/drawio-logical-diagrams

name: drawio-logical-diagrams
description: 'Creates professional logical flow diagrams and logical system architecture diagrams using draw.io XML format (.drawio files). Use when creating: (1) logical flow diagrams showing data/process flow between system components, (2) logical architecture diagrams representing system structure without cloud provider specifics, (3) BPMN process diagrams, (4) UML diagrams (class, sequence, activity), (5) data flow diagrams (DFD), (6) decision flowcharts, or (7) system interaction diagrams. This skill focuses on generic/abstract representations, not AWS/Azure-specific architectures (use aws-drawio-architecture-diagrams for cloud diagrams).'
allowed-tools: Read, Write, Bash

Draw.io Logical Diagrams Creation

Overview

Create professional logical diagrams in draw.io's native XML format for logical flow diagrams, system architecture visualizations, and abstract process representations using generic shapes and symbols.

When to Use

• Creating logical flow diagrams showing data flow between system components
• Designing logical architecture diagrams (abstract system structure)
• Building BPMN process diagrams for business processes
• Drawing UML diagrams (class, sequence, activity, state)
• Creating data flow diagrams (DFD) for system analysis
• Making decision flowcharts with branching logic
• Visualizing system interactions and sequences
• Documenting logical system design without cloud specifics

**Do NOT use for:** AWS/Azure/GCP architecture diagrams (use `aws-drawio-architecture-diagrams`).

Instructions

Creating a Logical Diagram

1. **Analyze the request**: Understand the system/process to diagram 2. **Choose diagram type**: Flowchart, architecture, BPMN, UML, DFD, etc. 3. **Identify elements**: Determine actors, processes, data stores, connectors 4. **Draft XML structure**: Create the mxGraphModel with proper root cells 5. **Add shapes**: Create mxCell elements with appropriate styles 6. **Add connectors**: Link elements with edge elements 7. **Validate XML**: Verify XML is well-formed and all IDs are unique (see validation checklist below) 8. **Output**: Write the .drawio file for the user

XML Validation Checklist

Before outputting the file, verify:

• [ ] All tags are properly closed (no unclosed `<mxCell>`, `</mxGeometry>`, etc.)
• [ ] All cell IDs are unique (0 and 1 are reserved root cells, use sequential integers starting from 2)
• [ ] All `source` and `target` attributes reference existing cell IDs
• [ ] All `parent` attributes reference existing cell IDs
• [ ] All coordinates (x, y, width, height) are positive numbers
• [ ] Special characters are escaped (`<` → `&lt;`, `>` → `&gt;`, `&` → `&amp;`)
• [ ] Multi-line labels use `&#xa;` or `<br>` with `html=1` in style

Key XML Components

| Component | Description | |-----------|-------------| | `mxfile` | Root element with host and version | | `diagram` | Contains the diagram definition | | `mxGraphModel` | Canvas settings (grid, page size) | | `root` | Container for all cells (must include id="0" and id="1") | | `mxCell` | Individual shapes (vertices) or connectors (edges) |

Draw.io XML Structure

<mxfile host="app.diagrams.net" agent="Claude" version="24.7.17">
  <diagram id="logical-flow-1" name="Logical Flow">
    <mxGraphModel dx="1200" dy="800" grid="1" gridSize="10" guides="1"
      tooltips="1" connect="1" arrows="1" fold="1" page="1"
      pageScale="1" pageWidth="1169" pageHeight="827" math="0" shadow="0">
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />
        <!-- Shapes and connectors here -->
      </root>
    </mxGraphModel>
  </diagram>
</mxfile>

**Key rules:**

• IDs "0" and "1" are reserved for root cells
• Use sequential integer IDs starting from "2"
• Use landscape orientation for architecture diagrams
• All coordinates must be positive and aligned to grid (multiples of 10)

Generic Shapes and Styles

Basic Shape Types

| Shape | Style | |-------|-------| | Rectangle | `rounded=0;whiteSpace=wrap;html=1;` | | Rounded Rectangle | `rounded=1;whiteSpace=wrap;html=1;` | | Ellipse/Circle | `ellipse;whiteSpace=wrap;html=1;` | | Diamond | `rhombus;whiteSpace=wrap;html=1;` | | Cylinder | `shape=cylinder3;whiteSpace=wrap;html=1;boundedLbl=1;` | | Hexagon | `shape=hexagon;perimeter=hexagonPerimeter2;whiteSpace=wrap;html=1;` | | Parallelogram | `shape=ext;double=1;rounded=0;whiteSpace=wrap;html=1;` |

Standard Color Palette

| Element Type | Fill Color | Border Color | Usage | |--------------|------------|--------------|-------| | Process | `#dae8fc` | `#6c8ebf` | Operations/actions | | Decision | `#fff2cc` | `#d6b656` | Conditional branches | | Start/End | `#d5e8d4` | `#82b366` | Terminal states | | Data/Store | `#e1f5fe` | `#0277bd` | Databases/files | | Entity | `#f3e5f5` | `#7b1fa2` | External systems | | Error/Stop | `#f8cecc` | `#b85450` | Error states | | Actor/User | `#ffe0b2` | `#f57c00` | Users/actors | | Container | `#f5f5f5` | `#666666` | Grouping areas |

Connector Styles

**Standard flow:**

edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;endArrow=classic;endFill=1;strokeColor=#666666;strokeWidth=2;

**Dashed (alternative/optional):**

edgeStyle=orthogonalEdgeStyle;dashed=1;dashPattern=5 5;strokeColor=#666666;

**Arrow head styles:**

• `endArrow=classic;endFill=1` - Filled triangle
• `endArrow=open;endFill=0` - Open arrow
• `endArrow=blockThin;endFill=1` - Block arrow

Diagram Types

| Type | Key Elements | |------|--------------| | Logical Flow | Actors (orange), Services (blue), Data Stores (cyan), External Systems (purple) | | Logical Architecture | Layered containers with nested components | | BPMN | Circle (Start/End), Rounded Rectangle (Activity), Diamond (Gateway) | | UML Sequence | Vertical lifelines with message arrows | | DFD | Square (Entity), Circle (Process), Open Rectangle (Data Store) |

Reference Files

For detailed