Get information about the 'locality' of a file content provider.
The returned information can be used to chose the 'best' among a
number of file content providers implementing this interface.
Parameter BaseURL
the base (file) URL used to specify a file content provider.
Returns
an appropriat value representing the 'locality' of the specified file
content provider. Generally, higher (non-negative) numbers denote
file content providers that are more 'local', and negative numbers
denote content providers that are not file content providers at all.
As a convention (and to keep this useful), values should be restricted
to the range from -1 to +10, inclusive.