How do I install the Diagram Catalog skill?

Run npx skillmds@latest add markus41/diagram-catalog in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Diagram Catalog skill do?

Master reference catalog of 190+ diagram types organized by category with selection guide, complexity ratings, stencil references, and XML examples It is listed under Coding & Dev Tools on SkillMD.

Is Diagram Catalog safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Diagram Catalog?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Diagram Catalog free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Diagram Catalog?

markus41 (@markus41) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Diagram Catalog by markus41 — Agent Skill

Name: Diagram Catalog
Author: markus41

Master Diagram Reference Catalog

This is the definitive catalog of every diagram type that can be created with draw.io. Use this to select the right diagram for any situation.

Quick Selection Matrix

#	Category	Diagram Type	Complexity	Best For	Stencils
1	Process	Flowchart	Low	Decision logic, algorithms	built-in
2	Process	Swimlane / Cross-Functional	Medium	Multi-role workflows	built-in
3	Process	BPMN 2.0	High	Formal business processes	mxgraph.bpmn.*
4	Process	Decision Tree	Low	Branch analysis, classification	built-in
5	Process	Decision Table	Medium	Multi-criteria evaluation	built-in
6	Process	Event-Driven Process Chain (EPC)	High	SAP/enterprise processes	built-in
7	Process	Value Stream Map	High	Lean manufacturing flow	mxgraph.lean_mapping.*
8	Process	SIPOC Diagram	Medium	Process inputs/outputs	built-in
9	Process	Workflow Diagram	Low	Task sequences	built-in
10	Process	Algorithm Visualization	Medium	Step-by-step code logic	built-in
11	Process	CI/CD Pipeline Flow	Medium	Build/test/deploy pipelines	built-in
12	Process	Approval Flow	Low	Sign-off chains	built-in
13	Process	Escalation Flow	Low	Incident escalation paths	built-in
14	UML-Structural	Class Diagram	Medium	OOP design, domain models	mxgraph.uml.*
15	UML-Structural	Object Diagram	Medium	Instance snapshots	mxgraph.uml.*
16	UML-Structural	Component Diagram	Medium	Module decomposition	mxgraph.uml.*
17	UML-Structural	Deployment Diagram	Medium	Runtime topology	mxgraph.uml.*
18	UML-Structural	Package Diagram	Low	Namespace organization	mxgraph.uml.*
19	UML-Structural	Composite Structure	High	Internal connectors	mxgraph.uml.*
20	UML-Structural	Profile Diagram	High	Stereotype definitions	mxgraph.uml.*
21	UML-Behavioral	Sequence Diagram	Medium	Message flows over time	mxgraph.uml.*
22	UML-Behavioral	Activity Diagram	Medium	Parallel/concurrent flows	mxgraph.uml.*
23	UML-Behavioral	State Machine Diagram	Medium	Object lifecycle	mxgraph.uml.*
24	UML-Behavioral	Use Case Diagram	Low	User interactions	mxgraph.uml.*
25	UML-Behavioral	Communication Diagram	Medium	Object collaboration	mxgraph.uml.*
26	UML-Behavioral	Interaction Overview	High	Activity + sequence hybrid	mxgraph.uml.*
27	UML-Behavioral	Timing Diagram	High	Time-constrained behavior	mxgraph.uml.*
28	Architecture	C4 Context	Low	System boundary & actors	mxgraph.c4.*
29	Architecture	C4 Container	Medium	Service/app decomposition	mxgraph.c4.*
30	Architecture	C4 Component	Medium	Internal module structure	mxgraph.c4.*
31	Architecture	C4 Code	High	Class-level within component	mxgraph.c4.* + uml
32	Architecture	C4 Deployment	Medium	Infrastructure mapping	mxgraph.c4.*
33	Architecture	ArchiMate Business	High	Business layer modeling	mxgraph.archimate3.*
34	Architecture	ArchiMate Application	High	Application layer	mxgraph.archimate3.*
35	Architecture	ArchiMate Technology	High	Technology/infra layer	mxgraph.archimate3.*
36	Architecture	ArchiMate Strategy	High	Capabilities & resources	mxgraph.archimate3.*
37	Architecture	ArchiMate Implementation	High	Migration planning	mxgraph.archimate3.*
38	Architecture	TOGAF Architecture Vision	High	Enterprise architecture	mxgraph.archimate3.*
39	Architecture	4+1 Architectural View	High	Multi-viewpoint design	built-in
40	Architecture	Hexagonal / Ports & Adapters	Medium	Clean boundaries	built-in
41	Architecture	Onion / Clean Architecture	Medium	Dependency inversion layers	built-in
42	Architecture	Microservices Map	Medium	Service topology & comms	built-in
43	Architecture	Event-Driven Architecture	Medium	Producers, brokers, consumers	built-in
44	Architecture	CQRS / Event Sourcing	High	Read/write path separation	built-in
45	Architecture	DDD Context Map	Medium	Bounded context relationships	built-in
46	Architecture	Service Mesh Topology	High	Sidecar proxy routing	mxgraph.kubernetes.*
47	Data	ER Diagram (Chen)	Medium	Academic data modeling	mxgraph.er.*
48	Data	ER Diagram (Crow's Foot)	Medium	Practical DB design	mxgraph.er.*
49	Data	ER Diagram (IDEF1X)	High	Government/defense DB	mxgraph.er.*
50	Data	Star Schema	Medium	Data warehouse fact/dimension	mxgraph.er.*
51	Data	Snowflake Schema	Medium	Normalized warehouse	mxgraph.er.*
52	Data	DFD Level 0 (Context)	Low	System data boundaries	built-in
53	Data	DFD Level 1-2	Medium	Detailed data flows	built-in
54	Data	JSON Schema Diagram	Medium	API contract visualization	built-in
