Is there a way to set a static enum type list, maybe as a simpleType, in an XML Schema?

So if this is the structure:

<Vault>
<Local>
<Title><\Title>
<Catergory><\Catergory>
<Platform><\Platform>
<\Local>
<\Vault>

I want to have Platform and Catergory be values from a list. It thought that it'd be nice to tie that into the schema, but don't know how.