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Questions tagged [uml]

The Unified Modeling Language is the industry standard for modeling software-intensive systems.

2
votes
1answer
55 views

Modeling “nested” interfaces in UML

I am modeling a system that exposes a number of "plugins" (not known at modeling time) through a web API. I have a number of "system" plugins that permit to interact with the system, something like "...
3
votes
3answers
76 views

Can there be different use case diagrams of the same system for different stakeholders?

Can there be different use case diagrams for the same system with differing levels of complexity? My question arises due to the fact that use case diagrams can represent a single system in a complex ...
1
vote
1answer
38 views

“Screen-states”: How to express all of them in a concise way? [closed]

If my software has some screens, how do i express the various states of those screens? If, for example, I have 3 checkboxes in a screen, so I have 8 combinations total and at first thought, 8 states ...
1
vote
1answer
84 views

UML - Identifying use cases and actors

I'm currently learning object-oriented programming and we have moved on to UML. We are learning about use cases and actors currently and we need to create a list of actors and use cases initiated by ...
1
vote
1answer
48 views

How to depict several sub-options in use case diagrams

Shown in the image below is an example of an actor that can perform an action and this action branches into several options (none of them HAVE to be performed). My question is whether the arrows ...
-2
votes
1answer
39 views

Ordered vs sequence in association in UML

I am trying to understand UML class diagrams. Imagine two classes that are related with each other by association. What is the difference between {ordered} and {sequence} for the association?
2
votes
2answers
60 views

What does message means in UML sequence diagrams?

In UML sequence diagrams, given two objects A and B, if Object A sends a message to Object B. Does this mean the message is a method in Object B which is invoked from Object A?
0
votes
2answers
78 views

Composition - legal class diagram

I wanted to ask if this is a valid class diagram: I tend to think not, because it forces a certain wheel to belong to two vehicles at the same time (because of the 1 multiplicity). If the ...
-2
votes
1answer
65 views

method taking a class parameter

I have recently begun studying UML. All is going fine so far until I saw the following: This is a class Called Point2D It has 2 attributes which are x, type float and y, type float. It has 3 methods ...
1
vote
2answers
124 views

How to model attribute dependency “inside one class” in UML class diagram?

I have the following "software reality in working code" (also no access to it): There is a class Class1 with different attributes AttributeA - sums up all "ordinary attributes" EnumType DataType ...
-2
votes
1answer
26 views

requirements model and UML

I need to create requirements model for my software(first step of software engineering), But I don't know which icon of UML can help me to implement requirements model.
0
votes
2answers
149 views

Is it possible to represent an if statement in a system sequence diagram?

I'd like to highlight that this questions is about a System Sequence Diagram (SSD) and not a simple Sequence Diagram and of course any help would be appreciated! I'm reading Graig Larman's book ...
2
votes
1answer
87 views

How to convert a use case to a use case diagram?

Suppose I have a use case, like this example. Normal Flow: The user will indicate that she wants to order the items that have already been selected. The system will present the billing and shipping ...
1
vote
2answers
66 views

Detecting UML usecase correctly

UML Diagrams says: A use case is a kind of behaviored classifier that specifies a [complete] unit of [useful] functionality performed by [one or more] subjects to which the use case applies in ...
1
vote
1answer
174 views

Problem in creating a correct finite-state-machine for a given short text

I like to create a finite-state machine for the given text below. While solving this, I came accross with several problems I listed at the bottom. (This example is in terms of testing (where you later ...
-5
votes
1answer
75 views

How this diagram can be improved [closed]

I'm looking for failures in this "token based login" design, besides the UML "syntax" errors. Theoretically speaking, it will do the trick when implemented on an small project. If true, sorry about ...
0
votes
3answers
43 views

UML dependency in a UML deployment diagram with two arrow heads

Can I draw mutual dependencies between two artifacts in a deployment diagram as a dashed line with two arrow heads? Or is this a no-go in UML?
0
votes
2answers
80 views

