nl_tokens: Initialize a new Edge with inner / outer edge names
pl_tokens: function Edge ( opts ) { this . id = opts . id this . innerformat = opts . inner + '_%s' this . outerformat = opts . outer + '_%s' this . innerkey = format ( this . innerformat , this . id ) this . outerkey = format ( this . outerformat , this . id ) this [ opts . inner ] = function ( cb ) { this . all ( function ( error , array ) { if ( error ) return cb ( error ) if ( ! array || ! <mask> . length ) return cb ( null , array || [ ] ) array = array . map ( function ( gid ) { return format ( this . innerformat , String ( gid ) ) } , this ) db . sunion ( array , cb ) } . bind ( this ) ) } this [ opts . outer ] = function ( cb ) { this . all ( function ( error , array ) { if ( error ) return cb ( error ) if ( ! array || ! array . length ) return cb ( null , array || [ ] ) array = array . map ( function ( gid ) { return format ( this . outerformat , gid ) } , this ) db . sunion ( array , cb ) } . bind ( this ) ) } }