Definition of extension points
Define the next extension point with the extension in the manifest.
- Ribbon
- event
- Command
Expansion point details
For more information on extension points, see Extension points.
Implementation example
Here is an example implementation of a simple extension point that defines one button that performs the function of the extension.
- In the - extensionPointssection, define- ribbon, which represents the composition of the ribbon, and- commands, which represents the execution command.
- The ribbon defines the tabs, groups, buttons, and other controls that make up the ribbon. 
- Assign the command to be executed to the button. - In this example, the - extensionPoints.ribbon.tabs [0] .groups [0] .controls [0] .commandproperty is specified with the ID- Command.SayHelloof the command to be defined later.
- The command defines the ID and title of the execution command and the function name of the command handler. - In this example, the command with ID - Command.SayHellois defined as the first execution command in the- extensionPoints.commandsproperty. The name- SayHelloin the- extensionPoints.commands [0] .execFuncproperty is the function name of the command handler implemented in the entry point executable program- main.cs.
{
  //Extension definition
  "name": "Hello World",
  "main": "main.cs",
  "lifecycle": "application",
  //Extension point definition
  "extensionPoints": {
    //Ribbon
    "ribbon": {
      "tabs": [
        //Ribbon tab
        {
          "id": "HelloWorld.MainTab",
          "label": "Hello World",
          "orderBefore": "System.View",
          "groups": [
            //Groups in the ribbon tab
            {
              "id": "HelloWorld.FirstGroup",
              "label": "Group 1",
              "controls": [
                //button
                {
                  "id": "HelloWorld.SayHelloButton",
                  "type": "Button",
                  "label": "Say Hello",
                  "imageLarge": "images/About.png",
                  "command": "Command.SayHello"
                }
              ]
            }
          ]
        }
      ]
    },
    //Command
    "commands": [
      {
        "id": "Command.SayHello",
        "execFunc": "SayHello"
      }
    ]
  }
}
JSON Schema
Published JSON Schema Definition (manifest.schema.json) on GitHub to help you edit the manifest. I am. Please download and use it.