et-al validation error

I have a
<et-al term="and others" font-style="italic"/>
inside a
<names variable="author">
Like it is said here:
http://citationstyles.org/downloads/specification.html#et-al

but the validator complains about it, saying it not allowed there (please, ignore the other errors, they are easy to solve):

http://validator.nu/?doc=https://raw.githubusercontent.com/allangirao/citacao-coppe/master/citacao-coppe.csl&schema=https://github.com/citation-style-language/schema/raw/v1.0.1/csl.rnc&parser=xml&laxtype=yes

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