How to set default page layout

i have created a site definition, when creating a subsite my layout that i want to use dont get setted? How can i set my own default page layout when creating a subiste? Here is my onet.xml

Doing like this dont change my default publishing page layout

<Modules>
<Module Name="MyDef" Url="$Resources:osrvcore,List_Pages_UrlName;" Path="">
  <File Url="default.aspx" >
    <Property Name="Title" Value="$Resources:cmscore,IPPT_HomeWelcomePage_Title;" />
    <Property Name="PublishingPageLayout" Value="~SiteCollection/_catalogs/masterpage/FSF_Avdelningsplats_Elmia.aspx, $Resources:cmscore,PageLayout_WelcomeLinks_Title;" />
    <Property Name="ContentType" Value="$Resources:cmscore,contenttype_welcomepage_name;" />
  </File>
</Module>