55	Data	GraphQL Schema Diagram	Medium	Type system visualization	built-in
56	Data	Protocol Buffer Diagram	Medium	Message/service definitions	built-in
57	Data	OpenAPI Endpoint Map	Medium	REST API route tree	built-in
58	Data	Data Lineage / Pipeline	Medium	ETL data provenance	built-in
59	Data	Data Warehouse Architecture	High	Ingestion to analytics	built-in
60	Data	Master Data Management Map	High	Golden record topology	built-in
61	DataStruct	Array / Vector	Low	Indexed sequential storage	built-in
62	DataStruct	Linked List (Singly)	Low	Node-pointer chains	built-in
63	DataStruct	Linked List (Doubly)	Low	Bidirectional traversal	built-in
64	DataStruct	Linked List (Circular)	Low	Ring buffers	built-in
65	DataStruct	Stack (LIFO)	Low	Push/pop operations	built-in
66	DataStruct	Queue / Deque	Low	FIFO operations	built-in
67	DataStruct	Priority Queue	Low	Heap-backed ordering	built-in
68	DataStruct	Binary Tree	Medium	Hierarchical structure	built-in
69	DataStruct	Binary Search Tree	Medium	Sorted tree operations	built-in
70	DataStruct	AVL Tree	Medium	Self-balancing BST	built-in
71	DataStruct	Red-Black Tree	Medium	Balanced with coloring	built-in
72	DataStruct	B-Tree / B+ Tree	High	Database index structure	built-in
73	DataStruct	Trie (Prefix Tree)	Medium	String matching	built-in
74	DataStruct	Heap (Min/Max)	Medium	Priority structure	built-in
75	DataStruct	Hash Table / Hash Map	Medium	Key-value with hashing	built-in
76	DataStruct	Graph (Directed)	Medium	Relationships with direction	built-in
77	DataStruct	Graph (Undirected)	Medium	Symmetric relationships	built-in
78	DataStruct	Graph (Weighted)	Medium	Cost/distance edges	built-in
79	DataStruct	DAG	Medium	Dependency ordering	built-in
80	DataStruct	Skip List	High	Probabilistic search	built-in
81	DataStruct	Bloom Filter	High	Probabilistic membership	built-in
82	DataStruct	Segment Tree	High	Range query structure	built-in
83	Network	Physical Topology (Star)	Low	Hub-and-spoke network	mxgraph.cisco.*
84	Network	Physical Topology (Mesh)	Medium	Fully connected network	mxgraph.cisco.*
85	Network	Physical Topology (Ring)	Low	Token-ring networks	mxgraph.cisco.*
86	Network	Physical Topology (Bus)	Low	Shared backbone	mxgraph.cisco.*
87	Network	Physical Topology (Hybrid)	Medium	Mixed topology	mxgraph.cisco.*
88	Network	Logical Network Topology	Medium	Protocol/VLAN view	mxgraph.cisco.*
89	Network	VLAN Segmentation	Medium	Virtual LAN boundaries	mxgraph.cisco.*
90	Network	DMZ Architecture	Medium	Security zones	mxgraph.cisco.*
91	Network	VPN Topology	Medium	Encrypted tunnels	mxgraph.cisco.*
92	Network	Wireless Coverage Map	Medium	AP placement & range	mxgraph.cisco.*
93	Network	Cloud VPC / VNET	Medium	Cloud virtual networking	aws/azure/gcp
94	Network	Zero Trust Architecture	High	Identity-centric security	mxgraph.cisco.*
95	Network	SDN Architecture	High	Software-defined networking	mxgraph.cisco.*
96	Network	Security Zone Map	Medium	Trust boundary visualization	mxgraph.cisco.*
97	Network	Load Balancer Architecture	Medium	Traffic distribution	mxgraph.cisco.*
98	Network	CDN Distribution Map	Medium	Edge node placement	built-in
99	Network	DNS Resolution Flow	Low	Query chain visualization	built-in
100	Network	Rack Diagram	Medium	Physical equipment layout	mxgraph.cisco.*
101	Cloud	AWS Architecture	Medium	VPC, EC2, S3, Lambda, RDS	mxgraph.aws4.*
102	Cloud	Azure Architecture	Medium	VNET, App Service, AKS	mxgraph.azure.*
103	Cloud	GCP Architecture	Medium	GCE, GKE, Cloud Run	mxgraph.gcp2.*
104	Cloud	Multi-Cloud / Hybrid Cloud	High	Cross-provider topology	multiple
105	Cloud	Serverless Architecture	Medium	Functions, triggers, events	aws/azure/gcp
106	Cloud	Cloud Migration Map	Medium	Source → target mapping	built-in
107	Cloud	Cloud Cost Optimization	Medium	Resource right-sizing	built-in
108	K8s	Kubernetes Cluster	Medium	Control plane + workers	mxgraph.kubernetes.*
109	K8s	Pod/Deployment/Service	Medium	Workload topology	mxgraph.kubernetes.*
110	K8s	Helm Release Map	Medium	Chart dependencies	mxgraph.kubernetes.*
111	K8s	K8s Network Policy	High	Ingress/egress rules	mxgraph.kubernetes.*
112	K8s	K8s RBAC Visualization	High	Subjects → roles → resources	mxgraph.kubernetes.*
113	K8s	Istio / Service Mesh	High	Sidecar proxy topology	mxgraph.kubernetes.*
114	K8s	Docker Compose Architecture	Medium	Multi-container app	built-in
115	K8s	Container Registry Flow	Low	Build → push → pull	built-in
116	Security	STRIDE Threat Model (DFD)	High	Threat identification	built-in
117	Security	Attack Tree	Medium	Threat decomposition	built-in
118	Security	Kill Chain (Lockheed Martin)	Medium	7-phase attack lifecycle	built-in
119	Security	MITRE ATT&CK Matrix	High	Tactic/technique grid	built-in
120	Security	Diamond Model	Medium	Adversary profiling	built-in
121	Security	Security Zone Map	Medium	Trust boundaries	mxgraph.cisco.*
122	Security	Incident Response Playbook	Medium	Response procedure flow	built-in
123	Security	Compliance Control Map	High	Control framework mapping	built-in
124	Wireframe	Lo-Fi Wireframe (Sketch)	Low	Early ideation	mxgraph.mockup.*
125	Wireframe	Mid-Fi Wireframe	Medium	Layout validation	mxgraph.mockup.*
