if IntelliJ seam tag can not resolve by intelliJ
xmlns:s="http://jboss.com/products/seam/taglib"
which can add-in
<orderEntry type="module-library">
<library>
<CLASSES>
<root url="jar://$MODULE_DIR$/lib/jboss-seam-ui.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES>
<root url="jar://$MODULE_DIR$/lib/src/jboss-seam-ui-sources.jar!/" />
</SOURCES>
</library>
</orderEntry>
in *.iml file
or simply add by
Add the following jars to Project Structure>Modules>Dependencies
jboss-seam-ui.jar
richfaces-ui.jar
xmlns:s="http://jboss.com/products/seam/taglib"
which can add-in
<orderEntry type="module-library">
<library>
<CLASSES>
<root url="jar://$MODULE_DIR$/lib/jboss-seam-ui.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES>
<root url="jar://$MODULE_DIR$/lib/src/jboss-seam-ui-sources.jar!/" />
</SOURCES>
</library>
</orderEntry>
in *.iml file
or simply add by
Add the following jars to Project Structure>Modules>Dependencies
jboss-seam-ui.jar
richfaces-ui.jar