Identifier

Data Type.

A String which specifies an identifier used in Minecraft. They are used to refer to items, blocks, status effects, locations in data or resource packs, and a lot of other things.

An identifier consists of a namespace and a path. Namespace and path are separated with a colon. An identifier may only contain lower-case letters (a-z), digits (0-9), -, _ and .. It can include at most a single colon (:) for separation. The path may contain / to indicate "folders", but the namespace may not.

If no namespace is specified, it will default to minecraft.

Read more here: Minecraft Wiki: Namespaced ID

Example:

{
    "type": "origins:block",
    "block": "iron_ore"
}

A block identifier specifying iron ore. The namespace is not specified, thus defaults to minecraft.

{
    "type": "origins:origin",
    "origin": "origins-classes:stealth"
}

An origin identifier specifying the stealth status effect added by the Origins: Classes add-on.