Comparing Raw Values of the Age Property

Anshuman Pandey via Unicode unicode at
Mon May 22 17:19:08 CDT 2017

I performed several operations on DerivedAge.txt a few months ago. One basic example here:

If you provide some more insight into your objective, I might be able to help.

I would recommend against relying on the order of the data, and that you instead parse the individual entries to obtain the 'Age' property.

All my best,

> On May 22, 2017, at 4:44 PM, Richard Wordingham via Unicode <unicode at> wrote:
> Given two raw values of the Age property, defined in UCD file
> DerivedAge.txt, how is a computer program supposed to compare them?
> Apart from special handling for the value "Unassigned" and its short
> alias "NA", one used to be able to compare short values against short
> values and long values against long values by simple string
> comparison.  However, now we are coming to Version 10.0 of Unicode,
> this no longer works - "1.1" < "10.0" < "2.0".
> There are some possibilities - the values appear in order in
> PropertyValueAliases.txt and in DerivedAge.txt.  However, I can find no
> relevant guarantees in UAX#44.  I am looking for a solution that can be
> driven by the data files, rather than requiring human thought at every
> version release.  Can one rely on the FULL STOP being the field
> divider, and can one rely on there never being any grouping characters
> in the short values?  Again, I could find no guarantees.
> Richard.
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