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pb.ontology reads the active ontology: the types, shapes, and relationships your graph is governed by. You author this structure in the Shapes Workbench; here you read it at run time.

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pb.ontology

Read the active ontology as a document. 
const ontology = await pb.ontology({ format: "markdown" });
console.log(ontology.markdown || ontology.content);
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format
string
default:"markdown"
Output format, for example markdown.
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projectId
string
Required when your key spans more than one project.

Types

Read and manage entity types with pb.types.

Shapes

Read shapes and their derived artifacts with pb.shapes.