Query the Office graph using GQL and SharePoint Online Search REST APIs
From the post:
Graph Query Language (GQL) is a preliminary query language designed to query the Office graph via the SharePoint Online Search REST API. By using GQL, you can query the Office graph to get items for an actor that satisfies a particular filter.
Note The features and APIs documented in this article are in preview and are subject to change. The current additions to the Search REST API are a preliminary solution to make it possible to query the Office graph, mainly intended for the Office Delve experience. Feel free to experiment with querying the Office graph but do not use these features, or other features and APIs documented in this article, in production. Your feedback about these features and APIs is important. Let us know what you think. Connect with us on Stack Overflow. Tag your questions with [office365].
…
An interesting development from Microsoft!
Early days so there is a long way to go before we are declaring relationships between entities inside objects and assigning the entities and their relationships properties.
Still, a promising development.