Is there something similar to a skin file in visual studio where the properties of the "skin" file are only applied if they do not exist in the tag. So, if I have a skin file:
<p class="myClass">
And two tags:
<p class="someClass">HelloWorld</p>
<p>HelloWorld</p>
I want the "skin" file to add the class "myClass" only to the second paragraph tag. Is this possible?