function
| Library: ISO/IEC 8859 (OMFF8859) Import : omff8859.xmd | Returns: a writable output target for streaming data | 
export string sink function 
   writer   in value encoding-type encoding    optional
          into value string sink   output-data
 Use iso8859.writer to accept UTF-8 encoded data and write that data to a value string sink,
      converted from a UTF-8 encoding to an ISO/IEC 8859 encoding. That is, the program writes UTF-8, but the provided
      output receives one of the ISO/IEC 8859 encodings. Use the encoding argument to specify the
      desired encoding.
      
 If the data being written to iso8859.writer contains a UTF-8 sequence that cannot be represented in
        the selected encoding, a throw to iso8859.invalid-code-point is triggered.
      
 The following example takes the output of XML processing and converts it to ISO/IEC 8859-8 before sending it
      to the output.
          
import "omff8859.xmd" prefixed by iso8859. process using group "process input" using output as iso8859.writer in iso8859.encoding-8859-8 into #main-output do xml-parse scan file #args[1] output "%c" done group "process input" ; ...
 To use iso8859.writer, you must import OMFF8859 into your program using an import
      declaration such as:
        
import "omff8859.xmd" prefixed by iso8859.