re: [exi] local table miss and global table hit

It is dealt with in the standard: see section 7.3.3 (Partitions Optimized
for Frequent use of String Literals)

If you don't find a certain string in the local table for the current QName,
then you look in the global table. If you find the string in the global
table, then you *don't* add the string to the local table for the current
QName again. Only if the string you are looking for is neither found in the
local nor in the global table, then you add it to the string table (both the
local and global one).

HTH,
Marco