# 5.2.2. Unique identifier Critical to data interoperability is the ability to uniquely, and therefore unequivocally, identify each of the geographic objects in GeoPrism Registry and ensure that this unique identifier is used across information systems. Therefore, it may be beneficial to use geography as a neutral platform for the integration of information and data coming from different sources. While the selection of the appropriate coding scheme associated with each type of geographic object is not a functionality of the platform, GeoPrism Registry has the capacity to capture and maintain such a scheme. The choice of an appropriate coding scheme to be associated with each type of geographic object is therefore critical, as modifying the scheme once implemented in different systems can not only be costly but also have a significant impact on data compatibility as well as on the trust in the common geo-registry's content. Please refer to [Ebener (2022)](https://healthgeolab.net/DOCUMENTS/Guidance_Common_Geo-registry_Ve2.pdf), [World Health Organization (2019)](https://www.who.int/publications-detail-redirect/9789241516495) and [Liu *et al.* (2021)](https://www.unicef.org/documents/implementation-support-guide-development-national-georeferenced-community-health-worker) for more guidance on the choice of an appropriate coding scheme. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.geoprismregistry.com/readme/current-1/geoprism-registry-key-components/5.2-content-related-capacities-of-geoprism-registry/5.2-content-related-capacities-of-geoprism-registry-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.