Question: Melmastia is the requirement by what non-written ethical code which the indigenous Pashtun people follow?

Context articles: List of Pashtuns
Melmastia
Ethical Code of Practice for the Norwegian Press
Khwajgan (Khwaja Khel)
Ethical code
Khong kangjei
Pashtunwali
Pashtunistan
Pashtun culture
Pathans of Kashmir

The following is an incomplete list of notable Pashtuns.
 The list includes those born to parents who are both Pashtuns and those who have mixed Pashtun ancestry.
 Pashtun people are usually defined by speaking the East Iranian dialects of Pashto and related dialects (i.e. Waneci, Wazirwola) as their mother tongue, and/or Practice Pashtunwali (culture); however, there exist many Pashtun communities that assimilated and/or shifted to speaking another language but trace their ancestral roots to Pashtun tribes.
 In several cases, patrilineal lineage is counted for Pashtun ancestry according to Pashtun culture regardless of the mother's line or mixed descent.
 Pashtuns most likely originated as a tribal confederation of people or peoples of proto-Indo-European origin somewhere in Central Asia from which other Indo-Aryan and Iranian peoples may also originate.
Melmastia, or hospitality, is the requirement Pashtunwali places on all its tribesmen towards others, whether they are strangers or members of one's own tribe.
 Melmastia requires hospitality and profound respect to be shown all visitors, regardless of distinctions of race, religion, national affiliation as well as economic status and doing so without any hope of remuneration or favour.
 Pashtuns will go to great extents to show their hospitality.
The Ethical Code of Practice for the Norwegian Press (Bokmål: "Vær Varsom-plakaten" , Nynorsk: "Ver Varsam-plakaten" , Northern Sami: "Leage Várrugas" ) is a code regularing journalism ethics and standards in Norway.
Khwajgan,(Pashto: خواجګان‎ ) also known as Khwaja Khel,(خواجه خېل) is a clan or family of Yusufzai Pashtuns settled in different parts of Swat valley Pakistan i-e in Mingora, Barikot, Charbagh and Dakorak.
 Khwajgan is the title for "the Masters" or "learned people".
 Khwajgan, as the plural for "Khwāja", is often used to refer to a network of Sufis in Central Asia from the 10th to the 16th century.
 In Firdowsi's Shahnama the word is used many times for some rulers and heroes of ancient Iran as well.
 Khwajgan or Khwaja Khel of Swat valley are those who follow Pashtunwali, a non-written ethical code.
Ethical codes are adopted by organizations to assist members in understanding the difference between 'right' and 'wrong' and in applying that understanding to their decisions.
 An ethical code generally implies documents at three levels: codes of business ethics, codes of conduct for employees, and codes of professional practice.
Khong kangjei, also known as mukna kangjei or sometimes kanjei, and commonly known as foot hockey, Manipuri hockey or hockey on foot, is a sport similar to field hockey primarily of the state of Manipur in India.
 It is a game which requires stamina, speed, and agility, and is one of the most popular games in Manipur.
 It is one of the indigenous sports of Manipur, others being sagol kanjei and kang, each of which reflects the martial tradition of Manipur, and with mukna captures an ethical code important to the culture of Manipur.
Pashtunwali (Pashto: پښتونوالی‎ ) or Pakhtunwali is a non-written ethical code and traditional lifestyle which the indigenous Pashtun people follow.
 It is a system of law and governance that is preserved and still in use today, mostly in the rural tribal areas.
 Its meaning may also be interpreted as "the way of the Pashtuns" or "the code of life".
 Pashtunwali is widely practiced among Pashtuns, especially among the non-urbanized Pashtuns in the countryside.
 In addition to being practiced by members of the Pashtun diaspora, it has been adopted by some non-Pashtun Afghans and Pakistanis that live in the Pashtun regions or close to the Pashtuns, who have gradually become Pashtunized over time.
 During the Pashtun-dominated Taliban regime, Pashtunwali was practiced throughout the Islamic Emirate of Afghanistan in conjunction with the Taliban's interpretation of Deobandi Islam.
Pashtūnistān (Pashto: پښتونستان‎ ; also transliterated Pakhtūnistān; lit.
 "homeland of the Pashtuns") is the geographic region inhabited by the indigenous Pashtun people of modern-day Afghanistan and Pakistan, wherein Pashtun culture, language, and national identity have been based.
 Alternative names historically used for the region included ""Afghānistān"" and ""Pashtūnkhwā"", since at least the 3rd century CE onward.
 Pashtunistan borders Punjab to the east, Persian and Turkic speaking regions to the west and north, Kashmir to the northeast, and Balochistan to the south.
Pashtun culture (Pashto: پښتني هڅوب‎ ) is based on Islam and Pashtunwali, which is an ancient way of life, as well as speaking of the Pashto language and wearing Pashtun dress.
 The culture of the Pashtun people is highlighted since at least the time of Herodotus (484-425 BC) or Alexander the Great, when he explored the Afghanistan and Pakistan region in 330 BC.
 The Pashtun culture has little outside influence, and, over the ages, has retained a great degree of purity.
Pathans in Kashmir (also called Kashmiri Pathans) include Pashtun people (Pathans)who still follow Pashtunwali and speak Pashto as their mother-tongue who have settled in the Indian state of Jammu and Kashmir region of South Asia.
 While there are also a large number of Muslims throughout Kashmir who claim Pashtun ancestry through forefathers who migrated to the region under the Afghan rule in Kashmir.
 While exact numbers are hard to determine, cursory estimates put the number of these Pathans or Pashtuns above 100,000.
 Many of these Pathans have over time absorbed Kashmiriyat and use Kashmiri language as their first language , although some people following Pashtunwali customs and aspects of Pashtun culture and Pashto are still notably practiced among the community, but are largely few in number and reside in certain areas only.