126	Wireframe	Hi-Fi Mockup	High	Pixel-perfect design	mxgraph.mockup.*
127	Wireframe	iOS App Mockup	Medium	iPhone/iPad screens	mxgraph.ios.*
128	Wireframe	Android App Mockup	Medium	Material Design screens	mxgraph.android.*
129	Wireframe	Web Dashboard Mockup	Medium	Admin/analytics UI	mxgraph.mockup.*
130	Wireframe	Landing Page Mockup	Medium	Marketing pages	mxgraph.mockup.*
131	Wireframe	Admin Panel Mockup	Medium	CRUD interfaces	mxgraph.mockup.*
132	Wireframe	E-Commerce Product Page	Medium	Product detail layout	mxgraph.mockup.*
133	Wireframe	User Flow / Screen Flow	Medium	Navigation between screens	mxgraph.mockup.*
134	Wireframe	Interactive Prototype	High	Multi-page with links	mxgraph.mockup.*
135	Wireframe	Design System Sheet	Medium	Component inventory	mxgraph.mockup.*
136	Wireframe	Responsive Breakpoint	Medium	Desktop/tablet/mobile	mxgraph.mockup.*
137	Business	Org Chart	Low	Reporting structure	built-in
138	Business	RACI Matrix	Low	Responsibility assignment	built-in
139	Business	Stakeholder Map	Low	Power/interest grid	built-in
140	Business	Business Model Canvas	Medium	9-block model overview	built-in
141	Business	Lean Canvas	Medium	Startup hypothesis board	built-in
142	Business	Customer Journey Map	Medium	Touchpoints & emotions	built-in
143	Business	Service Blueprint	High	Front/backstage processes	built-in
144	Business	Empathy Map	Low	Think/Feel/Say/Do quadrants	built-in
145	Business	SWOT Analysis	Low	Strengths/Weaknesses/Opportunities/Threats	built-in
146	Business	Porter's Five Forces	Low	Competitive analysis	built-in
147	Business	BCG Matrix	Low	Growth vs market share	built-in
148	Business	Ansoff Matrix	Low	Growth strategy grid	built-in
149	Planning	Gantt Chart	Medium	Project timeline	built-in
150	Planning	Roadmap / Timeline	Low	Feature/release planning	built-in
151	Planning	Kanban Board	Low	Work-in-progress tracking	built-in
152	Planning	Sprint Board	Low	Scrum sprint visualization	built-in
153	Planning	PERT Chart	High	Critical path analysis	built-in
154	Planning	Work Breakdown Structure	Medium	Deliverable decomposition	built-in
155	Planning	Risk Matrix / Heat Map	Low	Likelihood vs impact grid	built-in
156	Planning	Dependency Map	Medium	Blocker visualization	built-in
157	Planning	Milestone Chart	Low	Key dates timeline	built-in
158	Concept	Mind Map (Radial)	Low	Brainstorming, ideation	built-in
159	Concept	Concept Map	Medium	Knowledge relationships	built-in
160	Concept	Fishbone / Ishikawa	Medium	Root cause analysis	built-in
161	Concept	Affinity Diagram	Low	Idea grouping	built-in
162	Concept	Tree Diagram	Low	Hierarchical classification	built-in
163	Concept	Venn Diagram	Low	Set overlap visualization	built-in
164	Concept	Knowledge Graph	High	Entity-relationship network	built-in
165	IaC	Terraform Resource Map	Medium	HCL resource dependencies	aws/azure/gcp
166	IaC	Ansible Playbook Flow	Medium	Role/task execution	built-in
167	IaC	Pulumi Stack Visualization	Medium	Cloud resource graph	aws/azure/gcp
168	IaC	CloudFormation Map	Medium	Stack resources	mxgraph.aws4.*
169	IaC	GitOps Deployment Flow	Medium	Git → cluster sync	built-in
170	Integration	Enterprise Integration (EIP)	High	Messaging patterns	mxgraph.eip.*
171	Integration	Message Queue Architecture	Medium	Kafka/RabbitMQ/SQS	built-in
172	Integration	API Gateway Architecture	Medium	Routing, auth, throttle	built-in
173	Integration	Event Bus / Event Mesh	Medium	Pub-sub topology	built-in
174	Integration	Webhook Flow	Low	HTTP callback chains	built-in
175	Integration	gRPC Service Map	Medium	Protobuf service topology	built-in
176	Integration	GraphQL Federation Map	High	Subgraph composition	built-in
177	SysML	Requirements Diagram	High	Requirement traceability	mxgraph.sysml.*
178	SysML	Block Definition (BDD)	High	System structure blocks	mxgraph.sysml.*
179	SysML	Internal Block (IBD)	High	Internal connections	mxgraph.sysml.*
180	SysML	Parametric Diagram	High	Constraint equations	mxgraph.sysml.*
181	SysML	SysML Activity	High	Flow with object nodes	mxgraph.sysml.*
182	SysML	SysML Sequence	High	Inter-block messaging	mxgraph.sysml.*
183	SysML	SysML State Machine	High	Block state behavior	mxgraph.sysml.*
184	SysML	SysML Use Case	Medium	System interactions	mxgraph.sysml.*
185	SysML	SysML Package	Medium	Model organization	mxgraph.sysml.*
186	Engineering	Circuit Diagram	Medium	Electrical schematics	mxgraph.electrical.*
187	Engineering	Floor Plan	Medium	Room/office layout	mxgraph.floorplan.*
188	Engineering	Rack Diagram	Medium	Data center equipment	mxgraph.cisco.*
189	Engineering	P&ID (Piping)	High	Process instrumentation	built-in
190	Algorithm	Sorting Visualization	Medium	Array state per step	built-in
191	Algorithm	Graph Traversal (BFS/DFS)	Medium	Visit order coloring	built-in
192	Algorithm	DP Table Visualization	Medium	Subproblem grid	built-in
193	Algorithm	Recursion Tree	Medium	Call stack branching	built-in
194	Algorithm	Memory Layout	Medium	Stack/heap regions	built-in
195	Algorithm	Compiler Pipeline	Medium	Lexer→Parser→AST→IR	built-in
196	Algorithm	Finite Automaton (DFA/NFA)	Medium	State machine formal	built-in

