IoT Semantics

Linked data

http://linkeddata.org/

Resource Description Framework (RDF)

https://www.w3.org/RDF/

Json-ld

Json for linked data http://json-ld.org/

Entity and Observations semantic

Semantic for entities and the observations the produce can be defined using the Entity Types and Observation Types This configurable semantic in composed of :

• Type general info (name, description, geometric representation)
• Type specific properties
• In the case of the entity types, the set of observation types that the given entity type can produce

Each specific property contains its own semantic to define :

• Property data type; there are 3 kinds of property types

Select property type

• primitive types

Select primitive type

• collection things type
• collection/single things instances

Select thing instance

• Valid range or regular expression according to the data type
• Translation to the supported languages
• Limit of copies to keep for the property

Entity and Observations instances

Instances are resources of a specific semantic type, that have values for each property defined in the semantic.

Publishing semantic

Semantic for entity and observation types can be defined without letting others see the changes. The action of publishing a type is what makes it visible to other creators, thus available for use by others in their activities. Once published, ht eonly a type can only be extended by its creator.

• Rules

When a type is published:

• it becomes visible to other creators that will be able to use it in their activities
• its supported properties become visible to other creators
• supported properties can only be added as long as their are not required
• existing supported properties cannot be deleted.
• the type can be deleted only if it is not used by anyone