# Shdr Endpoint Properties

## `key` (string, required)

Key of the data item in the information flow. May be Source, name or id of the MTConnect Item

Example: `"Xact"`

## `type` (string, enum, required)

Any valid topic name addressing a single data-point

This element must be one of the following enum values:

* `sample`
* `event`
* `condition`
* `message`
* `alarm`

Default: `"sample"`

Example: `"sample"`