tiles-def.xml in WSAD5.1

Hi all,
I am new to Tiles.. i wrote a simple example using tiles and struts in WSAd5.1.. i haven't found tiles-def.xml in web-inf folder by default... do i need to create one?? if so where do i need to declare that tiles-def.xml is the definitions file for this project?? Plz help
thanx
Lavanya

I created a tiles-def.xml file and added
then i am able to use tiles-def tags..

and then i added the tiles plugin to struts-config.xml

i created a definition in tiles-def.xml like this

when i use this definition in struts-config.xml

It is getting error like "broken link .viewPDS"
do i need to add anymore.or is anything wrong in code..plzzz help

strutsconfig.xml plugin code
<plug-in className="org.apache.struts.tiles.TilesPlugin">
<set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml" />
</plug-in>
strutsconfig.xml action code
<action-mappings>
<action path="/viewPDS" type="org.apache.struts.action.Action">
<forward name="success" path=".viewPDS" contextRelative="false"/>
</action>
</action-mappings>

tiles-def.xml definition code
<definition name=".viewPDS" extends="basic.layout">
<put name="tilte" value="Welcome to View PDS"/>
<put name="content" value="viewPDS.jsp"/>
</definition>

Where's the code?

If the broken link warning is accompanied by a yellow squiggly line in your code, you can probably ignore it and try out your application.

It's common for WSAD to complain about broken links that aren't really broken, especially so in struts-config files.