The Diagram Document Object Model represents the set of elements, which you can use to build a diagramming document. The Diagram Document Object Model is built on top of the Nevron DOM and in the context of the Nevron Diagram .NET product is simply called DOM. Following is a brief summary of the most important DOM elements and features:

• Elements
  Diagrams are constructed by elements, which reside in a hierarchy, the root of which is a diagramming document. The DOM provides an extended set of diagram elements, which can be subclassed and further extended.
  
• Documents
  Documents are the root elements in the element hierarchies. They provide core support for services, view management and data exchange capabilities. Multiple views can display and edit a single document simultaneously. Currently there are two types of documents:
  
  Drawing Documents - drawing documents are assembled from stencils, layers, shapes and guidelines. They provide you with the ability to define a vector drawing.
  
  Library Documents - library documents are assembled from masters. They provide you with the ability to store and manage reusable drawing content.
  
• Styling
  

  The visual appearance of all diagram elements is controlled via styles. Styles can be locally specified (per each element individually) or reused via inheritance or style sheets. The usage of inheritance and style sheets greatly minimizes the effort needed to apply a consistent outlook to your diagram, which can easily be changed afterwards. It also decreases the diagram memory footprint.

• Shapes and Groups
  When constructing diagrams, you basically work with shapes. In Nevron Diagram for .NET there are two types of shapes:
  
  - 2D shapes - 2D shapes represent boxes, containing vector or raster primitives and text. 2D shapes are also simply called "shapes".
  
  - 1D shapes - 1D shapes represent lines with different geometry and behavior, which connect other shapes. 1D shapes are also simply called "connectors".
  
  Nevron Diagram for .NET provides an extensive set of predefined shapes (see Predefined Shapes), but also lets you create custom shapes by simply composing drawing primitives (lines, polylines, curves, rectangles, ellipses, text blocks etc.).
  
  All types of shapes can be grouped to create groups. Groups can also be 1D or 2D as you specify. Groups act as if they are a single shape, but are in fact composed from other shapes. Groups can also be used for the creation of custom shapes.
  
  1D shapes have start and end plugs. Both 1D and 2D shapes can have an arbitrary number of ports. A diagram with connections is thus constructed by connecting plugs to ports. Nevron Diagram for .NET also supports an extended type of connection, which is performed by inward and outward ports - e.g. shapes can be connected by ports too.
  
  All types of shapes can have control points. Control points are used to visually change the appearance of a shape by simply dragging them.
  All types of shapes can have an arbitrary number of labels. Labels can be anchored to specific aspects of the shape.
  Optionally expand-collapse, show-hide subtree and frame decorators can be applied to any 2D shape.

• Data Structures 
  Nevron Diagram for .NET has a built-in support for graph and tree data structures and the core operations with them. For example: performing different traversals - depth first, breadth first etc., checking whether the graph is acyclic, whether it is a tree and so forth).
  
  Graph and tree data structures can be generated from the shapes of a drawing document. This gives you the needed flexibility to operate with a visually constructed diagram as if it is a simple graph or tree.
  
• Routing
  Nevron Diagram for .NET has built-in support for automatic obstacle avoidance routing. It addresses user laid-out diagrams in which certain connectors must be automatically rerouted not to cross any obstacles (shapes) in their path. Nevron Diagram for .NET provides support for both Mesh and Grid connectors routing, which is automatically performed. Addressed are issues like minimal bends, port headings, X/Y permeability etc.
• Bridges
  Bridges (hops) are a special type of decoration, which is displayed on connectors self-intersections or intersections with other connectors below it in the Z order. Bridges are automatically generated and maintained.
• Print Manager 
  Drawings can be printed on single or multiple pages. Implemented is built in support for print preview and page setup.
• Raster Image Export
  Drawings can be exported to an image of any type (JPG, PNG, BMP etc.). For drawings defined in absolute measurement units (e.g. inches, millimeters etc.) you can also specify the target device resolution (helps you generate ready to print images).
• Vector Image Export
  Drawings can be exported to Pdf, Flash, SVG, Silverlight (XAML) and EMF vector formats.
• Undo and Redo
  The entire DOM is protected by history. Any property or method, which modifies the elements state records history. The history can contain an unlimited number of actions. History actions can be grouped in transactions. Transactions can be committed or rolled back. Nested transactions are also supported. The history is implemented as a service so you can easily override it, stop or pause it.
• Batches
  Batches serve as a functionality layer between documents and views. Batches are designed to operate with multiple elements and record a single history transaction. Batches take into account the element permissions. Most of operations, which views and commands perform with elements, are implemented with the help of batches.
• Event Handling
  All events are fired from an event sink service, which provides you with the ability to consistently intercept all types of events regardless of the diagram you work with. Interactivity events (mouse, keyboard and drag drop events) support event bubbling.

Nevron Diagram for .NET comes equipped with numerous predefined shapes, which can come handy in many applications. The predefined shapes are consistently created by shape factories. Currently implemented are shape factories, which create shapes from the following categories:

• Basic Shapes 
  Basic geometry shapes (Rectangle, Square, Ellipse, Circle, Rounded Rectangle, N-Grams, N-Gons etc.). A total of 16 basic shapes are provided.
• Flowcharting Shapes
  Shapes related to flowcharting (Process, Decision, Document, Data etc.). A total of 31 flowcharting shapes are provided.
• Symbol Shapes
  Shapes for commonly used symbols (Man, Woman, Male, Female etc.). A total of 47 symbol shapes are provided.
• Brainstorming Shapes 
  Shapes related to brainstorming (Smiley face, Frowny face, Attention, Note etc.). A total of 36 brainstorming shapes are provided.
• Network Shapes
  Shapes related to network modeling (Computer, Server, Printer, Terminal, Hub etc.). A total of 28 networking shapes are provided.
• Simple Network Shapes
  Simplified (with less details) shapes related to network modeling (Computer, Server, Printer, Terminal, Hub etc.). A total of 23 simple networking shapes are provided.
• Traffic Signs Shapes
  Traffic signs shapes (Stop, No entry, Speed limit etc.). A total of 54 traffic sign shapes are provided.
• Electrical Symbols Shapes
  Electrical symbols (Diode, Inductor, Capacitor, Resistor, PNP and NPN transistors etc.). A total of 91 electrical symbols are provided.
• Floor Plan Shapes
  produces shapes related to floor plans (Table, Chair, Couch, Desk, Sink etc.). A total of 110 floor plan shapes are provided.
• Flags Shapes
  Shapes representing country flags (USA flag, UK flag, France flag etc.). A total of 59 country flags are provided.
• Travel Shapes 
  Shapes representing symbols related to travelling. A total of 54 travel shapes are provided.
• Weather Shapes
  Shapes related to weather (Sunny, Cloudy, Snow, Rain etc.). A total of 26 weather shapes are provided.
• Food Shapes
  Shapes related to food (Burger, Pizza, Apple etc.). A total of 33 food shapes are provided.
• Business Process Shapes
  Shapes related to business process modelling (Decision, Activity, Rule etc.). A total of 52 BPM shapes are provided.
• Files and Folders Shapes
  Shapes related to files and folders (Open Folder, File List, Mail etc.). A total of 28 shapes are provided.

This accounts to the incredible amount of 688 genuine clip-art shapes.