@@ -314,3 +314,25 @@ def flatten(self, deprel='root'):
314314 for node in self ._children :
315315 node ._parent = self
316316 node ._children .clear ()
317+ 318+ @property
319+ def prev_tree (self ):
320+ """Return the previous tree (root) in the document (from the same zone)."""
321+ doc = self ._bundle ._document
322+ num = self ._bundle .number
323+ if len (doc .bundles ) <= num - 1 or doc .bundles [num - 1 ] is not self ._bundle :
324+ num = doc .bundles .index (self ._bundle ) + 1
325+ if num == 1 :
326+ return None
327+ return doc .bundles [num - 2 ].get_tree (zone = self ._zone )
328+ 329+ @property
330+ def next_tree (self ):
331+ """Return the next tree (root) in the document (from the same zone)."""
332+ doc = self ._bundle ._document
333+ num = self ._bundle .number
334+ if len (doc .bundles ) <= num - 1 or doc .bundles [num - 1 ] is not self ._bundle :
335+ num = doc .bundles .index (self ._bundle ) + 1
336+ if len (doc .bundles ) <= num :
337+ return None
338+ return doc .bundles [num ].get_tree (zone = self ._zone )
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