Relationship of international law and municipal law — Conduct of foreign relations — Treaty-making power — Spain — Spanish Constitution, Article 95 — Constitutional review of exercise of treaty-making power — Treaty on European Union, 1992 (“Maastricht Treaty”) — Compatibility with Spanish Constitution

Treaties — Conclusion and operation — Constitutional limitations — Accession of Spain to Treaty on European Union, 1992 — Extension of powers of European Community — Compatibility with Spanish Constitution — Whether special constitutional amendment required prior to ratification — Establishment of right to stand as a candidate in municipal elections for persons resident in one Member State who are nationals of another Member State — Whether violating Article 13(2) of Constitution — Whether constituting an infringement of national sovereignty — Scope of permissible transfer of sovereignty to Community institutions — Article 93 of Constitution — Distinction between transfer of powers to institutions and extension of personal rights

Aliens — Acquisition of citizenship — European Community — Establishment of citizenship of European Union — Effect on nationals of one Member State resident in another Member State — Entitlement of such persons to vote and stand as candidates in municipal elections — The law of Spain