[news.eclipse.platform.swt] what is TextContent?

[subin.mdl@xxxxxxxxx (Subin Modeel)]

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protected static final String dummyContent = 
"Just plain text!\n" +
"Now is the time for <b>all</b> good men " + 
"to come to the aid of their country\n" +
"<red><i>To <b>be</b></i> or <i>not to <b>be</b></i>?</red> " + 
"<blue><u>That</u> is the <so>question</so></blue>\n" +
"That's all folks!\n";


TextContent tc = new TextContent(body.getDisplay());
tc.setContent(dummyContent);
styledText.setText(tc.toPlainText());
styledText.setStyleRanges(tc.getStyleRanges());

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I found the above code at
http://www.ibm.com/developerworks/opensource/library/os-jface3/

could anyone please tell me what Textcontent is...and how to use it.
i couldnt find any tutorials on it.
i dont even know which package it comes under.