http://data.ordnancesurvey.co.uk/ontology/spatialrelations/within

used by 6:

• southampton-ac-uk-catering-points-of-service
• southampton-ac-uk-cls-extras
• southampton-ac-uk-places
• southampton-ac-uk-room-features
• southampton-ac-uk-services
• southampton-ac-uk-vending-machines