Case C-256/14: Judgment of the Court (Eighth Chamber) of 11 June 2015 (request for a preliminary ruling from the Tribunal Arbitral Tributário (Centro de Arbitragem Administrativa — CAAD) — Portugal) — Lisboagás GDL — Sociedade Distribuidora de Gás Natural de Lisboa SA v Autoridade Tributária e Aduaneira (References for a preliminary ruling — Value added tax (VAT) — Directive 2006/112/EC — Articles 9, 73, 78, first paragraph, point (a), and 79, first paragraph, point (c) — Taxable amount — Inclusion of the amount of municipal land use taxes paid by the company holding the concession for the gas distribution network in the taxable amount for VAT applicable to supplies of services made by that company to the company responsible for marketing the gas)