Category Details

1. Process & Flow Diagrams (1-13)

1. Flowchart

When to use: Decision logic, algorithms, onboarding guides, troubleshooting trees
Shapes: Rounded rectangle (process), diamond (decision), oval (start/end), parallelogram (I/O), cylinder (data store)
Style: rounded=1;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;
Notation: ISO 5807 standard shapes

<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="start" value="Start" style="ellipse;fillColor=#D5E8D4;strokeColor=#82B366;fontStyle=1;" vertex="1" parent="1">
      <mxGeometry x="200" y="20" width="100" height="50" as="geometry"/>
    </mxCell>
    <mxCell id="proc1" value="Process Data" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;" vertex="1" parent="1">
      <mxGeometry x="175" y="110" width="150" height="60" as="geometry"/>
    </mxCell>
    <mxCell id="dec1" value="Valid?" style="rhombus;whiteSpace=wrap;html=1;fillColor=#FFF2CC;strokeColor=#D6B656;" vertex="1" parent="1">
      <mxGeometry x="200" y="210" width="100" height="80" as="geometry"/>
    </mxCell>
    <mxCell id="e1" style="edgeStyle=orthogonalEdgeStyle;" edge="1" source="start" target="proc1" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
    <mxCell id="e2" style="edgeStyle=orthogonalEdgeStyle;" edge="1" source="proc1" target="dec1" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
  </root>
</mxGraphModel>

2. Swimlane / Cross-Functional Flowchart

When to use: Multi-role workflows, cross-department handoffs, responsibility mapping
Shapes: Swimlane container per role + standard flowchart shapes inside
Style: swimlane;startSize=30;fillColor=#dae8fc;strokeColor=#6c8ebf;

3. BPMN 2.0 Process Diagram

When to use: Formal business processes, automation specs, cross-organizational workflows
Shapes: Start/intermediate/end events (circles), tasks (rounded rectangles), gateways (diamonds), pools/lanes
Stencils: mxgraph.bpmn.event, mxgraph.bpmn.task, mxgraph.bpmn.gateway
Notation: OMG BPMN 2.0 standard

4. Decision Tree

When to use: Classification, risk analysis, game theory, ML feature selection
Shapes: Rectangle (decision nodes), oval (leaf outcomes), diamond (chance nodes)
Layout: Top-down tree with probability/value annotations on edges

5. Decision Table

When to use: Multi-criteria evaluation, business rules, test case matrix
Shapes: Table cells with condition rows and action columns
Style: Grid layout using shape=table; or manual cells

7. Value Stream Map

When to use: Lean manufacturing, identifying waste, lead time analysis
Stencils: mxgraph.lean_mapping.manufacturing_process, mxgraph.lean_mapping.inventory_box, mxgraph.lean_mapping.electronic_info_flow
Notation: Lean/Toyota Production System standard

11. CI/CD Pipeline Flow

When to use: Build/test/deploy pipeline visualization, GitHub Actions/Azure Pipelines/Harness
Shapes: Stage rectangles, parallel lanes, gate diamonds
Color coding: Green (success), Yellow (pending), Red (failed), Blue (running)

