XPath and special characters

I am having an issue with an XPath query I'm performing for a Sitecore CMS system.

This query works fine:

/root/content/Meta-Data/Tips/*

But when I try this:

/root/content/Meta-Data/Tips/*[@SomeAttribute='someke开发者_如何学运维y']

I get an error which says "End of string expected at position 22" which is where the dash character is found. I was under the impression that the dash was not a special character in XML... am I doing something wrong here? Do I need to encode this in some way? Or is this a bug in the XPath parser? Any suggested workarounds?

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Change this:

/root/content/Meta-Data/Tips/*[@SomeAttribute='somekey']

To this:

/root/content/#Meta-Data#/Tips/*[@SomeAttribute='somekey']

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According to the XML spec for characters in tag names, the hyphen should be a valid character. I've done a bit of XPath testing with this site and found it helpful for comparing results with other parsers.