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[still no way to] extend curated data?

• To: mathgroup at smc.vnet.net
• Subject: [mg94470] [still no way to] extend curated data?
• From: congruentialuminaire at yahoo.com
• Date: Sun, 14 Dec 2008 07:38:10 -0500 (EST)

Hello MathGroup:

Is this still true? I have been searching 'paclets' and 'curated data'
in this group to no avail [yet].

I basically want to add custom attributes to the curated data, so I
want to do something like:

In[1]=ElementData["Carbon","AtomicMass"]
Out[1]=12.0107
In[2]=ElementData["Carbon","AtomicMass","Description"]
Out[2]=Isotopic abundance-weighted average atomic mass.
In[3]=ElementData["Carbon","UsedInMyExperiments"]
Out[3]=True

This seemed to work:

Append[ElementData["Properties"], "UsedInMyExperiments"]

But, this gets a set-write error:

ElementData["Carbon", "UsedInMyExperiments"] = True

I guess I need to "wrap" or extend ElementData[].

Any pointers describing how to approach this is greatly appreciated.

Regards..

Roger Williams
Franklin Laboratory