2. UML Structural Diagrams (14-20)

14. Class Diagram

When to use: Object-oriented design, domain modeling, API contracts
Shapes: 3-compartment box (name, attributes, methods), inheritance arrows, composition diamonds
Style: shape=mxgraph.uml.classFrame; or manual 3-section box
Notation: UML 2.5, relationships: --|> (inheritance), --* (composition), --o (aggregation), --> (dependency)

<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="class1" value="&lt;b&gt;User&lt;/b&gt;&lt;hr&gt;- id: string&lt;br&gt;- name: string&lt;br&gt;- email: string&lt;hr&gt;+ login(): boolean&lt;br&gt;+ logout(): void" style="text;html=1;align=left;verticalAlign=top;fillColor=#DAE8FC;strokeColor=#6C8EBF;rounded=0;overflow=fill;whiteSpace=wrap;fontSize=11;" vertex="1" parent="1">
      <mxGeometry x="100" y="50" width="200" height="160" as="geometry"/>
    </mxCell>
    <mxCell id="class2" value="&lt;b&gt;AdminUser&lt;/b&gt;&lt;hr&gt;- permissions: string[]&lt;hr&gt;+ grantAccess(): void" style="text;html=1;align=left;verticalAlign=top;fillColor=#DAE8FC;strokeColor=#6C8EBF;rounded=0;overflow=fill;whiteSpace=wrap;fontSize=11;" vertex="1" parent="1">
      <mxGeometry x="100" y="280" width="200" height="120" as="geometry"/>
    </mxCell>
    <mxCell id="inherit" style="endArrow=block;endFill=0;edgeStyle=orthogonalEdgeStyle;" edge="1" source="class2" target="class1" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
  </root>
</mxGraphModel>

16. Component Diagram

When to use: System decomposition, module dependencies, microservice boundaries
Shapes: Component boxes with <<component>> stereotype, provided/required interfaces (lollipop/socket)

17. Deployment Diagram

When to use: Infrastructure documentation, server topology, runtime environments
Shapes: Node boxes (3D cube), artifacts, execution environments

3. UML Behavioral Diagrams (21-27)

21. Sequence Diagram

When to use: API call flows, authentication sequences, microservice communication
Shapes: Lifeline rectangles, activation bars, message arrows (solid=sync, dashed=return, open arrow=async)
Style: shape=mxgraph.uml.lifeline; with HTML labels

<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="client" value="Client" style="shape=mxgraph.sequence.lifeline;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;" vertex="1" parent="1">
      <mxGeometry x="100" y="40" width="100" height="300" as="geometry"/>
    </mxCell>
    <mxCell id="server" value="API Server" style="shape=mxgraph.sequence.lifeline;whiteSpace=wrap;html=1;fillColor=#D5E8D4;strokeColor=#82B366;" vertex="1" parent="1">
      <mxGeometry x="350" y="40" width="100" height="300" as="geometry"/>
    </mxCell>
    <mxCell id="msg1" value="POST /login" style="html=1;verticalAlign=bottom;" edge="1" parent="1">
      <mxGeometry relative="1" as="geometry"><mxPoint x="150" y="120" as="sourcePoint"/><mxPoint x="350" y="120" as="targetPoint"/></mxGeometry>
    </mxCell>
    <mxCell id="msg2" value="200 OK + token" style="html=1;dashed=1;verticalAlign=bottom;" edge="1" parent="1">
      <mxGeometry relative="1" as="geometry"><mxPoint x="350" y="160" as="sourcePoint"/><mxPoint x="150" y="160" as="targetPoint"/></mxGeometry>
    </mxCell>
  </root>
</mxGraphModel>

23. State Machine Diagram

When to use: Object lifecycle, protocol states, UI navigation, order status
Shapes: Rounded rectangle (state), filled circle (initial), bullseye (final), horizontal bar (fork/join)

24. Use Case Diagram

When to use: Requirements capture, system boundary definition, actor identification
Shapes: Stick figure (actor), oval (use case), rectangle (system boundary)

4. Architecture Diagrams (28-46)

28-32. C4 Model (Levels 1-4 + Deployment)

When to use: Progressive architecture at increasing detail
Style: Person=shape=mxgraph.c4.person2;, System=large rounded rect, Container=rounded rect, Component=rect
Color conventions: Your system=blue, external=gray, users=purple, databases=green

<!-- C4 Context Example -->
<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="user" value="&lt;b&gt;Customer&lt;/b&gt;&lt;br&gt;[Person]&lt;br&gt;&lt;br&gt;Places orders and tracks deliveries" style="shape=mxgraph.c4.person2;whiteSpace=wrap;html=1;fillColor=#E1D5E7;strokeColor=#9673A6;fontColor=#333333;align=center;" vertex="1" parent="1">
      <mxGeometry x="250" y="20" width="180" height="160" as="geometry"/>
    </mxCell>
    <mxCell id="system" value="&lt;b&gt;E-Commerce Platform&lt;/b&gt;&lt;br&gt;[Software System]&lt;br&gt;&lt;br&gt;Allows customers to browse, order, and pay" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;align=center;arcSize=10;" vertex="1" parent="1">
      <mxGeometry x="200" y="250" width="280" height="120" as="geometry"/>
    </mxCell>
    <mxCell id="ext1" value="&lt;b&gt;Stripe&lt;/b&gt;&lt;br&gt;[External System]&lt;br&gt;&lt;br&gt;Payment processing" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#F5F5F5;strokeColor=#666666;align=center;arcSize=10;dashed=1;" vertex="1" parent="1">
      <mxGeometry x="550" y="250" width="200" height="120" as="geometry"/>
    </mxCell>
    <mxCell id="e1" value="Browses, orders" style="edgeStyle=orthogonalEdgeStyle;" edge="1" source="user" target="system" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
    <mxCell id="e2" value="Processes payments" style="edgeStyle=orthogonalEdgeStyle;dashed=1;" edge="1" source="system" target="ext1" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
  </root>
</mxGraphModel>

