Sitemap requires that sitemap nodes have unique URLs

Hi i need to build dynamic hierarchy sitemap . Here is my xml

<!--company tab--> <siteMapNode url="~/Module/EB/Company/CompanyList.aspx" title="Company list" description="Company List" > <siteMapNode url="~/Module/EB/Company/CompanyDetail.aspx" title="Company Detail Setup" description="Company Detail Setup" > <siteMapNode url="~/Module/EB/Employee/EmployeeDetail.aspx" title="Employee Detail Setup" description="Employee Detail Setup" > <siteMapNode url="~/Module/EB/Employee/EmployeeDependentDetail.aspx" title="Employee Dependent Setup" description="Employee Dependent Setup" > </siteMapNode> </siteMapNode> </siteMapNode> </siteMapNode> <!--company tab--> <!--Em ...