question: public static String normalize ( String value ) { if ( value == null ) return value ; value = value . trim ( ) ; if ( value . indexOf ( "  " ) == - 1 ) return value ; boolean space = false ; int len = value . length ( ) ; StringBuffer b = new StringBuffer ( len ) ; for ( int i = 0 ; i < len ; i ++ ) { char v = value . charAt ( i ) ; if ( v == ' ' ) { if ( ! space ) b . append ( v ) ; space = true ; } else { b . append ( v ) ; space = false ; } } return b . toString ( ) ; }
target:  Normalize an attribute value (ID-style). CDATA-style attribute normalization is already done.