Syrian opposition groups are meeting in Madrid to compile a draft political solution to the conflict Al Jazeera reported .
The talks, which entered a second day on Tuesday, include Moaz al-Khatib, who resigned last week as leader of the Syrian National Coalition.
Khatib cited the failure of the international community to stop the conflict as the reason he stepped down.
The Spanish foreign ministry said "various movements" of the opposition to Syria's President Bashar al-Assad were involved in the talks, in addition to the coalition, which is the main opposition bloc.
Pressed back by army advances, Syria's opposition is under international pressure to enter into dialogue with Assad's government.
More than 80,000 people have been killed in the conflict, according to the UN, and 1.5 million people have fled the country since the uprising began in March, 2011.
Among the Madrid meeting's aims is "to facilitate dialogue between the various movements in the Syrian opposition, thereby aiding its cohesion and its future capacity to ensure unity, stability and democracy in Syria," the Spanish foreign ministry said.
"The international effort currently under way to this end requires the forming a strong, unified and diverse opposition capable of representing a common front."
Unity government
Spain in November recognised the coalition as the Syrian people's legitimate representative, along with several Western and Arab powers.
Spanish Foreign Minister Jose Manuel Garcia-Margallo said last month that Madrid backed the formation of a national unity government in Syria as a way out of the two-year conflict.
The participants made no declarations following Monday's talks but the ministry said Khatib was scheduled to meet Garcia-Margallo on Tuesday.
The two would review the situation in Syria and international efforts to settle the conflict, it said.
Before resigning, Khatib had faced criticism of his perceived overly moderate position towards the Assad government.
He was pressured to step down after leading members of the coalition berated him for offering Assad a deal, and after the
bloc went ahead with steps to form a provisional government against Khatib's explicit wishes.
The US and Russia have called an international conference, expected in June, to push for a political solution.
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