[Zope] Ordered list

[Marcio Moreira]

Hello Friends,

I´m working on a vegetal species catalog. I´ve created a Z class for species, so
I will have one instance of such class for every plant. In this class I have a
property for "popular names" of the species (names people knows that plant by).
This property is "lines" type.

I need two listings: 
One for scientific names (easy to get since I use the class ID
for the scientific names - they don´t repeat). 

The other listing is for popular names.
I used "lines" type for it because every plant use to have diferent popular names in diferent regions of the country.

My question is: How can I have an ordered listing of all popular names of all
plants (in other words, how can I have an ordered listing of data stored in "lines"-type properties on diferent class instances)?

Thanks in advance,
Marcio Moreira

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