How do I order index?

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VB

ASP.NET

XML

LINQ

I have many xml files. I want bound them each by each.


Samples of my xml files like these

<Brands TopCategory="Categories" SubCategory="Models">
  <Brand Id="0" Name="Brand1" />
  <Brand Id="1" Name="Brand2" />
</Brands>

<Models TopCategory="Brands" SubCategory="Products, Features">
  <Model Id="0" Name="Model1" />
  <Model Id="1" Name="Model2" />
</Models>

<Products TopCategory="Models" SubCategory="-1">
  <Product Id="0" Name="Product1" />
  <Product Id="1" Name="Product2" />
</Products>

<Features TopCategory="Models" SubCategory="Features1, Features2">
  <Feature Id="0" Name="Feature1" />
  <Feature Id="1" Name="Feature2" />
</Features>

<Features1 TopCategory="Features" SubCategory="-1">
  <Feature Id="0" Name="Feature1" />
  <Feature Id="1" Name="Feature2" />
</Features>

<Features2 TopCategory="Features" SubCategory="-1">
  <Feature Id="0" Name="Feature1" />
  <Feature Id="1" Name="Feature2" />
</Features>

I want order like these

Index1 = {"Brands", "Models", "Products", "-1"}
Index2 = {"Brands", "Models", "Features", "Features1", "-1"}
Index3 = {"Brands", "Models", "Features", "Features2", "-1"}

If sub category have "-1" then must finish indexing

What I have tried:

How can i create index order? do you have any sugsesstion?
Thanks