---
title: infolibrarytypelookup - X4 schema type
summary: infolibrarytypelookup: X4 attribute schema type: base types, constraints and value alternatives.
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

infolibrarytypelookup: X4 attribute schema type: base types, constraints and value alternatives.

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

`libraries/common.xsd`

| Property | Value |
| --- | --- |
| Construction | `restriction` |
| Base type | [`xs:string`](wiki:schema-xs-string-d5652e9b) |

| Constraint | Value |
| --- | --- |
| `enumeration` | `shiptypes_xl` |
| `enumeration` | `shiptypes_l` |
| `enumeration` | `shiptypes_m` |
| `enumeration` | `shiptypes_s` |
| `enumeration` | `shiptypes_xs` |
| `enumeration` | `stationtypes` |
| `enumeration` | `moduletypes_production` |
| `enumeration` | `moduletypes_build` |
| `enumeration` | `moduletypes_storage` |
| `enumeration` | `moduletypes_habitation` |
| `enumeration` | `moduletypes_defence` |
| `enumeration` | `moduletypes_communication` |
| `enumeration` | `moduletypes_dock` |
| `enumeration` | `moduletypes_pier` |
| `enumeration` | `moduletypes_other` |
| `enumeration` | `moduletypes_processing` |
| `enumeration` | `moduletypes_venture` |
| `enumeration` | `moduletypes_welfare` |
| `enumeration` | `weapons_lasers` |
| `enumeration` | `weapons_missilelaunchers` |
| `enumeration` | `weapons_turrets` |
| `enumeration` | `weapons_missileturrets` |
| `enumeration` | `shieldgentypes` |
| `enumeration` | `enginetypes` |
| `enumeration` | `thrustertypes` |
| `enumeration` | `missiletypes` |
| `enumeration` | `marines` |
| `enumeration` | `unique_npcs` |
| `enumeration` | `wares` |
| `enumeration` | `productionmethods` |
| `enumeration` | `researchmethods` |
| `enumeration` | `researchables` |
| `enumeration` | `inventory_wares` |
| `enumeration` | `races` |
| `enumeration` | `factions` |
| `enumeration` | `licences` |
| `enumeration` | `entitytypes` |
| `enumeration` | `equipmentmods` |
| `enumeration` | `paintmods` |
| `enumeration` | `clothingmods` |
| `enumeration` | `software` |
| `enumeration` | `bombs` |
| `enumeration` | `lasertowers` |
| `enumeration` | `mines` |
| `enumeration` | `navbeacons` |
| `enumeration` | `resourceprobes` |
| `enumeration` | `satellites` |
| `enumeration` | `timeline` |
| `enumeration` | `audiologs` |

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

Use the attribute pages below for contextual examples. A generic executable example is not inferred from a type name alone.

## Used by

| Element | Attribute | Schema |
| --- | --- | --- |
| [`add_encyclopedia_entry`](wiki:api-md-add-encyclopedia-entry-dc631156) | `type` | `libraries/common.xsd` |


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