/**
 *  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.
 */
export interface Expr {
    /**
     *  Textual representation of an expression in Common Expression Language
     *  syntax.
     */
    expression?: string;
    /**
     *  Optional. Title for the expression, i.e. a short string describing
     *  its purpose. This can be used e.g. in UIs which allow to enter the
     *  expression.
     */
    title?: string;
    /**
     *  Optional. Description of the expression. This is a longer text which
     *  describes the expression, e.g. when hovered over it in a UI.
     */
    description?: string;
    /**
     *  Optional. String indicating the location of the expression for error
     *  reporting, e.g. a file name and a position in the file.
     */
    location?: string;
}
export declare namespace Expr {
    const name = "google.type.Expr";
}
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