access data LinkedHashMap.LinkedHashMap

Hi,
i would like access to this class Java (resultSet of Smooks):

List
   -LinkedHashMap (in position 0 of List)
        -LinkedHashMap 

How may0 access this structure by Freemaker?
I tryed with this template, but nothing.

<#list trRS[0] as keys>
<#list keys as keys2> ${keys[keys2]} -->retrieve the value of child
LinkedHashMap
</#list>--> for ciclyng keys of child LinkedHashMap!!!
</#list>--> for ciclyng keys of my first LinkedHashMap!!!

trRS is my List.
trRS[0] is my first LinkedHashMap...here freemakers throw error:

Expected collection or sequence. trRS[0] evaluated instead to
freemarker.template.SimpleHash on line 2, column 24 in free-marker-template.
The problematic instruction:
----------
==> list trRS[0] as keys [on line 2, column 17 in free-marker-template]
----------

Java backtrace for programmers:
----------
freemarker.template.TemplateException: Expected collection or sequence.
trRS[0] evaluated instead to freemarker.template.SimpleHash on line 2,
column 24 in free-marker-template.
	

Thanks for your help!!!I hope.
 



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