Can you help me in understanding why code 1 works while code 2 not? It seems that it is possible to hide sitemapnodes depending on roles only for nodes which contains nodes inside.

Code 1)

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
    <siteMapNode url="Default.aspx?x=" title="Home" description="Home" >
          <siteMapNode title="A" roles="UserA">
      <siteMapNode url="~/Pages/1.aspx" title="1" />
    </siteMapNode>
    <siteMapNode title="B" roles="UserB">
    <siteMapNode url="~/Pages/2.aspx" title="2" />
    </siteMapNode>
  </siteMapNode>
</siteMap>

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Code 2)

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
    <siteMapNode url="Default.aspx?x=" title="Home" description="Home" >
      <siteMapNode url="~/Pages/1.aspx" title="1" roles="UserA" />
    <siteMapNode url="~/Pages/2.aspx" title="2" roles="UserB" />
  </siteMapNode>
</siteMap>