question: public Properties extractProperties ( Iterable < Map . Entry < String , String > > propSrc ) { Properties result = new Properties ( ) ; for ( Map . Entry < String , String > entry : propSrc ) { String name = entry . getKey ( ) ; if ( isNamespacedProperty ( name ) ) { String val = entry . getValue ( ) ; result . setProperty ( name , val ) ; } } return result ; }
target:  Extract all properties in this namespace that can be found in the provided property source