Problem in modelling this because too slow calculation (robot football)

I like to build a component connector view / UML diagram for the given problem but I realized it's way too slow if you try to do it exactly as it's given in the following text. My question is what ...
2
votes
2answers
73 views

If a user delivers a file as input for a use case, what is the actor : the user or the file

Our call center collects requests from customer, which are processed by back office. Much of the requests are passed in spreadsheets by type of request. In view of automating some work of back office, ...
4
votes
1answer
414 views

How do you correctly turn this text into an activity diagram (problem with timer)?

This is only an extract from a very long text, the one I'm not sure about. It's about a photo booth (an automata that makes a picture of you if you insert coin). The automata has a camera that is ...
1
vote
2answers
387 views

Which SOLID principles are broken by this class diagram?

I just read about all the 5 principles S,O,L,I,D and I like test it in little example if I understand them correct. Which SOLID principles are hurt by this class diagram? I think what is broken is ...
2
votes
5answers
253 views

Design pattern for creating object hidden from client

I am having difficulty understanding which design pattern would be best for the following scenario. An application uses a database. That database can either be the production version (SQL) or a test ...
1
vote
0answers
31 views

UML how to model parallel activity with runtime-dependent number of participants

I want to model an activity that involves processing several items in parallel. So to speak, I want to find a Activity Diagram representation for something like the following snippet / pseudocode: ...
1
vote
1answer
158 views

Trying to understand Sequence Diagram

I am trying to understand two sequence diagrams that I have found in the SE course at university of Washington. Can you confirm if my understanding is correct ? Diagram 1: According to my ...
0
votes
1answer
96 views

How to manually model a UML activity Diagram to JSON with Qt C++?

Suppose I have a kind of UML activity diagram with 1-n forks and joins. The assignment of the individual nodes relative to each other is defined by an XML relationship table via UUIDs where each ...
1
vote
1answer
53 views

UML extending class assiciations with generalizations

I have a simple concept like in the image below. Basically there is an Item which can be 1 of 3 types and a character that can be 1 out of 2 types. All generalizations are disjointed. What I'm ...
1
vote
2answers
104 views

Why are fork and join nodes necessary in UML

I have some background in Petri nets, and in my last UML training, the trainer explained how activity diagrams are essentially a form of a Petri net with Petri net semantics. Now read that fork and ...
-3
votes
2answers
84 views

Use Case Diagram for Mobile and Web

Do I need to create a different use case diagram for my mobile app and for my web app? I have a mobile and a web app but mobile users cannot access the web application. Only the admins can do that.
1
vote
1answer
41 views

Can I use UML use cases to model settings?

Is correct to represent setting options using use cases? For example the user can: - enable background updates - change map color - change interval updates From https://www.uml-diagrams.org/use-...
0
votes
3answers
102 views

In which case will a token from an activity join node be rejected?

In an UML activity diagram, join nodes synchronise concurrent flows by regulating the flow of tokens. The UML specifications foresees that tokens can be rejected. Section 15.3.3.4 Join Nodes says: ...
1
vote
1answer
168 views

“join node” and “fork node” for a single branch in UML

Section 15.3.3.3 of UML specification says: Fork Nodes A ForkNode is a ControlNode that splits a flow into multiple concurrent flows. Also 15.3.3.4 says: Join Nodes A JoinNode is a ...
5
votes
1answer
127 views

How “selection behavior” works in UML?

After two hours reading/searching in about examples and usages of selection behavior of object flows, I guess that selects all tokens which satisfy a criteria (like a query) and this can change order ...
0
votes
1answer
65 views

offering multiple tokens at the same time in Activity diagram

UML specification says: If multiple tokens are offered at the same time, then the tokens are offered in the same order as if they had been offered one at a time from the source I want to know "...
2
votes
1answer
42 views

Thematic/Semantic tagging of associations in UML

Is it possible to use semantic tags in UML associations (among classes) to express the wider semantic nature of the relationship? For example, consider the relation that Doctor TREATS Patient. Beyond ...
1
vote
1answer
132 views

How to represent a specific type of interface dependency in component diagram?

