, processing, and drawing is done client side. The benefit of this is that SequenceDiagram.org is fast and convenient to work with; it also doesn’t transfer your diagram data over the Internet like many other sequence diagram tools on the market. This also means that it is possible to work with the tool offline.

Sysml sequence diagram opt

SysML Diagram Types 15 Modified from UML New to SysML. Basic Features of SysML 16. Source of the Diagrams. Sequence diagrams show the order of behaviors, which. Mar 06, 2019 What is Sequence Diagram? A sequence diagram simply depicts interaction between objects in a sequential order i.e. The order in which these interactions take place. We can also use the terms event diagrams or event scenarios to refer to a sequence diagram. Sequence diagrams describe how and in what order the objects in a system function.

The tool is developed, maintained, and used by people who create a lot of sequence diagrams in their daily work. If you have any question / comments / suggestions / bugs please contact [email protected] The more feedback we get the better we can prioritize.


Privacy and data protection information

The tool itself does not collect data, however services it relies on such as Content Delivery Network, hosting, and cloud storage does. See privacy policy for details.


Sysml Sequence Diagram

Are diagrams/scripts created using SequenceDiagram.org subject to any license?

No license is imposed by SequenceDiagram.org on the generated output. However, like with all images containing text, the fonts used might. The default font used in diagrams is the default sans-serif font selected by your browser. You can specify a different font using the fontfamily keyword, see help for more information. See LICENSE for details.

Sysml

How do I generate a PDF of my sequence diagram?

Diagram

Zoom to a chosen level in the editor and Print to PDF from your browser. The print css makes sure to only show the diagram on the page.


Are there any example sequence diagrams?

Yes, clicking the help menu and selecting 'Instructions' will show examples of all possible diagram elements. A copy icon is available for copying the text notation.


Is the codebase of SequenceDiagram.org open source?

No, the codebase is currently not available under any open source license

Sysml Sequence Diagram


Can I run the SequenceDiagram.org tool in my company's private network (on-prem)?

Yes, by donating 400$ you are licensed to run the SequenceDiagram.org tool and its REST-like API inside your company's network (enterprise license). You are also eligible to receive any new published versions of the software for the duration of 1 year from the donation date by request. Your donation is highly appreciated and allows us to keep SequenceDiagram.org online and free for everyone to use. Please contact [email protected] for any questions.
The software is delivered in three formats:

  • A Node JS application with the Sequencediagram.org tool and a REST-like API for integration with other services, see README.txt for details
  • A war file with the Sequencediagram.org tool for deployment in a Java Servlet Container such as Tomcat, Jboss, Wildfly, Jetty, etc
  • A zip file with the Sequencediagram.org tool for static web page hosting inside the DocumentRoot of a web server such as Apache, IIS, etc, or static on any cloud provider

What libraries are used by SequenceDiagram.org?

  • lz-string is used to create URLs for sharing sequence diagrams. LICENSE
  • Canvas2Svg is used to export the diagram into SVG file format. LICENSE
  • CodeMirror is used as the text editor. LICENSE
  • Font Awesome is used to provide icons for the icon participants. LICENSE
  • Material Design Icons from the Community is used to provide icons for the icon participants. LICENSE
  • Material Design icons by Google (included in materialdesignicons.com collection) is used to provide icons for the icon participants. LICENSE
  • Font Awesome 5 Free is used to provide icons for the icon participants. LICENSE
  • RBush is used for collision detection calculations for onmousemove events. LICENSE
  • MSAL.js from Microsoft is used for authentication towards Microsoft services.
  • OneDrive.js from Microsoft is used for file picker for OneDrive and SharePoint.
  • platform.js from Google is used for authentication towards Google services and file picker for Google Drive and Team Drives.

An example sd is:

The symbols available in sds are: Crypto edit 2 review.

SysML FAQ: What Are The SysML Diagram Types?

