Allow users to download CSV aka spreadsheet and reupload to you

See my previous post "Need better way to delete erroneous tags and favorite tags"

Can you allow users to download a spreadsheet/csv file with three columns.
App/website (or however you are recording it at finest level of detail)
Tag (or tags)
Classification (only to make it easier for me to chose my own tags)

Note: if its simpler a separate record for each tag when an app is multiply tagged is fine.

Allow me to manipulate this off-line NOT to change App/website or classification but just to retag the apps using (say) Excel to drag tag's to multiple apps etc.

Probably a separate column where 1 means add and 2 means delete the tagging of an app

I have my apps tagged as:
AppA:tagA, tagB - AppB:tagC - appC-tagA

eg you send me:
appA tagA classA
appA tagB classA
appB tagC classA
appC tagA classB

I send back:
appA tagA classA X
appA tagK classA
appB tagC classA X
appC tagL classB

result after you update is:
AppA:tagB,tagK - AppB:<no> - appC-tagA,tagL

ie. don't touch app-tag combos I don't send back and make requested additions/deletions.

You mentioned in a separate post that XML could "somehow" be acquired by users. If that's a lot easier for you then I could probably generate a syntactically correct XML file to cover above but IMO using CSV would be a lot easier for most

</no>