Expr : Represents a textual expression in the Common Expression Language (CEL) syntax. CEL is a C-like expression
language. The syntax and semantics of CEL are documented at https://github.com/google/cel-spec. Example
(Comparison): title: "Summary size limit" description: "Determines if a summary is less than 100
chars" expression: "document.summary.size() < 100" Example (Equality): title: "Requestor is owner"
description: "Determines if requestor is the document owner" expression: "document.owner == request.auth.claims.email"
Example (Logic): title: "Public documents" description: "Determine whether the document should be publicly visible"
expression: "document.type != ‘private’ && document.type != ‘internal’" Example (Data Manipulation):
title: "Notification string" description: "Create a notification string with a timestamp."
expression: "’New message received at ’ + string(document.create_time)" The exact variables and functions that
may be referenced within an expression are determined by the service that evaluates it. See the service
documentation for additional information.