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@wking
Created June 2, 2017 21:55
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Values SHOULD conform to the following grammar (specified in [XML 1.0's EBNF][ebnf]):
```
ref ::= component ("/" component)*
component ::= alphanum (separator alphanum)*
alphanum ::= [a-zA-Z0-9]+
separator ::= [-._:@+] | "--"
```
[ebnf]: https://www.w3.org/TR/REC-xml/#sec-notation
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