question: public static boolean isValidNCName ( String ncName ) { if ( ncName . length ( ) == 0 ) return false ; char ch = ncName . charAt ( 0 ) ; if ( isNCNameStart ( ch ) == false ) return false ; for ( int i = 1 ; i < ncName . length ( ) ; i ++ ) { ch = ncName . charAt ( i ) ; if ( isNCName ( ch ) == false ) { return false ; } } return true ; }
target:  Check to see if a string is a valid NCName according to [4] from the XML Namespaces 1.0 Recommendation