"It is a core issue of free speech," Mr. Guzofsky said.
"I don't think the exploitation of resources of Congo is a core issue," he said.
The fate of the site is a core issue at the heart of the conflict between Israel and the Palestinians.
It was, he said, "about mutual respect and trust, and that is a core issue that is central to resolving this".
"The issue of women and girls, and body issues and self-esteem, is a core issue of mine," she told the Guardian.
"I am very interested that the [Belgian] trial starts because my innocence is a core issue," he told a news conference.
"Getting distribution, getting noticed, is a core issue, but that's a situation that will always face independent filmmaking but technology is working in its favour as you can deliver a film in so many different ways.
The Israeli-Palestinian conflict has long been a core issue for the Labour party, and a leader who is more openly critical of Israel than his predecessors may well lose support among those backing a very rightist Israel.
"It's a core issue for me," says Perkins. "Qualifying as European content has an impact on the value of our films, especially in regard to French and German TV.
In their meeting on Wednesday afternoon, Prime Minister Li Keqiang of China told Mr. Netanyahu that "the Palestinian issue is a core issue affecting the peace and stability of the Middle East, and a peaceful solution reached through dialogue and negotiations is the only effective answer," according to Xinhua, the state news agency.
