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The following page has been changed by PeterMonks:
http://wiki.apache.org/couchdb/How_to_store_hierarchical_data

The comment on the change is:
Attempted to clarify the text concerning UUID / numeric _ids.

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- In a real system you'd probably want to use some sort of UUID instead of 
descriptive strings, since conflicts between node names could be bad. In fact, 
it'd probably be much faster to just use numbers, since comparisons on numbers 
are generally much faster. For the purposes of this example, however, it's much 
easier to understand if it's descriptive text.
+ In a real system you'd probably want to use some sort of UUID for the _id 
field rather than descriptive strings, since conflicts between node names could 
be bad. In fact, it'd probably be much faster to just use numbers, since 
comparisons on numbers are generally much faster. For the purposes of this 
example, however, it's much easier to understand if the _id is descriptive 
text.  For the purposes of displaying the path for a particular document, 
however, it will generally be easier to store (at least) the descriptive name 
of each path element in the path array, as shown here.
  
  Once that data is in your DB, it's time to get it out again!
  

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