SymbolNameDescription
CommentMakes a note anywhere in the diagram. Are always surrounded by * characters.
Note: If you do not want Cradle to automatically add an * go to the Graphics Settings section of Project Setup and turn off the Automatically add asterisks to diagram's comment symbols option.
PictureAllows you to choose the location of a GIF or JPEG image to be displayed as a diagram symbol. An image can also be embedded in the other diagram symbols.
Note CalloutMulti-purpose symbol which attaches to other symbols in order to show certain attributes of the model element. It can show frames, categories, tags, related items, or simply a piece of standalone text.
TagThe Tag symbol is used to display a tag value contained in a symbol's stereotype frames, or cross reference link attributes, anchored to the selected symbol. In the following example the Tag symbol displays the at tag value specified in the Lifeline stereotype Time frame.
The at tag value can be displayed on the diagram using the Tag symbol.
LifelineLifelines represent a structural element (Part) of a system and a timeline flowing top to bottom:
  • Structural Element part of the Lifeline (i.e. Block or Actor) is depicted by a rectangle, with the name and type of the element
  • Timeline part of the Lifeline is depicted by a dashed line descending from the base of the rectangle. Time flows from top to bottom.

When the symbol is placed on the drawing area the Name Symbol dialog is presented to allow you to enter a lifeline object name and to specify the structural element the Lifeline symbol represents. The structural element (i.e. «block » or «actor» element) is specified by the Referenced Element section as shown below. When producing a rapid prototype specify the Lifeline name and then later use the rename symbol option to specify the actual Block or Actor the Lifeline represents.
When the Lifeline Referenced Element is later specified, using the Rename option, an internal link is created between the «lifeline» and the selected referenced element. The Lifeline name or Referenced Element name is displayed using the Hide replacement name checkbox in the Modelling sidebar.
The Lifeline stereotype's specification has two special stereotype frames that can be used to define tags to be associated with the Lifeline on the diagram. The stereotype frames are displayed below along with the menus used to specify a Tag and its value. In the following example the user specified the Lifeline stereotype's specification has two special stereotype frames that can be used to define tags to be associated with the Lifeline on the diagram. The stereotype frames are displayed below along with the menus used to specify a Tag and its value.
The {} Tag symbol was then used to display the after(00:00:14) Tag on a Lifeline as shown below:
If you want to specify an actual stereotype element (i.e. «valueType») in the tag expression instead of a static value:
  1. From the Modelling sidebar select the desired stereotype element to be used in the tag expression and select the right-mouse button and then Links > Make Link To.
  2. [@REF_ID:ref1] is used to place the Launch_Time element into the tag expression. The @REF_ID keyword creates an item reference cross reference between the Lifeline and the Launch_Time element
  3. Select the preview option to see the element in the tag expression
  4. Use the Tag {} symbol to display the at Tag on the Lifeline
Execution SpecificationExecution Specification nodes are overlaid on Lifelines and correspond to executions by the Lifeline Block/Actor. When the Execution Specifications are nested, the control bars are stacked from left to right:
Alternative Combined FragmentA combined fragment is one or more processing sequences enclosed in a frame and executed under specific named conditions. The Alternative Combined Fragment (denoted «Alt») models if…then…else constructs. Alternative Combined Fragment is used to designate a mutually exclusive choice between two or more sets of message sequences to be executed.
An Alternative Combined Fragment element is drawn using a frame with the string «Alt» placed inside the frame's name box in the upper left corner with a user specified name.
The combined fragment frame can be divided into what SysML calls operands (IF Then operand and Else operand) by selecting the frame and pressing the right mouse button and then selecting Swimlanes…. From the Swimlanes dialog specify two swimlanes which will divide the frame into two or more segments: top segment is the IF Then operand, and the bottom segment is the Else operand.
Next, specify a guard condition for the If Then operand. During execution if this operand's guard equates to true, then that operand gets executed and the Else operand gets skipped. Set the guard using the «fragment» stereotype specification's GUARD frame.
The first guard expression is displayed in the upper right corner of the IF Then operand. If there is a second guard expression in the Guard frame, it is displayed in the upper right corner of the Else operand.
Finally, insert the desired messages into the appropriate operand area.
Loop Combined FragmentA Loop Combined Fragment enclosed a series of messages which are repeated. A Loop Combined Fragment is drawn using a frame with the string «Loop» placed inside the frame's name box in the upper left corner with a user specified name:
Next, specify a guard condition that specifies a minimum and maximum looping indicator. Set the guard using the «fragment» stereotype specification's GUARD frame.
The guard expression is displayed in the upper right corner of the Operand.
Finally, insert the desired messages into the fragment frame.
Optional Combined FragmentThe Optional Combined Fragment is used to model a sequence that, given a certain condition, will occur; otherwise the sequence does not occur. An option is used to model a simple if then statement. An Optional Combined Fragment is drawn using a frame with the string «Opt» placed inside the frame's name box in the upper left corner with a user specified name.
Next, specify a guard condition for the If Then operand. During execution if this operand's guard equates to true, then the messages in the operand get executed, and if the condition equates to false the operands gets skipped. Set the guard using the «fragment» stereotype specification's GUARD frame.
The guard expression is displayed in the upper right corner of the operand. Finally, insert the desired messages into the fragment frame.
Parallel Combined FragmentThe Parallel Combined Fragment needs to be used when creating an sd that shows parallel processing activities. A Parallel Combined Fragment is drawn using a frame with the string «Par» placed inside the frame's name box in the upper left corner with a user specified name:
The Parallel Combined Fragment name must be divided into horizontal operands by selecting the frame and choosing Swimlanes… from the context menu. From the Swimlanes dialog specify the number of swimlanes which will divide the frame into parallel processes and provided optional names. In the following example three parallel processing areas are defined named Process A, Process B and Process C:
