Use sources_non_forked folder for pathogen path, with sources_non_forked_fallback folder as fallback.

sources_non_forked_fallback/vim-snippets/snippets/xml.snippets

@@ -0,0 +1,12 @@
+# xml declaration
+snippet xml
+	<?xml version="1.0" encoding="UTF-8"?>
+# tag
+snippet t
+	<${1:}>
+		${2}
+	</$1>
+# inline tag
+snippet ti
+	<${1:}>${2}</$1>
+