PRISTINA, Kosovo — Kosovo’s president on Monday said he would respond positively if summoned by a European Union-funded court investigating crimes against ethnic Serbs during and after the 1998-99 independence war with Serbia. At a news conference, Hashim Thaci said that “if there is any invitation at any moment I will respond with full transparency,” and urged others to do the same. The Kosovo Specialist Chambers was set up four years after a 2011 report by the Council of Europe, the continent’s top human rights body, which catalogued allegations of widespread crimes committed by ethnic Albanian members of the Kosovo Liberation Army. Last week the court, based in The Hague, Netherlands, started questioning some former Kosovo fighters.