# GameCenterMatchmakingRuleCreateRequest.Data.Attributes The attributes for a rule that you create. ``` object GameCenterMatchmakingRuleCreateRequest.Data.Attributes ``` ## Discussion The possible values for the `type` field are: |`COMPATIBLE`|Rules that enforce constraints on two match requests and return a Boolean value.  For example, a rule that requires devices to run the same version of your game, or finds players that share a common language or game settings.  If you set the `type` field to `COMPATIBLE`, compare the two match requests in the `requests` array in your expression, as in:  `areCompatibleAppVersions(requests[0], requests[1])` | |------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| |`DISTANCE` |Rules that evaluate the similarity of two match requests and return a numeric value between `0.0` and `1.0`.  For example, rules that compare the latency or distance between players and find players with the exact same language and region setting.  If you set the `type` field to `DISTANCE`, evaluate the two match requests in the `requests` array in your expression, as in:  `geoLatency(requests[0], requests[1])` | |`MATCH` |Rules that evaluate properties across all compatible requests.  For example, rules that prefer match candidates with more players but allows less players after a period of time, compare the difference in skill levels of players to a desired skill level that’s a function of time, and find players that have compatible game configurations that loosen over time.  If you set the type field to `MATCH`, use the `requests` array in the expression to get all the compatible matches.| |`TEAM` |Rules that evaluate the assignment of players to teams and return a Boolean value.  For example, rules that make the number of players on each team the same, balance the skill levels on each team for a fair match, and keep invited friends on the same team.  If you set the `type` field to `TEAM`, use the `teams` array to get all the teams associated with the rule set. | --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)