<Layer> <Title>Root Layer Name</Title> ...
<Layer> <Title>Groupe/Theme Name</Title> ...
<Layer> <Title>Layer 1</Title> ... </Layer>
<Layer> <Title>Layer 2</Title> ... </Layer>
<Layer> <Title>Layer 3</Title> ... </Layer>
</Layer>
<Layer> <Title>Groupe/Theme Name</Title> ...
<Layer> <Title>Layer 1</Title> ... </Layer>
<Layer> <Title>Layer 2</Title> ... </Layer>
</Layer>
</Layer>
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