Content deleted Content added
Line 8:
The GQL project is led by Stefan Plantikow (who was the first lead engineer of Neo4j's Cypher for Apache Spark project) and Stephen Cannan (Technical Corrigenda editor of SQL). They are also the editors of the initial early working drafts<ref name="GQL EWD v2.2">{{cite web|url=https://isotc.iso.org/livelink/livelink?func=ll&objId=20836584&objAction=Open|title=''GQL Early Working Draft v2.2''.|last=Eds. Plantikow|first=Stefan|last2=Cannan|first2=Stephen|date=November 2019|website=|publisher=ISO|accessdate=November 9, 2019}}</ref> of the GQL specification.
====The property graph data model====
GQL is a query language specifically for property graphs. A property graph closely resembles a conceptual data model, as expressed in an Entity Relationship model or in a UML class diagram. Entities or concepts are modelled as nodes, and relationships as edges, in a graph. Property graphs are ''multigraphs'': there can be many edges between the same pair of nodes. GQL graphs can be ''mixed'': they can contain directed edges, where one of the endpoint nodes of an edge is the tail (or source) and the other node is the head (or target or destination), but they can also contain undirected (bidirectional or reflexive) edges.
| |||