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The CT2 Development Framework (CTS2DF) is a Plugin-based Java toolkint. It is built on the OSGi

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framework, which allows it to adopt a modular architecture. At the center, the CTS2DF is a web application, capable of being deployed to a web application server such as Tomcat
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, Jetty
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, WebSphere
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, etc. At the core, the CTS2DF starts an Apache Felix
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OSGi environment. This allows the OSGi framework to be self-contained, eliminating the need for special application servers to be used.

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HTTP Requests are accepted and validated by a series of RestControllers. The responsibility of these RestControllers is to accept requests, parse parameters, and check all possible pre-conditions. They also connect the various HTTP requests to the appropriate CTS2 Profile Interfaces

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. Once the RestControllers have accepted the requests and identified the needed CTS2 Profile Interfaces to fulfill it, The process of discovering the available implementations of those needed CTS2 Profile Interfaces begins.

Service Discovery happens via the ServiceProvider

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interface. Each Service Plugin must register this Service as an OSGi Service. In this way, a Service Plugin advertises each CTS2 Profile that it implements.

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LexEVS, implemented as a CTS2 Service Plugin, will implement the following CTS2 Profile Interfaces

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. These Interfaces will delegate to LexEVS functionality as described below.

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The CodeSystemVersionReadService

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CTS2 Profile Interface will be implemented using the LexBIGService
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.

Specifically, the resolveCodingScheme

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method of the LexBIGService will be used
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Code system version read service diagram

4.3.2 CodeSystemVersionQueryService

The CodeSystemVersionQueryService

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CTS2 Profile Interface will be implemented using the LexBIGService interface
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Specifically, the getSupportedCodingSchemes

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method of the LexBIGService
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interface will be used.

Code system version query service diagram

4.3.3 EntityDescriptionReadService

The EntityDescriptionReadService

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CTS2 Profile Interface will be implemented using the LexBIGService
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-> CodedNodeSet interface
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Entity description read service diagram

4.3.4 EntityDescriptionQueryService

The EntityDescriptionQueryService

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CTS2 Profile Interface will be implemented using the LexBIGService
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-> CodedNodeSet interface
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Entity description query service diagram

4.3.5 AssociationQueryService

The AssociationQueryService

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CTS2 Profile Interface will be implemented using the LexBIGService
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-> CodedNodeGraph interface
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Association query service diagram

4.3.6 MapReadService

The MapReadService

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CTS2 Profile Interface will be implemented using a combination of the the MappingExtension interface and the LexBIGService. Specifically, the resolveCodingScheme
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method of the LexBIGService
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will be used, and the MappingExtension can be used to verify the CodingScheme is a Mapping or non-Mapping CodingScheme.

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4.3.7 MapQueryService

The MapQueryService

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CTS2 Profile Interface will be implemented using a combination of the the MappingExtension interface and the LexBIGService
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. Specifically, the getSupportedCodingSchemes
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method of the LexBIGService will be used, and the MappingExtension can be used to verify the CodingScheme is a Mapping or non-Mapping CodingScheme.

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4.3.8 ValueSetReadService

The ValueSetReadService

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CTS2 Profile Interface will be implemented using the LexEVS LexEVSValueSetDefinitionServices Interface.

Value set read service diagram

4.3.9 ValueSetQueryService

The ValueSetQueryService

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4.3.10 ValueSetDefinitionReadService

The ValueSetDefinitionReadService

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CTS2 Profile Interface will be implemented using the LexEVS LexEVSValueSetDefinitionServices Interface.

Value set definition read service diagram

4.3.11 ValueSetDefinitionQueryService

The ValueSetDefinitionQueryService

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CTS2 Profile Interface will be implemented using the LexEVS LexEVSValueSetDefinitionServices Interface.

Value set definition query service diagram

5 URI Resolution

One of the requirements of Resource Oriented Architecture is that every resource must have an identifier. As the Universal Resource Identifier (URI) is the primary identifier used by the Semantic Web, the CTS2 specification calls for all of its resources to be identified by URIs. This results in the need to distinguish the identity of the resource being described from the identity of the description itself, and the basic requirement that all servers in a CTS2 ‘ecosystem’ need to use the same identifiers if information is to be aggregated and shared in a meaningful fashion. The EVS solution for this problem is a URI resolution service, which provides a canonical URI for any local URI and does so as a service.  For the EVS implementation of this service, a URI Resolver Service has been implemented and runs in conjunction with the EVS CTS2 implementation.  While CTS2 users may install their own resolving service, based on the installation instructions here, a service is also running at this location.  A thorough description of this service is to be found here.

6 Glossary

Service Plugin: An OSGi bundle capable of being loaded into the CTS2 Development Framework. In order to be recognized as a Service Plugin, the bundle must export one (and only one) Service of type ServiceProvider

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. Note, however, that the bundle is no excluded from exporting other services – but it must at least export one and only one ServiceProvider Service.

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Platform Specific Model (PSM): An implementation model targeted towards a specific technical platform.

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