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>	The canvas makes extensive use of the Gtk object argument
	system &#8212; all the items' attributes are configured and
	queried through it.  You only need to have only a minimal
	knowledge of how the argument system works, so do not worry if
	you do not want to learn all the details.  Here we will
	explain everything you need to know.
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>	Using the Gtk argument system to to configure and query the
	canvas item arguments has the advantage of making it easy for
	language bindings to do their job, and it also avoids having
	many API entry points for all the canvas items.
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