--- title: owners - X4 schema type summary: owners: 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 owners: 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 | [`factionexprlookup`](wiki:schema-factionexprlookup-6ea384ee) | 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 | | --- | --- | --- | | [`find_cluster`](wiki:api-md-find-cluster-8f0a8b1a) | `owner` | `libraries/common.xsd` | | [`find_cluster`](wiki:api-md-find-cluster-8f0a8b1a) | `trueowner` | `libraries/common.xsd` | | [`find_cluster`](wiki:api-md-find-cluster-8f0a8b1a) | `coverowner` | `libraries/common.xsd` | | [`find_cluster`](wiki:api-md-find-cluster-8f0a8b1a) | `policefaction` | `libraries/common.xsd` | | [`find_dockingbay`](wiki:api-md-find-dockingbay-a7642449) | `owner` | `libraries/common.xsd` | | [`find_dockingbay`](wiki:api-md-find-dockingbay-a7642449) | `trueowner` | `libraries/common.xsd` | | [`find_dockingbay`](wiki:api-md-find-dockingbay-a7642449) | `coverowner` | `libraries/common.xsd` | | [`find_dockingbay`](wiki:api-md-find-dockingbay-a7642449) | `policefaction` | `libraries/common.xsd` | | [`find_object`](wiki:api-md-find-object-573637c1) | `owner` | `libraries/common.xsd` | | [`find_object`](wiki:api-md-find-object-573637c1) | `trueowner` | `libraries/common.xsd` | | [`find_object`](wiki:api-md-find-object-573637c1) | `coverowner` | `libraries/common.xsd` | | [`find_object`](wiki:api-md-find-object-573637c1) | `policefaction` | `libraries/common.xsd` | | [`find_object_component`](wiki:api-md-find-object-component-4060ecbe) | `owner` | `libraries/common.xsd` | | [`find_object_component`](wiki:api-md-find-object-component-4060ecbe) | `trueowner` | `libraries/common.xsd` | | [`find_object_component`](wiki:api-md-find-object-component-4060ecbe) | `coverowner` | `libraries/common.xsd` | | [`find_object_component`](wiki:api-md-find-object-component-4060ecbe) | `policefaction` | `libraries/common.xsd` | | [`find_room`](wiki:api-md-find-room-37666450) | `owner` | `libraries/common.xsd` | | [`find_room`](wiki:api-md-find-room-37666450) | `trueowner` | `libraries/common.xsd` | | [`find_room`](wiki:api-md-find-room-37666450) | `coverowner` | `libraries/common.xsd` | | [`find_room`](wiki:api-md-find-room-37666450) | `policefaction` | `libraries/common.xsd` | | [`find_sector`](wiki:api-md-find-sector-b7697c98) | `owner` | `libraries/common.xsd` | | [`find_sector`](wiki:api-md-find-sector-b7697c98) | `trueowner` | `libraries/common.xsd` | | [`find_sector`](wiki:api-md-find-sector-b7697c98) | `coverowner` | `libraries/common.xsd` | | [`find_sector`](wiki:api-md-find-sector-b7697c98) | `policefaction` | `libraries/common.xsd` | | [`find_sector_in_range`](wiki:api-md-find-sector-in-range-068400ed) | `owner` | `libraries/common.xsd` | | [`find_sector_in_range`](wiki:api-md-find-sector-in-range-068400ed) | `trueowner` | `libraries/common.xsd` | | [`find_sector_in_range`](wiki:api-md-find-sector-in-range-068400ed) | `coverowner` | `libraries/common.xsd` | | [`find_sector_in_range`](wiki:api-md-find-sector-in-range-068400ed) | `policefaction` | `libraries/common.xsd` | | [`find_ship`](wiki:api-md-find-ship-00f7a52e) | `owner` | `libraries/common.xsd` | | [`find_ship`](wiki:api-md-find-ship-00f7a52e) | `trueowner` | `libraries/common.xsd` | | [`find_ship`](wiki:api-md-find-ship-00f7a52e) | `coverowner` | `libraries/common.xsd` | | [`find_ship`](wiki:api-md-find-ship-00f7a52e) | `policefaction` | `libraries/common.xsd` | | [`find_ship_by_true_owner`](wiki:api-md-find-ship-by-true-owner-ef45104b) | `owner` | `libraries/common.xsd` | | [`find_ship_by_true_owner`](wiki:api-md-find-ship-by-true-owner-ef45104b) | `trueowner` | `libraries/common.xsd` | | [`find_ship_by_true_owner`](wiki:api-md-find-ship-by-true-owner-ef45104b) | `coverowner` | `libraries/common.xsd` | | [`find_ship_by_true_owner`](wiki:api-md-find-ship-by-true-owner-ef45104b) | `policefaction` | `libraries/common.xsd` | | [`find_station`](wiki:api-md-find-station-cde337d1) | `owner` | `libraries/common.xsd` | | [`find_station`](wiki:api-md-find-station-cde337d1) | `trueowner` | `libraries/common.xsd` | | [`find_station`](wiki:api-md-find-station-cde337d1) | `coverowner` | `libraries/common.xsd` | | [`find_station`](wiki:api-md-find-station-cde337d1) | `policefaction` | `libraries/common.xsd` | | [`find_station_by_true_owner`](wiki:api-md-find-station-by-true-owner-800aa44d) | `owner` | `libraries/common.xsd` | | [`find_station_by_true_owner`](wiki:api-md-find-station-by-true-owner-800aa44d) | `trueowner` | `libraries/common.xsd` | | [`find_station_by_true_owner`](wiki:api-md-find-station-by-true-owner-800aa44d) | `coverowner` | `libraries/common.xsd` | | [`find_station_by_true_owner`](wiki:api-md-find-station-by-true-owner-800aa44d) | `policefaction` | `libraries/common.xsd` | | [`match_content`](wiki:api-md-match-content-247d1aba) | `owner` | `libraries/common.xsd` | | [`match_content`](wiki:api-md-match-content-247d1aba) | `trueowner` | `libraries/common.xsd` | | [`match_content`](wiki:api-md-match-content-247d1aba) | `coverowner` | `libraries/common.xsd` | | [`match_content`](wiki:api-md-match-content-247d1aba) | `policefaction` | `libraries/common.xsd` | [All schema types](wiki:schema-types) ยท [Lua / MD value types](wiki:types)