I had this problem before as well...if you're using one version of Seam, but the DTD on the site is for a different version, your IDE will give you trouble. Why not version the DTD at the level of granularity of releases (i.e. pages-1.1.5.dtd)? Then when you're using a given version of Seam or pages.xml, you update your DOCTYPE accordingly. For example, the people using 1.1.0 today will get IDE errors. I dunno, just my suggestion anyways... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4015873#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...