Finally, insert the desired messages into the fragment frame parallel areas:
Interaction UseAn Interaction Use fragment reuses an existing sd. The Interaction Use fragment is drawn using a frame name placed inside the frame's name box in the upper left corner:
The Name Symbol dialog allows the user to enter a name and to specify the name of the sd to be reused. The Referenced Element selection list in the Name Symbol dialog is used to select the reuse Sequence/Interaction diagram.
After the Referenced Diagram is specified, the frame will be updated with the name of the Referenced Diagram. The user can double click on the fragment to launch the Referenced Diagram:
Create Object MessageThe creation of an instance (i.e. an object) is indicated by the receipt of a Create Object Message.
Destroy ObjectAn object's destruction is indicated by the occurrence of a destroy event, an X on the Lifeline.
Found MessageA Found Message describes the case where there is a receiving event for the message but no sending event.
The Name Symbol dialog allows the user to enter a message name and also optionally specify a Referenced Diagram«activity» or «signal». For a rapid prototype just define a message name. Later select the actual activity being invoked or signal being sent.
The message element (i.e. specification stereotype) has the GUARD stereotype frame that can be used to define a guard expression to be associated with the message on the diagram.
Lost MessageA Lost Message describes the case where there is a sending event for the message but no receiving event. The lost message path is drawn as an arrow with an open arrowhead pointing to a solid circle.
The Name Symbol dialog allows the user to enter a message name and also optionally specify a Referenced Element«activity» or «signal». For a rapid prototype just define a message name. Later select the actual activity being invoked or signal being sent.
The message element (i.e. specification stereotype) has the GUARD stereotype frame that can be used to defined a guard expression to be associated with the message on the diagram. Use the Attributes checkbox in the sidebar to display the guard on the diagram.
If the activity or signal parameters (cross reference linked elements using «has parameter» relationship) there is a parameters checkbox that will display the parameters in the Compartments section of the Modelling sidebar.
Synchronous MessageA Synchronous Message requests behaviour to be performed and then waits for it to complete. A Synchronous Message corresponds to the synchronous invocation of an operation (i.e. «activity»), and is generally accompanied by a Reply Message. The Reply Message can be explicit or implicit.
When the symbol is drawn between two Lifelines, the Name Symbol dialog is presented to allow the user to enter a message name and to optionally specify a Referenced Element «activity». The «activity» element is specified by the Referenced Element selection menu. For a rapid prototype just define a message name. Later, the message Rename option can be used to specify the actual activity to be invoked. The message name or referenced element name is displayed on the diagram by using the Hide replacement name checkbox in the Modelling sidebar.
The message stereotype specification has a GUARD stereotype frame that can be used to define a guard expression to be associated with the message on the diagram. Use the Attributes checkbox in the sidebar to display the guard on the diagram.
If the activity has parameters (cross reference linked elements using «has parameter» relationship) there is a parameters checkbox that will display the activity's parameters in the Compartments section of the Control sidebar.
Asynchronous MessageAsynchronous Messages correspond to the sending of a «signal» that does not require a reply message.
When the symbol is drawn between two Lifelines, the Name Symbol dialog is presented to allow the user to enter a message name and to optionally specify a Referenced Element «signal». The «signal» element is specified by the Referenced Element selection menu. For a rapid prototype just define a message name and then later the message Rename option can be used to specify the actual signal being sent. The message name or referenced element name is displayed on the diagram by using the Hide replacement name checkbox in the Modelling sidebar.
The message stereotype specification has a GUARD stereotype frame that can be used to define a guard expression to be associated with the message on the diagram. Use the Attributes checkbox in the sidebar to display the guard on the diagram.
If the signal has parameters (cross reference linked elements using «has parameter» relationship) there is a parameters checkbox that will display the signal's parameters in the Compartments section of the Control sidebar.
Reply MessageA Reply Message shows a reply to a synchronous operation/service call, together with any return arguments. A synchronous Reply Message is drawn as a dashed arrow with an open arrowhead.
When the symbol is drawn between two Lifelines, the Name Symbol dialog is presented to allow the user to enter a message name and to optionally specify a Referenced Element «activity». The «activity» element is specified by the Referenced Element selection menu. For a rapid prototype just define a message name. Later, the message Rename option can be used to specify the actual activity to be invoked. The message name or referenced element name is displayed on the diagram by using the Hide replacement name checkbox in the Control sidebar.
The message stereotype specification has a GUARD stereotype frame that can be used to define a guard expression to be associated with the message on the diagram. Use the Attributes checkbox in the Control sidebar to display the guard on the diagram.
If the activity has parameters (cross reference linked elements using the «has parameter» relationship) there is a parameters checkbox that will display the activity's parameters in the Control sidebar.
State InvariantA State Invariant on a Lifeline is often useful to add a constraint on the required state of a Lifeline at a given point in a sequence of event occurrences. The state (of a state machine) that the Lifeline is expected to be in is shown as a rounded corner rectangle.
The state element (i.e. specification stereotype) has the EVENT stereotype frame that can be used to define tags associated with the state element.
Duration MarkerA Duration Marker identifies a time constraint on a Lifeline in which an execution specification occurs or one or more messages occur.
The Name Symbol dialog allows the user to enter a name/label for the Duration Marker and also specify the subject Lifeline using the Referenced Element selection list. For a rapid prototype the user can just define a time constraint name to be displayed, and then later use the Referenced Element Lifeline to create a duration tag to be associated with the Duration Marker symbol.
Select the attributes checkbox in the Compartments sidebar panel to display the tag duration.