33-37. ArchiMate 3.0

Stencils: mxgraph.archimate3.*
Layers: Business (yellow), Application (blue), Technology (green), Strategy (red), Implementation (purple)
Relationships: Composition, aggregation, assignment, realization, serving, access, influence, triggering, flow

40. Hexagonal Architecture (Ports & Adapters)

When to use: Clean boundary separation between domain logic and infrastructure
Shapes: Central hexagon (domain), small circles on edges (ports), rectangles outside (adapters)

42. Microservices Architecture Map

When to use: Service topology visualization, communication patterns
Shapes: Rounded rectangles per service, solid arrows (sync), dashed arrows (async/events)
Color coding: By tech stack (Go=blue, Java=orange, Node=green, Python=yellow)

45. DDD Bounded Context Map

When to use: Strategic domain design, team ownership boundaries
Shapes: Large dashed rectangles per context, labeled relationships between them
Relationship types: Shared Kernel, Customer-Supplier, Conformist, Anticorruption Layer, Open Host Service, Published Language

5. Data & Database Diagrams (47-60)

47-48. ER Diagrams

Chen notation: Rectangles (entities), ovals (attributes), diamonds (relationships)
Crow's Foot: Table boxes with column lists, cardinality markers (||, <, O)
Stencils: mxgraph.er.*

<!-- Crow's Foot ER Example -->
<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="users" value="&lt;b&gt;users&lt;/b&gt;&lt;hr&gt;🔑 id: uuid PK&lt;br&gt;name: varchar(255)&lt;br&gt;email: varchar(255) UNIQUE&lt;br&gt;created_at: timestamp" style="text;html=1;align=left;verticalAlign=top;fillColor=#DAE8FC;strokeColor=#6C8EBF;overflow=fill;whiteSpace=wrap;" vertex="1" parent="1">
      <mxGeometry x="50" y="50" width="220" height="130" as="geometry"/>
    </mxCell>
    <mxCell id="orders" value="&lt;b&gt;orders&lt;/b&gt;&lt;hr&gt;🔑 id: uuid PK&lt;br&gt;🔗 user_id: uuid FK&lt;br&gt;total: decimal(10,2)&lt;br&gt;status: enum&lt;br&gt;created_at: timestamp" style="text;html=1;align=left;verticalAlign=top;fillColor=#D5E8D4;strokeColor=#82B366;overflow=fill;whiteSpace=wrap;" vertex="1" parent="1">
      <mxGeometry x="400" y="50" width="220" height="150" as="geometry"/>
    </mxCell>
    <mxCell id="rel1" value="" style="edgeStyle=entityRelationEdgeStyle;endArrow=ERmany;startArrow=ERone;html=1;" edge="1" source="users" target="orders" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
  </root>
</mxGraphModel>

50-51. Star Schema / Snowflake Schema

Star: Central fact table (orange) connected to dimension tables (blue)
Snowflake: Dimension tables further normalized into sub-dimensions

52-53. Data Flow Diagrams (DFD)

Level 0: Single process circle showing system boundary with external entities
Level 1-2: Decomposed processes, data stores (parallel lines), data flows (arrows)
Use for: STRIDE threat modeling base diagrams

54-56. Schema Diagrams (JSON, GraphQL, Protobuf)

JSON Schema: Nested boxes with type annotations, required indicators (bold), $ref arrows
GraphQL: Type boxes with field lists, Query/Mutation root types, edge connections
Protobuf: Message boxes with field number annotations, service definitions

6. Data Structure Visualizations (61-82)

Style Conventions for Data Structures

// Node: rounded=1;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;fontFamily=Consolas;
// Highlighted: fillColor=#D5E8D4;strokeColor=#82B366;fontStyle=1;
// Deleted/null: fillColor=#F8CECC;strokeColor=#B85450;dashed=1;
// Pointer arrow: endArrow=block;endFill=1;strokeColor=#6C8EBF;
// Index label: fontSize=10;fontColor=#999999;fontFamily=Consolas;

61. Array

Row of equal-width cells with index labels below
Highlighted cell for access pattern visualization

68-71. Binary Trees (BST, AVL, Red-Black)

Circles for nodes, edges angled left/right
BST: Value ordering annotations
AVL: Balance factor badges (−1, 0, +1) on each node
Red-Black: fillColor=#F8CECC (red) vs fillColor=#1B1B1B;fontColor=#FFFFFF (black)

