def METHOD_NAME(loader: SchemaLoader, is_class: bool) -> Optional[str]:
    """Return the Curie for the schema in loader.  Return None if there is no curie form"""
    prefix = default_curie_or_uri(loader)
    suffix = (
        "camelcase(self.name)"
        if is_class
        else "underscore(self.alias if self.alias else self.name)"
    )
    if ":/" not in prefix:
        return '"' + prefix + ":" + '" + ' + suffix
    else:
        pn = loader.namespaces.METHOD_NAME(prefix, default_ok=False)
        return ('"' + pn + '" + ' + suffix) if pn else None