New ontology mapped: GSMA

GSMA in their Iot Big data project has created an ontology for mapping some of the elemtens in the data models.

Now in the folder

data-models > context -> ontologies_files ->gsma.json you have the file you can use with the external @context generator service in the main menu.


Testing the italian and japanese translations of the specifications

Now in the documentation directory of every data model ‘/doc’ you can see two new files and that are the Italian and Japanese translations of the specifications.

They are in beta version, (and they are nice automatic translations, but automatic).

Flag of Japan Flag of Italy

MInor updates widget in the frontend

In the right part of the screen, the last widget logs some of the minor changes that happen on a daily basis in the Smart Data Models Program.

Most of them are thanks to the contributors and people who raise issues in the repositories of the data models.

Only the last ten will be available but if you want the full story you can download the file.



Added all the ontologies coming from SAREF to the external context options

The new service for the generation of externally referenced @context has now available the mapping of the 13 SAREF ontologies.
Check them out in the ontologies_files directory in the data-models repo.

Local context service

If you want to use data models coming from several subjects you will have to merge (somehow) their @contexts.

In this first step, we offer you a service that allows you to choose what subjects you need to merge and to generate the @context.

See the instructions on the page. Now in Main menu -> @context -> Generate a local context

It also provides you with the conflicts in the attributes’ names, in order to let you solve them manually.

In the next step, possibly next week, you will have another service that will allow you to choose what reference ontologies and vocabularies you want to use and replace the Smart data models IRIs with those coming from these external sources.

Survey. What ontologies are you using, if any?

    Smart Data Models Program is willing to ease the use of existing and adopted ontologies.

    Q1: Do you use semantic ontologies for your data

    If you do not know it is quite likely that the answer would be no

    Q2: Do you use them with NGSI-LD?

    Q3: What ontologies are you using (or planning to use)?

    Q4: Are you a member of the Smart Data Models organizations ?

    Member of FIWARE FoundationMember of TMForumMember of IUDXMember of OASCNo membership

    Local @context improved

    The local @context, used by NGSI-LD users of the platform has now taken into account those generic terms which are in the commons-schema.json at the root.

    In fact, there is a @context based on these terms named common-context.jsonld.

    So, the common terms have an IRI with this pattern that in most cases is taking you to an actual page with some information about the term.


    Local context available in all subjects

    We the middle of a reorganization of the @context resources.

    Our first priority is to not touch the @context that is currently available. We grant you we keep it.

    Why is this new option being created?, because otherwise is not possible to solve the conflicts in the IRI when we have attributes with the same ‘name’ but with different meanings. Consequently, their long IRIs (for use in NGSI-LD) need to be different.


    The first step is the creation of a local context.jsonld in the root of every subject. It has been made available today.

    You can see an example of this local @context for the subject weather.

    The long IRI has the format  (predictable):

    “” +  subject name + “/” + attribute name

    Ej. “precipitation”: “”,

    Soon there will be pages on that IRI (they are in fact URL) with some info about the attribute you could use for any purpose.


    1) In the coming future, you will be able to use the local IRI from the Smart Data Models program or commonly used ontologies and vocabularies.

    2) A core of attributes will be kept common for many data models e.g. name, description, alternateName, location, address, etc. They will have IRI in the format

    “” + attribute name

    currently we already have these IRI but there will be also a translator for the properties in the format

    “”: “”,

    3) Additionally,  the Smart Data Models to remain interoperable with external ontologies and vocabularies. so there will be also the option to create a @context with external references in the format

    “”: “schema:name”

    Your comments are welcomed