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From Lua docs about colon (:) usage on strings:

The string library provides all its functions inside the table string. It also sets a metatable for strings where the __index field points to the string table. Therefore, you can use the string functions in object-oriented style. For instance, string.byte(s, i) can be written as s:byte(i).

Short example for objects:

Code:

obj = grp.find('1/1/1')

-- both lines do exactly the same thing
obj:write(false)
grp.write(obj.address, false, obj.datatype)