@Override
    public Selectable links() {
		throw new UnsupportedOperationException("Links can not apply to plain text. Please check whether you use a previous xpath with attribute select (/@href etc).");
    }
Selectable plain text.<br>
Can not be selected by XPath or CSS Selector.

@author code4crafter@gmail.com <br>
@since 0.1.0
webmagic-core/src/main/java/us/codecraft/webmagic/selector/PlainText.java