[Orgmode] tag or property names with dashes

[Ilya Shlyakhter]

When doing an agenda tags match for tags or properties with dashes in
their name,
the dashes become negation operators: "my-prop>0" means "entries that
have the tag
'my' and do not have a positive property 'prop'", rather than "entries
that have a positive
property 'my-prop'".  Is there a way to escape the dashes to get the
latter meaning?

thanks,

ilya