I'm currently having a hard time with creating a component diagram that should represent a certain type of component/interface dependency and hope that you can give me some hints. As background, I ...
2
votes
1answer
52 views

Where should this component be in Deployment Diagram

I have a quick question. Imagine this scenario: There is a webapp in server X. There is also another component (file) in server Y. In the webapp, starting, it does: <script src="component from ...
3
votes
1answer
435 views

can I send message to the actor in sequence diagram

Is it correct for the user(actor) in sequence diagram to receive a message from object while<< UI>> is exist in the diagram for example user will request to edit some data ..so the request will ...
-3
votes
1answer
338 views

Difference between UML 2.0 vs 2.5 in use case diagram

I got a question in examination asking to draw an Use case diagram using UML 2.5. However I can't figure out what are the changes in UML 2.5 and 2.0 in Use case diagrams.
0
votes
0answers
21 views

“Normalisation” of XMI documents?

I use Umbrello for editing my UML diagrams, and archive them as XMI files. XMI is a nice, textual format, which should be ideal for traditional source based version control tools such as Git, ...
-1
votes
1answer
70 views

Is there unified methods for system modeling?

There are tons of courses and tutorials about specific technologies and programming languages such as: JS, HTML, Python, etc. However, the field of system analysis lacks the same attention that ...
1
vote
0answers
143 views

UML Class Diagram HashMap with different Key datatype using Qualified Association

By using the qualified association element of UML Class Diagram, we can create HashMap as the datatype of one of our class attributes (see here). In my case, I have to use HashMap with different key ...
-3
votes
1answer
1k views

UML Class Diagram HashMap Data Type

How can I show a Java HashMap data type in UML Class Diagram (or C# dictionary)? I.E. This class: public class Test { private Map<String, String> map; private Map<String, int> ...
1
vote
1answer
682 views

UML Class Diagram with reference data type

For the following UML Class diagram, I have a reference data type Nurse, and I am using it in Hospital Class, is it needed all the time to describe the reference data types in UML Class diagram? Is ...
0
votes
1answer
174 views

UML activity diagram: Action and Activity

Most UML software has two kinds of nodes for the activity diagram: Action and Activity. To me it seems that an Activity could represent something that by itsself would be represented by another ...
1
vote
1answer
61 views

How properly include dependencies to artifacts in UML use cases

I want to express a use case diagram involving two stakeholders, where one stakeholder's use case is co-depending on an artifact, that is produced by the other stakeholder's use case. In the ...
1
vote
1answer
91 views

How to define a system class?

My course notes have stated that a system should have a system class which coordinates the behaviour of all other objects in the system and should be one which is instantiated only once. In many ...
2
votes
2answers
309 views

UML Class Diagrams - Too many associations?

I have recently started a course in software development and I'm having some confusion over modelling my system in a Class Diagram. The context of the system is as follows: The user wants to calculate ...
-5
votes
2answers
85 views

minimalistic software modeling standard as a replacement for UML

I've been using UML 2.x for several years and it really worked for Object-Oriented languages like C# and Java especially when the software was big enough to be considered an enterprise-level system. ...
-1
votes
1answer
202 views

How to read an UML abstract class notation

I am trying to understand UML abstract syntax seen in the UML Specifications. This example below is hard to understand. For example, I don't understand: the {subsets ownedElement}, the hybrid ...
2
votes
2answers
390 views

How to depict the relationship between a Back-End and a DB in a component diagram?

I don't think I completely understand what a component diagram should show. Let's say I have a 3-tier web application for a homestay booking system, similar to airbnb. The 3 main components are clear: ...