TUNIS, Tunisia — Tunisia dived into a fierce debate this week over a document that could be an example for the changing Arab world: a long-awaited constitution that will lay out what women are free to do, Islam's role in society and art, and how to share political power after decades of dictatorship.

Differences over how to word the document are already threatening to tear apart the ruling alliance of secular and religious parties that hold Tunisia precariously together, a year and a half after it started the pro-democracy wave of uprisings across the Middle East known as the Arab Spring. Tunisia's experience will be closely watched by the rest of the region.

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