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+====== root.Documents ======
+===== Motivation =====
+The reason why I wanted this method is to have an additional interface to access already loaded documents (from within scripts) without being given there handles. The method closely works together with the [[root.Document]] method--please also read this page...
+===== Method reference ('root.Help('Documents')') =====
+<file> ROOT::Documents  - get list of "Documents" (VB-Style interface)
+ FORMAT:       [docs, doct] = xff.Documents([type]);
+ Input fields:
+       type        if given, must be one of the valid 3/4 char types
+                   or a regexpi list of types '(ext1|ext2|ext3)'
+ Output fields:
+       docs        currently loaded documents
+       doct        file types of loaded documents</file>
+===== Examples =====
+To get a list of handles to all documents currently loaded by the xff class, a call without arguments can be used:
+<code matlab xff_root_documents_all.m>% get root object handle
+root = xff;
+% get handles to all documents
+handles = root.Documents;</code>
+To further restrict the selection, you can give one extension, such as vmr:
+<code matlab xff_root_documents_vmrs.m>% get root object handle
+root = xff;
+% get handles to all VMR documents
+vmrs = root.Documents('vmr');</code>
+And to get documents of one of several types, a regular expression can be used:
+<code matlab xff_root_documents_maps.m>% get root object handle
+root = xff;
+% get handles to all statistical objects
+stats = root.Documents('(glm|vmp)');</code>