Class (knowledge representation)

In knowledge representation, a class is a collection of individuals or objects. A class can be defined either by extension, or by intension, using what is called in some ontology languages like OWL. If we follow the Type–token distinction, the ontology is divided into individuals, who are real worlds objects, or events, and types, or classes, who are sets of real world objects. Class expressions or definitions gives the properties that the individuals must fulfill to be members of the class. Individuals that fulfill the property are called Instances.

Relationships

Instantiation

The instantiation relationship is a relation between objects and classes. We say that an object O, say Harry the eagle is an instance of a class, say Eagle. Harry the eagle has all the properties that we can attribute to an eagle, for example his parents were eagles, he's a bird, he's a meat eater and so on. It's a special kind of is a relationship. It's noted Concept assertion () in Description logics, a family of logic based on classes, class assertion

Doctor Who

Doctor Who is a British science-fiction television programme produced by the BBC from 1963 to the present day. The programme depicts the adventures of the Doctor, a Time Lord—a space and time-travelling humanoid alien. He explores the universe in his TARDIS, a sentient time-travelling space ship. Its exterior appears as a blue British police box, which was a common sight in Britain in 1963 when the series first aired. Accompanied by companions, the Doctor combats a variety of foes, while working to save civilisations and help people in need.

The show is a significant part of British popular culture, and elsewhere it has become a cult television favourite. The show has influenced generations of British television professionals, many of whom grew up watching the series. The programme originally ran from 1963 to 1989. There was an unsuccessful attempt to revive regular production in 1996 with a backdoor pilot, in the form of a television film. The programme was relaunched in 2005 by Russell T Davies, who was showrunner and head writer for the first five years of its revival, produced in-house by BBC Wales in Cardiff. The first series of the 21st century featured Christopher Eccleston in the title role and was produced by the BBC. Series two and three had some development money contributed by the Canadian Broadcasting Corporation (CBC), which was credited as a co-producer.Doctor Who also spawned spin-offs in multiple media, including Torchwood (2006–2011) and The Sarah Jane Adventures (2007–2011), both created by Russell T Davies; K-9 (2009–2010); and a single pilot episode of K-9 and Company (1981). There also have been many spoofs and cultural references to the character in other media.

Class (computer programming)

In object-oriented programming, a class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions or methods). In many languages, the class name is used as the name for the class (the template itself), the name for the default constructor of the class (a subroutine that creates objects), and as the type of objects generated by instantiating the class; these distinct concepts are easily conflated.

When an object is created by a constructor of the class, the resulting object is called an instance of the class, and the member variables specific to the object are called instance variables, to contrast with the class variables shared across the class.

In some languages, classes are only a compile-time feature (new classes cannot be declared at runtime), while in other languages classes are first-class citizens, and are generally themselves objects (typically of type Class or similar). In these languages, a class that creates classes is called a metaclass.

Hello (Adele song)

"Hello" is a song by English singer Adele. It was released on 23 October 2015 by XL Recordings as the lead single from her third studio album, 25 (2015). Adele co-wrote the song with her producer, Greg Kurstin. "Hello" is a piano ballad with soul influences, and lyrics that discuss themes of nostalgia and regret. Upon release, the song was well received by music critics, who compared it favourably to Adele's previous work and praised the song's lyrics and Adele's vocals.

"Hello" attained international commercial success reaching number one in almost every country it charted in, including the United Kingdom, where it became her second UK number-one single, following "Someone like You", and has the largest opening week sales in three years. In the United States, "Hello" debuted atop the Billboard Hot 100, becoming Adele's fourth number-one on the chart and breaking several records, including becoming the first song to sell over a million digital copies in a week.

The accompanying music video was directed by Xavier Dolan and co-stars Adele and Tristan Wilds. The music video for the song broke the Vevo Record by achieving over 27.7 million views within a 24-hour span, held previously by Taylor Swift's "Bad Blood" which accumulated 20.1 million views in that timeframe. It also broke the record for shortest time to attain 100 million Vevo views, previously held by Miley Cyrus' "Wrecking Ball", as well as shortest time to reach 1 billion YouTube views (88 days). Adele promoted the song with a live performance on a BBC one-hour special, entitled Adele at the BBC.

Hell-O (Glee)

"Hell-O" is the fourteenth episode of the American television series Glee. The episode premiered on the Fox network on April 13, 2010. It was written by series creator Ian Brennan and directed by Brad Falchuk. In "Hell-O", cheer-leading coach Sue Sylvester (Jane Lynch) attempts to sabotage the relationship between glee club members Finn Hudson (Cory Monteith) and Rachel Berry (Lea Michele). Glee club director Will Schuester (Matthew Morrison) attempts to begin a relationship with school guidance counsellor Emma Pillsbury (Jayma Mays), but several obstacles come between them, including the coach of rival glee club Vocal Adrenaline.

"Hell-O" introduces special guest stars Idina Menzel as Shelby Corcoran, the coach of Vocal Adrenaline, and Jonathan Groff as Jesse St. James, the group's lead singer. Glee fans had previously lobbied for Menzel to be cast as Rachel's biological mother. The episode features cover versions of six songs, five of which were released as singles, available for digital download.

Hello (2008 film)

Hello is a 2008 Bollywood thriller film directed by Atul Agnihotri, starring Sharman Joshi, Sohail Khan, Gul Panag, Isha Koppikar, Amrita Arora and Sharat Saxena in the lead roles. The film is based on Chetan Bhagat's novel, One Night @ the Call Center. It also had cameo roles from Salman Khan who plays himself and Katrina Kaif who plays an angel of god in the film. It was released on 10 October 2008. Hello had an 'Average' performance at Indian box-office.

Plot