identifiers for package(foo.bar) or null
the visibility
Dsymbol's affected by this AttribDeclaration
Create a new scope if one or more given attributes are different from the sc's. If the returned scope != sc, the caller should pop the scope after it used.
A hook point to supply scope for members. addMember, setScope, importAll, semantic, semantic2 and semantic3 will use this.
Visibility declaration for Dsymbols, e.g. public int i;
<visibility> <decl...> or package(<pkg_identifiers>) <decl...> if pkg_identifiers !is null