The new constitution being debated this weekend by Cuban legislators would provide a legal path for same-sex marriage, an important demand of the socialist island's LGBT community.
The document's Article 68 would define marriage as the "voluntary and consensual union between two people" without specifying their biological sex, the official newspaper Granma said Saturday, reporting on National Assembly debates over the proposed changes in Cuba's basic law.
The current constitution, dating from 1976, limits marriage to the "voluntary union of a man and a woman."
The change would "open the door to legalizing homosexual couples for all posterity," Francisco Rodriguez, a journalist and well-known gay activist who is also a member of the governing Communist Party, wrote in his blog.
By incorporating "the principle of non-discrimination based on sexual orientation and gender identity," the new wording could facilitate other legal and policy changes to protect the island's LGBT community, he said.
Still, Rodriguez warned that "the fight ahead will not be easy." Certain political and ideological forces will "do everything possible to wreck these dreams," he said.
For more than a decade, the lawmaker Mariela Castro, daughter of former president Raul Castro, has promoted LGBT rights.
In the early days of the 1959 revolution, gays were persecuted in Cuba, even sent to forced labor "re-education" camps.
Mariela Castro, as director of the Cuban National Center for Sex Education, has long advocated for same-sex marriages.
"Giving rights to those who lack them does not imply taking them from those who already have them," she said in a parliamentary debate broadcast on local television on Friday.
But another lawmaker, while applauding the move to same-sex marriage rights, expressed concerns about gay couples adopting children.
The proposed changes do not specifically address that issue.
The National Assembly is to vote on the new constitution, prepared by a parliamentary commission under Raul Castro and President Miguel Diaz-Canel, between now and Monday. It will then be submitted to a popular referendum for final approval.
The document has also drawn attention for recognizing the free market and private property, while encouraging foreign investment.
Cuban officials say they have found one of the two black boxes from a plane that crashed near Havana airport, killing more than 100 people, in "good condition".
Transport Minister Adel Yzquierdo says he hopes the second device will be recovered soon.
He revised the official death toll up to 110 people, including 11 foreigners.
Three women survived the crash, but are said to be in a critical condition with serious burns.
The incident is Cuba's worst air disaster in decades, and two days of national mourning began on Saturday.
Officials said investigators are combing through the wreckage of the plane, a Boeing 737 which was nearly 40 years old, at the field where it crashed some 20km (12 miles) south of the Cuban capital.
The black box which has already been recovered will hold key flight data and information about what happened to the plane.
Mr Yzquierdo told journalists that the 110 dead included 99 Cubans, six Mexican crew members, two tourists from Argentina, one from Mexico, and two passengers from Western Sahara.
The Argentine couple were named by their government as Dora Beatriz Cifuentes and Oscar Hugo Almaras, both in their sixties.
Several victims' relatives have travelled to Havana to help identify the deceased.
Image copyrightAFP/GETTY IMAGESImage captionThe first secretary of Communist Party in Holguín comforts relatives of the crash victims
Those coming from Holguín - the plane's intended destination - and other eastern parts of Cuba made the 700km (435-mile) trip on buses, escorted by the National Revolutionary Police, EFE news agency reported.
President Miguel Diaz-Canel has visited the morgue where the victims are being identified.
Cuban authorities do not plan to release the full list of the dead until all victims' families have been informed.
How did the plane come down?
The Boeing 737-201 crashed at 12:08 (16:08 GMT) on Friday, shortly after taking off from Havana on an internal flight to Holguín.
It's too early to say what caused the crash, but eyewitnesses on the ground described seeing the jet burst into flames before crashing into a field close to a wooded area near the airport.
Image copyrightREUTERSImage captionWreckage was spread over a large area
"I saw it taking off," supermarket worker Jose Luis told the AFP news agency. "All of a sudden, it made a turn, and went down. We were all amazed."
"We heard an explosion and then saw a big cloud of smoke go up," Gilberto Menendez, who runs a restaurant near the crash site, told Reuters.
Mexico's transport department said on its website that "during take-off (the plane) apparently suffered a problem and dived to the ground".
Boeing said that it was ready to send a technical team to Cuba, "as permitted under US law and at the direction of the US National Transportation Safety Board and Cuban authorities".
A US trade embargo has been in force against Cuba for many decades.
What about the survivors?
Four people initially survived the crash but one died after being taken to hospital, the director of Havana's Calixto Garcia hospital, Carlos Alberto Martinez, told Reuters.
The three survivors are all women, according to Cuban Communist Party newspaper Granma: one aged between 18 and 25, one in her thirties and the third aged 39.
Image copyrightAFP/GETTY IMAGESImage captionA survivor of the plane crash attended by emergency workers
"She is alive but very burnt and swollen," one of the women's relatives at the hospital told Reuters.
Analysis: Grieving public demand answers
By Will Grant, BBC Cuba Correspondent
Two days of national mourning have begun, with the entire island sharing a little of the pain of the many families affected by the disaster. But in their grief, people also want answers. They are demanding an explanation as to why a routine flight from Havana came crashing down in a field barely a minute after it took off, with over 100 passengers and crew on board.
The country's new President, Miguel Diaz-Canel, faces his first real test in providing those answers. He visited the crash site to thank the emergency services and announced an investigation was already under way.
Image copyrightAFP/GETTY IMAGESImage captionFlags are flying at half-mast in Cuba as the island grieves the disaster
It emerged that the previous President, Raúl Castro, was recuperating from minor surgery on a hernia, and he too expressed his condolences to the victims' families.
The families of the survivors face an anxious wait to see if they will pull through, and their countrymen are praying that at least some will have survived this catastrophe.
What do we know about the plane?
The plane had been leased to state airline Cubana de Aviación by the Mexican company Aerolineas Damojh.
The Mexican authorities said the plane was built in 1979 and had been successfully inspected last November. Mexico earlier said it was sending two civil aviation specialists to join the investigation.
Aerolineas Damojh, also known as Global Air, has three planes in operation.
Image copyrightREUTERSImage captionCrowds of shocked onlookers gathered at the crash site
Last month, a military plane crashed shortly after take-off in Algeria, killing more than 250 people
In February, a Saratov Airlines plane crashed near Moscow, killing 71 people
In March, a US-Bangla Airlines flight crashed in Kathmandu, Nepal; 51 people died
Cuba's deadliest air crash was in 1989, when a Soviet-made Ilyushin-62M passenger plane crashed near Havana, killing 126 people on board and another 24 people on the ground.
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