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<!ELEMENT spatial-constraint (bucket, operator, (box | polygon | placename ))>

has multiple. coverage. placename. name. name coordinates. may have multiple. Middleware–Gazetteer Integration. Architecture. Gazetteer Data Model. query w/ placename constraint. middleware. gazetteer. query w/ coordinate constraint. collection driver. Restrictions:

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<!ELEMENT spatial-constraint (bucket, operator, (box | polygon | placename ))>

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  1. has multiple coverage placename name name coordinates may have multiple Middleware–Gazetteer Integration Architecture Gazetteer Data Model query w/ placename constraint middleware gazetteer query w/ coordinate constraint collection driver Restrictions: 1. Names must be unique within a coverage 2. Non-point placenames must be described as regions <!ELEMENT spatial-constraint (bucket, operator, (box | polygon | placename))> <!ELEMENT placename (placename?)> <!ATTLIST placename coverage CDATA #REQUIRED name CDATA #REQUIRED> <placename coverage=“countries” name=“United States”> <placename coverage=“ZIP codes” name=“93106”/> </placename> Greg Janée 3/28/00

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