Can instanceVariables be used when using tags in Pharo Smalltalk?
Trait named: #Personnel uses:{} category: 'Test'
and I would like to add some variables that other classes can use from these attributes. Is this possible in Smalltalk?
No. Traits are constituent units, which simply means: no attributes, just methods.
For a more detailed explanation, you can take a look at: http://scg.unibe.ch/archive/papers/Scha03aTraits.pdf