[property_tree] Conversion constructor missing?

Imagine you have this XML structure (copied from the documentation and  
shortened):

<debug>
     <modules>
         <module>Finance</module>
         <module>Admin</module>
         <module>HR</module>
     </modules>
</debug>

Now imagine you have this function which you want to call three times to  
pass the <module>...</module> nodes to:

void foo(boost::property_tree::ptree pt);

You can use get_child("debug.modules") to retrieve a property tree  
containing all module nodes. However if you iterate over the property tree  
the iterator refers to std::pair<const key_type, basic_ptree<Tr>> - and  
there is no simple way to convert this pair to a new property tree. You  
must create an empty property tree followed by a call to push_back() to  
insert the pair. Either there is a conversion constructor missing or I  
miss something and there is a simpler way of what I'm trying to do?

Boris

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