How is class inheritance hierarchy being mapped by Grails mongodb plugin? -

we using mongodb plugin in grails.

so found code, domain object called address:

public class address extends embededdomain{     static mapwith = "mongo"      region region;     zone zone;      static mapping = {         id generator: 'identity'         region reference:true         zone reference:true     } } 

embededdomain class in src/groovy

class embeddeddomain {     public embeddeddomain() {         this.datecreated = new date()         this.lastupdated = new date()     } } 

then have organization domain relationship organization has address:

class organization {     static mapwith = "mongo"      address address      static mapping = {         id generator: 'identity'     } } 

what region reference:true mean?

after saving anorganization when enter command show collections in mongodb console not seeing collection name address? rather seeing collection name embededdomain contains address, why happening embededdomain groovy class.