4. A method comprising: determining a query parameter specifying a property value of a resource property of a resource based, at least in part, on a received query, wherein the query is generated to retrieve the resource from a resource store of heterogeneous native format resources; searching through an index store that comprises a plurality of index documents to identify an index document that indicates the resource property and the corresponding property value specified in the query parameter, wherein the plurality of index documents have common formatting; determining whether the index store comprises the index document that indicates the resource property and the corresponding property value specified in the query parameter; in response to determining that the index store comprises the index document that indicates the resource property and the corresponding property value specified in the query parameter, identifying the index document that indicates the resource property and the property value specified in the query parameter and that references the resource in the resource store; and retrieving the resource from the resource store based on said identifying the index document that indicates the resource property and the property value specified in the query parameter and that references the resource in the resource store; in response to determining that the index store does not comprise the index document that indicates the resource property and the corresponding property value specified in the query parameter; determining an inability to identify the index document that references the resource in the resource store; and presenting a notification indicating the inability to identify the resource in the resource store that is associated with the resource property and the corresponding property value specified in the query parameter.
4. A method comprising: determining a query parameter specifying a property value of a resource property of a resource based, at least in part, on a received query, wherein the query is generated to retrieve the resource from a resource store of heterogeneous native format resources; searching through an index store that comprises a plurality of index documents to identify an index document that indicates the resource property and the corresponding property value specified in the query parameter, wherein the plurality of index documents have common formatting; determining whether the index store comprises the index document that indicates the resource property and the corresponding property value specified in the query parameter; in response to determining that the index store comprises the index document that indicates the resource property and the corresponding property value specified in the query parameter, identifying the index document that indicates the resource property and the property value specified in the query parameter and that references the resource in the resource store; and retrieving the resource from the resource store based on said identifying the index document that indicates the resource property and the property value specified in the query parameter and that references the resource in the resource store; in response to determining that the index store does not comprise the index document that indicates the resource property and the corresponding property value specified in the query parameter; determining an inability to identify the index document that references the resource in the resource store; and presenting a notification indicating the inability to identify the resource in the resource store that is associated with the resource property and the corresponding property value specified in the query parameter. 5. The method of claim 4 , further comprising identifying a location of the resource based on said identifying the index document.