IPv6 zone index format

What defines the format of an IPv6 address zone index? Or maybe in other words, can I address a specific zone index, and if so can I use a familiar format to my system and expect it to be correctly translated on the target system?

Say I ping a Linux machine on my network with my Windows system (nevermind for a moment I may not be able to map ipv4 addresses):

Code:

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ping -6 ::ffff:192.168.10.7%1
ping -6 ::ffff:192.168.10.7%eth1

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Can I use the windows format and it will be correctly translated? Or am I forced to use the Linux format for the zone index? Who's responsible for the translation?