<!-- Binary Tree Example -->
<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="n50" value="50" style="ellipse;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;fontFamily=Consolas;fontSize=14;fontStyle=1;" vertex="1" parent="1">
      <mxGeometry x="250" y="30" width="50" height="50" as="geometry"/>
    </mxCell>
    <mxCell id="n30" value="30" style="ellipse;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;fontFamily=Consolas;fontSize=14;" vertex="1" parent="1">
      <mxGeometry x="150" y="120" width="50" height="50" as="geometry"/>
    </mxCell>
    <mxCell id="n70" value="70" style="ellipse;whiteSpace=wrap;html=1;fillColor=#DAE8FC;strokeColor=#6C8EBF;fontFamily=Consolas;fontSize=14;" vertex="1" parent="1">
      <mxGeometry x="350" y="120" width="50" height="50" as="geometry"/>
    </mxCell>
    <mxCell id="n20" value="20" style="ellipse;whiteSpace=wrap;html=1;fillColor=#D5E8D4;strokeColor=#82B366;fontFamily=Consolas;fontSize=14;" vertex="1" parent="1">
      <mxGeometry x="100" y="210" width="50" height="50" as="geometry"/>
    </mxCell>
    <mxCell id="e1" edge="1" source="n50" target="n30" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
    <mxCell id="e2" edge="1" source="n50" target="n70" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
    <mxCell id="e3" edge="1" source="n30" target="n20" parent="1"><mxGeometry relative="1" as="geometry"/></mxCell>
  </root>
</mxGraphModel>

75. Hash Table

Vertical array of buckets (left), chained linked lists (right) for collision handling
Hash function annotation with arrow from key to bucket index

76-79. Graphs (Directed, Undirected, Weighted, DAG)

Circular nodes with labels, edges with optional weight labels
DAG: Layer assignment showing topological order
Weighted: Edge labels with cost/distance values

7. Network Diagrams (83-100)

Cisco Stencil Reference

Router:          shape=mxgraph.cisco.routers.router;
Switch L2:       shape=mxgraph.cisco.switches.workgroup_switch;
Switch L3:       shape=mxgraph.cisco.switches.layer_3_switch;
Firewall:        shape=mxgraph.cisco.firewalls.firewall;
Server:          shape=mxgraph.cisco.servers.standard_server;
Database:        shape=mxgraph.cisco.storage.database;
Cloud:           shape=mxgraph.cisco.cloud.cloud;
Access Point:    shape=mxgraph.cisco.wireless.access_point;
Load Balancer:   shape=mxgraph.cisco.switches.content_switch;
VPN Concentrator: shape=mxgraph.cisco.security.vpn_concentrator;

90. DMZ Architecture

Zones: Internet (red), DMZ (yellow), Internal (green), Management (blue)
Pattern: Internet → Firewall → DMZ (web servers, reverse proxy) → Firewall → Internal (app servers, DB)

<!-- DMZ Architecture Sketch -->
<mxGraphModel>
  <root>
    <mxCell id="0"/><mxCell id="1" parent="0"/>
    <mxCell id="internet" value="Internet" style="shape=mxgraph.cisco.cloud.cloud;fillColor=#F8CECC;strokeColor=#B85450;fontSize=14;fontStyle=1;" vertex="1" parent="1">
      <mxGeometry x="250" y="20" width="140" height="80" as="geometry"/>
    </mxCell>
    <mxCell id="fw1" value="Edge FW" style="shape=mxgraph.cisco.firewalls.firewall;fillColor=#F8CECC;strokeColor=#B85450;" vertex="1" parent="1">
      <mxGeometry x="285" y="140" width="70" height="60" as="geometry"/>
    </mxCell>
    <mxCell id="dmz" value="DMZ Zone" style="swimlane;startSize=25;fillColor=#FFF2CC;strokeColor=#D6B656;rounded=1;dashed=1;" vertex="1" parent="1">
      <mxGeometry x="150" y="240" width="340" height="120" as="geometry"/>
    </mxCell>
    <mxCell id="web1" value="Web Server" style="shape=mxgraph.cisco.servers.standard_server;fillColor=#FFF2CC;strokeColor=#D6B656;" vertex="1" parent="dmz">
      <mxGeometry x="30" y="35" width="60" height="60" as="geometry"/>
    </mxCell>
    <mxCell id="proxy" value="Reverse Proxy" style="shape=mxgraph.cisco.servers.standard_server;fillColor=#FFF2CC;strokeColor=#D6B656;" vertex="1" parent="dmz">
      <mxGeometry x="250" y="35" width="60" height="60" as="geometry"/>
    </mxCell>
    <mxCell id="fw2" value="Internal FW" style="shape=mxgraph.cisco.firewalls.firewall;fillColor=#D5E8D4;strokeColor=#82B366;" vertex="1" parent="1">
      <mxGeometry x="285" y="400" width="70" height="60" as="geometry"/>
    </mxCell>
    <mxCell id="internal" value="Internal Zone" style="swimlane;startSize=25;fillColor=#D5E8D4;strokeColor=#82B366;rounded=1;dashed=1;" vertex="1" parent="1">
      <mxGeometry x="150" y="500" width="340" height="120" as="geometry"/>
    </mxCell>
    <mxCell id="app" value="App Server" style="shape=mxgraph.cisco.servers.standard_server;fillColor=#D5E8D4;strokeColor=#82B366;" vertex="1" parent="internal">
      <mxGeometry x="30" y="35" width="60" height="60" as="geometry"/>
    </mxCell>
    <mxCell id="db" value="Database" style="shape=mxgraph.cisco.storage.database;fillColor=#D5E8D4;strokeColor=#82B366;" vertex="1" parent="internal">
      <mxGeometry x="250" y="35" width="60" height="60" as="geometry"/>
    </mxCell>
  </root>
</mxGraphModel>

8. Cloud Architecture (101-107)

AWS Shape Reference (mxgraph.aws4.*)