The symbols along with their default stereotypes, referenced elements, stereotype frames and cross reference link attributes are:

Model-Based Systems Engineering (MBSE) With SysML

SymbolNameDefault StereotypeReferenced ElementStereotype Frames or Cross Reference Link Attributes
CommentNoneNoneNone
PictureNoneNoneNone
Note CalloutNoneNoneNone
TagNoneNoneNone
Lifeline«lifeLine»«block»
«actor»
Lifeline frame: CONSTRAINT
Tag: constraint
Lifeline frame: TIME
Tag: after,
Tag: a,
Tag: duration
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression
Execution SpecificationNoneNoneNone
Alternative Combined Fragment«fragment»NoneFragment frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression
Loop Combined Fragment«fragment»NoneFragment frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression
Optional Combined Fragment«fragment»NoneFragment frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression
Parallel Combined Fragment«fragment» NoneNone
Interaction UseNoneNoneNone
Create Object MessageNoneNoneNone
Destroy ObjectNoneNoneNone
Found Message«message»«activity»
«signal»
Message frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression.
Lost Message«message»«activity»
«signal»
Message frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression.
Synchronous Message«message»«activity»Message frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression.
Asynchronous Message«message»«signal»Message frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression.
Reply Message«message»«activity»Message frame: GUARD
Tag: guard
@Ref can be used in any tag expression to specify an actual stereotype element in the tag expression.
State Invariant«state»NoneState frame: EVENT
Tag: callEvent
Tag: signalEvent
Tag: at
Tag: after
Tag: when
Tag: guard
Tag: behaviourEffect
@Ref can be used in any tag expression to specify an actual stereotype
Duration MarkerNone«lifeline»Lifeline frame: CONSTRAINT
Tag: constraint
Lifeline frame: TIME
Tag: after,
Tag: a,
Tag: duration
@Ref can be used in any tag expression to specify an actual stereotype