What does the element do in the following piece of layout XML?
It unsets all elements defined in the layout handle called catalog_seo_sitemap.
It loads the layout handle catalog_seo_sitemap_category into the layout handle ca catalog_seo_sitemap.
It loads the layout handle catalog_seo_sitemap into the layout handle called catalog_seo_sitemap_category.
It updates the name on the layout handle catalog_seo_sitemap_category to catalog_seo_sitemap.
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