# Metadata
## `metadata`
Exposes a value to the query system without producing visible content.
This element can be retrieved with the [`query`] function and from the
command line with
[`typst query`]($reference/introspection/query/#command-line-queries). Its
purpose is to expose an arbitrary value to the introspection system. To
identify a metadata value among others, you can attach a [`label`] to it and
query for that label.
The `metadata` element is especially useful for command line queries because
it allows you to expose arbitrary values to the outside world.
```example
// Put metadata somewhere.
#metadata("This is a note") <note>
// And find it from anywhere else.
#context {
query(<note>).first().value
}
```
## Parameters
### value *(required)*
The value to embed into the document.
## Returns
- content