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eDelivery Services

SML FAQs


3. FAQs

 What is SML?
Service Metadata Locator (SML) is a component of CEF eDelivery that is responsible for Dynamic Service Location: in order to send a message, a sender needs to discover where the information about a receiver is stored. The Service Metadata Locator (SML) serves this purpose, and guides the sender towards this location, which is called the Service Metadata Publisher (SMP).
In other words, the SML is used to add/update/delete information about the participants' SMP location on a Domain Name System (DNS). The SML is centralised.

 Do I need an SML?
SML is used in Dynamic discovery mode to help route the messages to the correct recipient.
To ensure that SML is needed for your implementation, an "Assessment Tool " is provided to help you define your needs.

 Which Operating System platforms are supported by SML?
SML being fully developed in Java is therefore portable to any platform supporting the Oracle Java JRE/JDK 7/8.
SML has been deployed and tested successfully on Windows and Linux platforms.
OpenJDK or other manufacturers JRE/JDK are not supported.

 Which Application servers support SML?
SML being fully developed in Java is therefore portable to any platform supporting the Oracle Java JRE/JDK 7/8.
SML has been deployed and tested successfully on Apache Tomcat and Weblogics.
OpenJDK or other manufacturers JRE/JDK are not supported.

 What DBMS does the SML support?
SML can use the following database backends:
  • MYSQL 5.x and above
  • Oracle 11 and above
Users of other databases may benefit from the "Support for additional Databases" space driven by the users of CEF eDelivery. Specific patches for supporting additional databases can be developed and published.

 Can I use SML freely for professional usage?
Yes, SML is released under the "European Union Public Licence".

 From where can I download SML?
The SML artifacts are freely downloadable from the "SML CEF Digital portal".

 What is the location of the SML source code?
The JDBC drivers can be downloaded from the official websites of the manufacturers:


 How does the SML handle communications with an SMP(s)?
The SML offers SOAP Web Services over HTTP/HTTPS to the SMP’s.
Requests received from the SMP’s are stored the SML backend databases and forwarded to a DNS server in order to update the DNS SML domain. 


 How does the SML trust an SMP that requests to perform operations?
The SML will use a compliant SMP certificate that has been issued by a trusted authority.
 What is the difference between SMK and SML?
SMK is the acceptance environment of the SML.
 What are the web services that SML exposes?
The Service Metadata Locator service exposes three interfaces:
  1. ManageServiceMetadataService: Definition of the service to manage Service Metadata.
  2. ManageBusinessIdentifierService: Definition of the service to manage Participant Identifiers.
  3. BDMSLService: Definition of additional specific services.