conditional element content?

Hello,

Just a small question.
Would it be possible to specify that an element's content can change
conditionally, in
relation with an attribute's value?
eg.
<element name="test" type="true">
<h1/>
</element>

<element name="test" type="false">
<h1/>
<h2/>
</element>
Would this be done with XSLT?

Best,

Vaios