## Identifier Policy The Digital Health Immnunization project uses URIs whenever Object Identifiers are required. URIs (Uniform Resource Identifiers) are globally unique identifiers for individual objects, as well as for value sets, code systems, profiles, namespaces, and more. URIs is the preferred object identifiers for FHIR objects, and is usually represented as URLs. All URIs used in eHealth Ontario projects must conform to eHealth Ontario's URI Management Policy. For more information, or to obtain the proper URLs for use in this project, contact the eHealth Ontario Architecture & Standards Division at architecture@ehealthontario.on.ca The base URL for the FHIR interface will be referred to as “[base]” in the sections and examples below. Please note that base URL might change over time. The base for Naming System (namespace of identifiers and code system of local terminologies) is https://ehealthontario.ca/API/FHIR/NamingSystem. In the sections and examples below, the base for global identifier namespaces will be referred to as "[id-system-global-base]", the base for local identifier namespaces will be referred to as “[id-system-local-base]” and the base for local code systems will be referred to as “[code-system-local-base]”. **Table: Identifier Variables** |Variable|Value| |- |[base]| TBD: https://wsgateway.prod.ehealthontario.ca/API/FHIR/Immunizations/v1/ |[base-structure]|https://ehealthontario.ca/API/FHIR/StructureDefinition | |[id-system-global-base]|https://ehealthontario.ca/API/FHIR/NamingSystem | |[id-system-local-base]|https://ehealthontario.ca/API/FHIR/NamingSystem | |[code-system-local-base]|https://ehealthontario.ca/API/FHIR/NamingSystem |