The European Commission and Member States focus on developing
services and solutions to implement and further deploy the
Once-Only Technical System (OOTS). To avoid reinventing the
wheel and instead rely on cost-efficient solutions, a catalogue
of reusable services has been developed. This catalogue
comprises a list of services and solutions made available by the
European Commission and Member States to support the deployment
of the system. This list will undergo regular iterations to
ensure the best and most up-to-date support for the national
implementers and developers.
eDelivery eIDAS Common Services Preview Space Intermediary Platform Solutions Testing Communications and Support Vocabularies
eDelivery provides technical specifications and standards,
installable software and ancillary services to allow projects to
create a network of nodes for secure digital data exchange. By
building with eDelivery, public and private organisations from
different sectors can easily create a safe and interoperable
channel to transfer documents and data among each other over a
public or private network.
Harmony eDelivery Access by
NIIS(opens in a new tab)
is a free and actively maintained open source component for
joining one or more eDelivery policy domains. Harmony eDelivery
Access provides a unified technology stack, an automated
installation and upgrade process for selected platforms, and
step-by-step installation and upgrade instructions.
For more details about
Harmony eDelivery Access(opens in a new tab)
phase4 is an open source library that can be used to send and
receive AS4 messages according to the CEF eDelivery Building
Block. It is heavily used in production systems, especially
Peppol-based.
For more details about
phase4(opens in a new tab)
Member States and private institutions have developed and are
offering additional eDelivery solutions and programmes which may
be of use to national implementers.
For more details about these conformant eDelivery solutions:
eDelivery AS4 conformant solutions(opens in a new tab)
OOTS uses the eID Building Block to identify and authenticate
the user. It may also be used by the Data Service if the user is
asked to re-authenticate.
The Data Service Directory maintains a catalogue of evidence
providers with the evidence types they are able to provide upon
request using their Data Services. It is used in the evidence
exchange process by the evidence requesters to discover the
evidence providers that can provide the evidences they require,
and the required metadata.
The Evidence Broker publishes which types of evidence Member
States can provide to prove a particular requirement of a
procedure. Using the mapping from criteria or information
requirements to possible evidence types, it can find the
evidence types that can prove that the User fulfils the
requirements of the procedure.
The Semantic Repository provides commonly agreed semantic
specifications for the exchange of evidences. The service
provides the following functionalities: ability to externally
reference data models from other components; ability to define
and extract subsets of models; provision of documentation.
Coming soon...
X-Road by
NIIS(opens in a new tab)
is an open source software and ecosystem solution that provides
unified and secure data exchange between organisations. X-Road
can be used as a national or regional data exchange solution.
For more details about
X-Road(opens in a new tab)
More will be added in future iterations...
The Interoperability Test Bed supports public administrations in
validating the structure of their semantic assets according to
European standards, including DCAT-AP and CPSV-AP, provided and
maintained by
SEMIC(opens in a new tab).
For more details about
Interoperability Test Bed(opens in a new tab)
The OOTS PoC-project is funded by the
Nordic Council of Ministers/Cross Border Digital Services (CBDS) Programme(opens in a new tab). The work and research focuses on eDelivery AP, identity
matching, common components, interface for request, test
versions of basic registers, preview.
Testing services allow Member State developers to see how the
interfaces look like and what the expected behaviour is of the
different components. Developers can start with the sample
projects in the testing tools while their components are under
development and gradually replace the testing tools with their
own components.
For more details about
OOTS Testing services(opens in a new tab)
The Simulator covers i.a. OOTS-specific user interface
functionality of an Online Procedure Portal and its Preview
Area; Common Services; eDelivery configuration information for
one eDelivery AS4 product; and Cloud-based testing/demonstration
instances of the above.
To view
the Simulator(opens in a new tab)
All the components used in the Simulator are available as open
source software. You can have a look at the code, or download
and run it yourself. If you're interested, have a look at
the repositories(opens in a new tab).
Please note that this version of the Simulator is aligned with
June 2023 specifications regarding evidence exchange.
The Once-Only Hub is a dedicated environment providing reliable
access to important information, services and support. Anyone
can browse the hub to learn more about the system, programme and
its benefits.
For more details
about Once-Only Hub(opens in a new tab)
The OOTS Newsletter provides regular updates on the
implementation, features, past events, and other relevant news,
both from the European Commission and Member States side. It
also highlights upcoming events.
The Service Desk acts as the single point of contact to address
questions, incidents, and requests reported by the implementers.
Additionally, it provides availability and capacity monitoring
of the European Commission-managed OOTS Common Services to allow
a proactive way of detecting and resolving incidents.
For more details about
OOTS Service Desk/OOTS Support Services(opens in a new tab)
The OOTS Collaborative Space provides Member States with
relevant documentation and information regarding sub-groups,
meetings, and updates related to the Once-Only Technical System,
as well as with a feedback space for identifying and discussing
key issues.
Please note that the Collaborative Space is only accessible for
experts working on SDG and SDG OOTS.
For more details about
SDG OOTS Collaborative Space(opens in a new tab)
The e-Government Core Vocabularies are simplified, reusable and
extensible data models that capture the fundamental
characteristics of a data entity in a context-neutral fashion.
The Core Vocabularies are maintained and updated by
SEMIC(opens in a new tab).
For more details about
Core Vocabularies(opens in a new tab)
Explore the benefits of the Once-Only Technical System and
its development by registering for webinars and other
events.
Catalogue of reusable servicesCatalogue of reusable
services
Architectural design of the Once-Only Technical System
eDelivery Building Block
Harmony eDelivery Access
phase4
Other conformant eDelivery solutions
If your solution is not mentioned on this list, but you would
like to be included, please contact
the Service Desk(opens in a new tab).
eID Building Block
Data Service Directory specifications
Evidence Broker specifications
Semantic Repository specifications
X-Road
Interoperability Test Bed
OOTS Proof-of-Concept Project
OOTS Testing services
The Simulator
Once-Only Hub
Once-Only Technical System Newsletter
OOTS Service Desk/OOTS Support Services
SDG OOTS Collaborative Space
Core Vocabularies
Events
Overview
Content Tools