This page documents an OPTIMADE Property Definition. See https://schemas.optimade.org/ for more information.

**ID: https://schemas.optimade.org/defs/v1.2/properties/optimade/structures/nsites**

`nsites`

**Property name:** number of sites

**Description:** An integer specifying the length of the `cartesian_site_positions`

property.

**Type:** integer

**Requirements/Conventions**:

- MUST be equal to the lengths of the list properties elements and elements_ratios, if they are provided.

**Query examples**:

- Match only structures with exactly 4 sites:
`nsites=4`

- Match structures that have between 2 and 7 sites:
`nsites>=2 AND nsites<=7`

**Examples:**

`42`

**JSON definition:**

```
{
"$id": "https://schemas.optimade.org/defs/v1.2/properties/optimade/structures/nsites",
"$schema": "https://schemas.optimade.org/meta/v1.2/optimade/property_definition.json",
"title": "number of sites",
"x-optimade-type": "integer",
"x-optimade-definition": {
"label": "nsites_optimade_structures",
"kind": "property",
"version": "1.2.0",
"format": "1.2",
"name": "nsites"
},
"type": [
"integer",
"null"
],
"description": "An integer specifying the length of the `cartesian_site_positions` property.\n\n**Requirements/Conventions**:\n\n- MUST be equal to the lengths of the list properties elements and elements_ratios, if they are provided.\n\n**Query examples**:\n\n- Match only structures with exactly 4 sites: `nsites=4`\n- Match structures that have between 2 and 7 sites: `nsites>=2 AND nsites<=7`",
"examples": [
42
],
"x-optimade-unit": "dimensionless"
}
```