/**
 * The type of metadata which can be attached to content entities.
 */ export interface Meta { /**
     * The ID of the user who created the entity.
     */ readonly user ? : string | null ; /**
     * The timestamp at which the entity was created.
     */ readonly time ? : number | null ; /**
     * The ID of the session which the entity was created in.
     */ readonly session ? : string | null ; /**
     * Any other metadata.
     */ readonly [ key ] : any ; }