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6.1 VRR Scheme data types

VRR proxy is a Scheme object used for representing VRR

entities. Proxies are compared using the eq? command: if p1 and p2 are proxies of the same entity, then (eq? p1 p2) returns true. There are four kinds of proxies: obj, go, anchor, and hanger, and they are associated with the appropriate VRR entities of the same name. obj proxies are classified by their type. There are two types of them: document and page. go proxies can be classified by their type and subtype.