SwatML for this demo:
<?xml version="1.0" standalone="no"?>
<!DOCTYPE swatml SYSTEM "http://swat.silverorange.com/swatml1.dtd">
<swatml>
<widget class="SwatForm" id="my_form">
<widget class="SwatFormField">
<property name="title">Plain Text Area</property>
<widget class="SwatTextarea" id="textarea" />
</widget>
<widget class="SwatFormField">
<property name="title">XHTML Validating Text Area</property>
<widget class="SwatXHTMLTextarea" id="textarea_xhtml">
<property name="allow_ignore_validation_errors" type="boolean">true</property>
</widget>
</widget>
<widget class="SwatFooterFormField">
<widget class="SwatButton" />
</widget>
</widget>
</swatml>