EC2:          shape=mxgraph.aws4.ec2;
Lambda:       shape=mxgraph.aws4.lambda_function;
S3:           shape=mxgraph.aws4.s3;
RDS:          shape=mxgraph.aws4.rds;
DynamoDB:     shape=mxgraph.aws4.dynamodb;
ALB:          shape=mxgraph.aws4.application_load_balancer;
API Gateway:  shape=mxgraph.aws4.api_gateway;
CloudFront:   shape=mxgraph.aws4.cloudfront;
SQS:          shape=mxgraph.aws4.sqs;
SNS:          shape=mxgraph.aws4.sns;
ECS:          shape=mxgraph.aws4.ecs;
EKS:          shape=mxgraph.aws4.eks;
VPC:          shape=mxgraph.aws4.vpc;
Subnet:       shape=mxgraph.aws4.subnet;
Route53:      shape=mxgraph.aws4.route_53;
CloudWatch:   shape=mxgraph.aws4.cloudwatch;
IAM:          shape=mxgraph.aws4.iam;
Cognito:      shape=mxgraph.aws4.cognito;

Azure Shape Reference (mxgraph.azure.*)

App Service:  shape=mxgraph.azure.app_service;
AKS:          shape=mxgraph.azure.kubernetes_services;
Cosmos DB:    shape=mxgraph.azure.cosmos_db;
SQL Database: shape=mxgraph.azure.sql_database;
Functions:    shape=mxgraph.azure.function_apps;
Event Hub:    shape=mxgraph.azure.event_hubs;
Service Bus:  shape=mxgraph.azure.service_bus;
VNET:         shape=mxgraph.azure.virtual_network;
Load Balancer: shape=mxgraph.azure.load_balancer;
API Mgmt:     shape=mxgraph.azure.api_management;
Key Vault:    shape=mxgraph.azure.key_vaults;

GCP Shape Reference (mxgraph.gcp2.*)

GCE:          shape=mxgraph.gcp2.compute_engine;
GKE:          shape=mxgraph.gcp2.kubernetes_engine;
Cloud Run:    shape=mxgraph.gcp2.cloud_run;
Cloud SQL:    shape=mxgraph.gcp2.cloud_sql;
BigQuery:     shape=mxgraph.gcp2.bigquery;
Pub/Sub:      shape=mxgraph.gcp2.pub_sub;
Cloud Storage: shape=mxgraph.gcp2.cloud_storage;
Cloud Functions: shape=mxgraph.gcp2.cloud_functions;

9. Kubernetes & Container Diagrams (108-115)

Kubernetes Shape Reference (mxgraph.kubernetes.*)

Pod:          shape=mxgraph.kubernetes.pod;
Deployment:   shape=mxgraph.kubernetes.deploy;
Service:      shape=mxgraph.kubernetes.svc;
Ingress:      shape=mxgraph.kubernetes.ing;
ConfigMap:    shape=mxgraph.kubernetes.cm;
Secret:       shape=mxgraph.kubernetes.secret;
PV:           shape=mxgraph.kubernetes.pv;
PVC:          shape=mxgraph.kubernetes.pvc;
Namespace:    shape=mxgraph.kubernetes.ns;
Node:         shape=mxgraph.kubernetes.node;
CronJob:      shape=mxgraph.kubernetes.cronjob;
StatefulSet:  shape=mxgraph.kubernetes.sts;
DaemonSet:    shape=mxgraph.kubernetes.ds;
HPA:          shape=mxgraph.kubernetes.hpa;

10. Security & Threat Diagrams (116-123)

116. STRIDE Threat Model

Base diagram: DFD with processes (circles), data stores (double lines), external entities (rectangles), data flows (arrows)
Trust boundaries: Red dashed lines separating trust zones
Threat annotations: Sticky notes per STRIDE category (Spoofing=purple, Tampering=red, Repudiation=orange, Info Disclosure=yellow, DoS=gray, Elevation=black)

117. Attack Tree

Root: Attack goal at top
OR nodes: Any child attack path suffices (standard branch)
AND nodes: All children required (connected with arc)
Leaf coloring: Red (high risk), Yellow (medium), Green (low/mitigated)

11. Wireframes & UI Mockups (124-136)

Mockup Shape Reference

Browser Window:   shape=mxgraph.mockup.containers.browserWindow;
Window:           shape=mxgraph.mockup.containers.window;
Dialog:           shape=mxgraph.mockup.containers.alertBox;
Button:           shape=mxgraph.mockup.buttons.button;
Checkbox:         shape=mxgraph.mockup.buttons.checkbox;
Radio Button:     shape=mxgraph.mockup.buttons.radioButton;
Text Input:       shape=mxgraph.mockup.forms.rrect;
Dropdown:         shape=mxgraph.mockup.forms.comboBox;
Slider:           shape=mxgraph.mockup.forms.horSlider;
Menu Bar:         shape=mxgraph.mockup.menus.menuBar;
Tabs:             shape=mxgraph.mockup.containers.tabBar;
Data Table:       shape=mxgraph.mockup.containers.dataTable;
Image Placeholder: shape=mxgraph.mockup.graphics.simpleIcon;
Heading:          shape=mxgraph.mockup.text.heading;
Paragraph:        shape=mxgraph.mockup.text.loremIpsum;

iOS Shape Reference (mxgraph.ios.*)

iPhone Frame:     shape=mxgraph.ios.

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Diagram Catalog

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