---
title: xs:nonNegativeInteger - X4 schema type
summary: xs:nonNegativeInteger: An integer greater than or equal to zero.
section: reference
kind: guide
status: reference
updated: 2026-10-27
tags: ["XSD","schema","types"]
sources: ["https://wiki.egosoft.com/X4%20Foundations%20Wiki/Modding%20Support/","https://www.w3.org/TR/xmlschema11-2/"]
---
## Meaning

xs:nonNegativeInteger: An integer greater than or equal to zero.

An XSD type constrains XML, rather than declaring a Lua return or the payload type of event.param. A valid schema value does not prove a successful game effect.

## Schema structure

`W3C XML Schema`

| Property | Value |
| --- | --- |
| Construction | `builtin` |
| Base type | [`xs:integer`](wiki:schema-xs-integer-5c99925f) |

| Constraint | Value |
| --- | --- |
| `minInclusive` | `0` |

restriction narrows a base type; union accepts one of its branches; list describes whitespace-separated items. Enumeration values in one restriction are alternatives. Pattern syntax is XML Schema regex, not Lua patterns or JavaScript RegExp. Constraints inherited from the base type still apply.

## Example and result

```text
0
```

**What happens:** 0 and 12 satisfy this base type; -1 does not.

Object and group variables must already exist in the correct MD / AI context. These are learning fragments, not a complete runnable mission.

## Used by

| Element | Attribute | Schema |
| --- | --- | --- |
| [`run_script`](wiki:api-md-run-script-b4213c2b) | `sinceversion` | `libraries/aiscripts.xsd` |
| [`select`](wiki:api-md-select-7d56c04d) | `min` | `libraries/drops.xsd` |
| [`select`](wiki:api-md-select-7d56c04d) | `weight` | `libraries/objectspawnrules.xsd` |
| [`wait`](wiki:api-md-wait-bde93e56) | `sinceversion` | `libraries/aiscripts.xsd` |


[All schema types](wiki:schema-types) · [Lua / MD value types](wiki:types)