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messages.pl -- Run goals that produce messages
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This module allows executing (long running) Prolog goals and see the messages appear in the browser.

Source call_showing_messages(:Goal, +Options) is det
Execute Goal, showing the feedback in the browser. This predicate builds a default application page with a placeholder for the messages. It then sends all HTML upto the placeholder and flushes the output to the browser. During execution, all output from Goal emitted through print_message/2 is caught in the message-box. After completion of Goal the page is completed.

This predicate is intended for action such as loading RDF files, while providing feedback on files loaded and possible error messages. Note that this call creates a complete page.

- This call uses chunked transfer encoding to send the page in parts. Not all browsers support this and not all browsers update the page incrementally.