Each must be given a scientifically valid name, usually in Latin or in Greek, that will endure.

WSJ

Among other things, the exchange, which says it handles 80% of all bitcoin trading, said accounts must be verified with a valid photo ID and proof of residence.

WSJ: 'Virtual' Currencies Draw State Scrutiny

Any payments to contractors must be "correct and valid", the report stressed, and only made after proper scrutiny and a broader assessment of what constituted value for money.

BBC: Job centre

The ruling says that 1.1 million signatures might be valid but must be verified by the signers.

CENTERFORSECURITYPOLICY: Hemispheric security watch

Also, the coins must not come into contact with any person and must land within the ring to be valid.

WSJ: Two-Up, A Game Australians Flip Over, Loses Luster When Legalized

The Tax Court emphasized that for professional advice to be valid for penalty purposes, it must be independent.

FORBES: 5 Neglected Tax Developments of 2011

Must be, otherwise no one could have a patent valid in 2012 for something that has been around since 1972.

FORBES: Did Steve Jobs Get That List Scrolling Bounce Back Patent From Atari?

Booking must be completed at least 24 hours in advance and is valid for new reservations only.

FORBES: Tax Day Specials, Promos And Freebies

It also ruled that a vacancy must come into being during a recess in order to be valid.

NPR: Obama To Nominate Package Of Labor Board Members

It is essential that there is a dividing line between the authority of officialdom and players, and Cooper has a valid point when he suggests the latter must not be mishandled.

BBC: Rennie must not face rap

Both must be able to travel from Stansted on the afternoon of Friday 9 June, have valid passports and carry all necessary documents (including visas, if necessary).

BBC: [an error occurred while processing this directive]