question: return the value of the specified node attribute if it exists , or null otherwise . concode_field_sep String name concode_elem_sep HashMap attributes concode_elem_sep TreeNode parent concode_elem_sep String body concode_elem_sep ArrayList children concode_field_sep TreeNode findChild concode_elem_sep String getName concode_elem_sep void addAttribute concode_elem_sep String getBody concode_elem_sep Iterator findAttributes concode_elem_sep String toString concode_elem_sep void toString concode_elem_sep Iterator findChildren concode_elem_sep Iterator findChildren concode_elem_sep void removeAttribute concode_elem_sep void setBody concode_elem_sep void addChild concode_elem_sep void removeNode
target: String function ( String arg0 ) { if ( attributes == null ) return ( null ) ; else return ( ( String ) attributes . get ( arg0 ) ) ; }