Actor	Description	HIEOS?
Document Registry	Acts as a record locator service. Stores meta-data describing documents resident in federated repositories.	Yes
Document Repository	Storage location for documents. Documents can be PDF, images, XML, text documents, etc.	Yes
Patient Identity Source	Source of patient identities that must be known to the Document Registry before meta-data submissions are allowed.	Yes (Client)
Document Consumer	Client application (could be an EMR system) that is interested in viewing shared patient records.	Yes (Client)
Document Source	Client application (typically an EMR system) that publishes documents for sharing within a broader community.	Yes (Client)

HIEOS implements each IHE XDS.b transaction as indicated in the diagram below:

IHE Cross Community Access (XCA)

HIEOS provides support for the following IHE XCA actors:

Actor	Description	HIEOS?
Initiating Gateway	Responds to document requests within a health information sharing community. Retrieves documents within local and remote communities.	Yes
Responding Gateway	Responds to document requests from remote health information sharing communities.	Yes
Document Registry	Acts as a record locator service. Stores meta-data describing documents resident in federated repositories.	Yes
Document Repository	Storage location for documents. Documents can be PDF, images, XML, text documents, etc.	Yes
Document Consumer	Client application (could be an EMR system) that is interested in viewing shared patient records.	Yes (Client)

HIEOS implements each IHE XCA transaction (implementing the XDS Affinity Domain Option) as indicated in the diagram below:

Technical Description

HIEOS is implemented following a layered architecture pattern as depicted in the diagram below:

The table below provides a brief description of each key HIEOS component:

Component	Description	Category
xtest	Client test harness provided by HIEOS.	Applications
xwebtools	Web application that includes an XDS.b Registry and Repository viewer.	Applications
logbrowser	Web application that provides a means to view HIEOS transaction logs.	Applications
XDS.b Registry	XDS.b Registry Axis2 Web Service.	Services
XDS.b Repository	XDS.b Repository Axis2 Web Service.	Services
XCA Gateway	XCA Gateway (Initiating and Responding) Axis2 Web Service.	Services
OMAR freebXML Registry	XDS.b Registry ebXML v3 storage mechanism.	Database Access Components
ADT	Stores patient registration data in support of XDS.b Registry operations.	Database Access Components
XLog	Message driven bean that logs HIEOS transactions asynchronously.	Database Access Components
RepoImpl	XDS.b Repository storage mechanism. Currently configured to store XDS.b documents in an RDBMS.	Database Access Components
Web Service Framework (Axis2)	Provides web services infrastructure used by HIEOS.	Infrastructure
Java Database Connectivity (JDBC)	Provides database access layer to underlying RDBMS for all HIEOS storage requests.	Infrastructure
Application Server (GlassFish ESB)	Provides J2EE-compliant web application server environment.	Infrastructure
RDBMS (MySQL, PostGres)	Provides RDBMS storage mechanism for HIEOS.	Infrastructure