因为表单可以将Schematron文档本身作为实例数据使用，所以可以将控件绑定到Schematron文档中的节点。
Since the Schematron document itself is made available to the form as instance data, you're free to bind controls to nodes in the Schematron document.
创建控件更简单的办法是从实例数据中选择节点，拖放到设计画布的空白区域。
An even easier way to create a control is to select a node in your instance data and drag it onto an empty area in the design canvas.
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