NewParseCtx creates new context for parsing a *Node (and its sub-tree) into an output record.

ValidateTransformDeclarations validates `transform_declarations` section of an omni schema and returns the `FINAL_OUTPUT` corresponding Decl.

FinalOutput is the special name of a Decl that is designated for the output for an omni schema.

CustomFuncDecl is the decl for a "custom_func".

Decl is the type for omni schema's `transform_declarations` declarations.

Kind specifies the types of omni schema's input elements.

ResultType specifies the types of omni schema's output elements.