Abbrevs have properties, some of which influence the way they work.
You can provide them as arguments to
manipulate them with the following functions:
Set the property prop of abbrev to value val.
Return the property prop of abbrev, or
nil if the
abbrev has no such property.
The following properties have special meanings:
This property counts the number of times the abbrev has
been expanded. If not explicitly set, it is initialized to 0 by
nil, this property marks the abbrev as a system abbrev.
Such abbrevs are not saved (see Saving Abbrevs in Files).
nil, this property should be a function of no
arguments which returns
nil if the abbrev should not be used
nil, this property indicates that the case of the
abbrev’s name is significant and should only match a text with the
same pattern of capitalization. It also disables the code that
modifies the capitalization of the expansion.