question: private KeyInfo resolveReferentKeyInfo ( Element element , String baseURI , StorageResolver storage ) throws XMLSecurityException { KeyInfoReference reference = new KeyInfoReference ( element , baseURI ) ; Attr uriAttr = reference . getURIAttr ( ) ; XMLSignatureInput resource = resolveInput ( uriAttr , baseURI , secureValidation ) ; Element referentElement = null ; try { referentElement = obtainReferenceElement ( resource ) ; } catch ( Exception e ) { if ( log . isLoggable ( java . util . logging . Level . FINE ) ) { log . log ( java . util . logging . Level . FINE , "XMLSecurityException" , e ) ; } return null ; } if ( referentElement == null ) { log . log ( java . util . logging . Level . FINE , "De-reference of KeyInfoReference URI returned null: " + uriAttr . getValue ( ) ) ; return null ; } validateReference ( referentElement ) ; KeyInfo referent = new KeyInfo ( referentElement , baseURI ) ; referent . addStorageResolver ( storage ) ; return referent ; }
target:  Resolve the KeyInfoReference Element's URI attribute into a KeyInfo instance.