Property graphs
The graph structure that most graph databases including Neo4j use inherently classifies them into property graphs. A property graph stores the data in the form of nodes. These nodes are linked with relationships that provide structure to the graph. Relationships must have a direction and a label and must exist between a start node and an end node (dangling relationships are not permitted). Both nodes and relationships can have properties, which are key-value pairs that store characteristic information about that entity. The keys have to be strings that describe the property, while the value can be of any type. In property graphs, the number and type of properties can vary across the entities. You can basically store all the metadata ...
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