BEIJING (Reuters) - Four years ago in Mexico, China's new president provided a rare glimpse of a leader who was born into a revolutionary aristocracy and came of age in the tumult of Mao Zedong's Cultural Revolution.
On Thursday, Xi Jinping sported the dark suit and cautious public mask that is the uniform of the party leadership as he took his place as the head of state after delegates to China's rubber stamp parliament voted him in almost unanimously at the cavernous Great Hall of the People.
But in Mexico, Xi dropped his guard in a steely defence of his country against criticism from abroad.
"In the midst of international financial turmoil, China was still able to solve the problem of feeding its 1.3 billion people, and that was already our greatest contribution to humankind," he said in comments that drew applause from Chinese Internet users.
"Some foreigners with full bellies and nothing better to do engage in finger-pointing at us," he went on. "First, China does not export revolution; second, it does not export famine and poverty; and third, it does not mess around with you. So what else is there to say?"
Xi assumed the role of Communist Party and military chief from Hu Jintao in November at a key party congress, and has now completed his rise to the top, replacing incumbent Hu Jintao.
Xi has crafted a low-key, sometimes bluff political style. He has complained of officials' speeches and writings being clogged with party jargon and demanded more plain speaking.
Since November, he has waged a campaign against corruption and excess, responding to widespread public anger that party members are both above the law and wasteful.
"The style in which you work is no small matter, and if we don't redress unhealthy tendencies and allow them to develop, it will be like putting up a wall between our party and the people, and we will lose our roots, our lifeblood and our strength," Xi told a meeting of the party's top anti-graft body in January.
Xi, 59, is the son of reformist former vice premier and parliament vice-chairman Xi Zhongxun, making him a "princeling" - one of the privileged sons and daughters of China's incumbent, retired or late leaders.
He grew up among the party elite and then watched his father purged from power before the 1966-76 Cultural Revolution, when Xi himself spent years in the poverty-stricken countryside before scrambling to university.
Considered a cautious reformer, having spent time in top positions in the coastal Fujian and Zhejiang provinces, both at the forefront of China's economic reforms, Xi had long been marked out as the likely successor to Hu.
Married to a famous singer and briefly in charge of Shanghai, China's richest and most glamorous city, Xi unsettled Chinese people and the foreign business community alike when he vanished from public without explanation for about two weeks in September, prompting feverish rumours of serious illness and a troubled succession.
Sources said Xi hurt his back while swimming and that he had been obeying doctors' orders to get bed rest and undergo physiotherapy.
Xi went to work in the poor northwest Chinese countryside as a "sent-down youth" during the chaos of the Cultural Revolution, and became a rural commune official.
He studied chemical engineering at Tsinghua University in Beijing, an elite school where Hu also studied. Xi later gained a degree in Marxist theory from Tsinghua and a doctorate in law.
Xi shot to fame in the early 1980s as party boss of a rural county in Hebei province, which surrounds Beijing. He had rare access to then national party chief Hu Yaobang in the leadership compound, Zhongnanhai, west of the Forbidden City.
A native of the remote, inland province of Shaanxi, home of the terracotta warriors, Xi was promoted to governor of the southeastern province of Fujian in August 1999 after a string of provincial officials were caught up in a graft dragnet.
In March 2007, the tall and portly Xi secured the top job in China's commercial capital, Shanghai, when his predecessor, Chen Liangyu, was caught up in another huge corruption case. Seven months later, Xi was promoted to the party's Standing Committee - the ruling inner-circle.
Xi is married to Peng Liyuan, a renowned singer who was once arguably more popular in China than her husband, until the party began ordering her to keep a low profile as her husband moved up the ranks. (Additional reporting by Sui-Lee Wee; Editing by Ian Geoghegan)
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