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An overview of main data entities is given by the Figure below. The central Cytomine data object is the Project that contains User(s), an Ontology, Image(s), Annotation(s) within images, Software, and Properties that can attached to Projects, Images, and Annotations. Each resource is identified by a unique identifier (encoded in 64 bits). In addition, user activity data (such as user position and last connection) are stored in a non-relational database. Properties/Description/AttachedFile/Metadata can be associated to Projects, Images, and Annotations. Properties are key-value pairs, descriptions are rich text descriptions (in HTML), AttachedFile are any supplementary file (e.g. PDF), and Metadata.

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