Developing a Domain Specific Language in Gremlin | DataStax

Developing a Domain Specific Language in Gremlin | DataStax

An earlier Aurelius blog post entitled "Educating the Planet with Pearson," spoke of the OpenClass platform and Titan's role in Pearson's goal of "providing an education to anyone, anywhere on the planet". It described the educational domain space and provided a high-level explanation of some of the conceptual entity and relationship types in the graph. For example, the graph modeled students enrolling in courses, people discussing content, content referencing concepts and other entities relating to each other in different ways. When thinking in graph terminology, these "conceptual entity and relationship types" are expressed as vertices (e.g. dots, nodes) and edges (e.g. lines, relationships), so in essence, the domain model embeds conceptual meaning into graph elements.
At Pearson, the OpenClass domain model is extended into a programmatic construct, a DSL based on Gremlin, which abstracts away the language of the graph. Engineers and analysts can then ask questions of the graph in their educational domain language, as opposed to translating those familiar terms into the language of vertices and edges. The OpenClass DSL defines the graph schema, extends the Gremlin graph traversal language into the language of education, provides standalone functions that operate over these extensions, and exposes algorithms that are developed from those extensions and functions. Together these components form a coarsely-grained API which helps bring general accessibility to complex graph traversals.

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