Транслитерация деванагари: системы и стандарты

Transliteration from Devanāgarī to the Latin alphabet

Devanagari is an Indic script used for many Indo Aryan languages of North India and Nepal, including Hindi, Marathi and Nepali, which was the script used to write Classical Sanskrit. There are several somewhat similar methods of transliteration from Devanagari to the Roman script (a process sometimes called romanisation), including the influential and lossless IAST notation. Romanised Devanagari is also called Romanagari.

The International Alphabet of Sanskrit Transliteration (IAST) is a subset of the ISO 15919 standard, used for the transliteration of Sanskrit, Prakrit and Pāḷi into Roman script with diacritics. IAST is a widely used standard. It uses diacritics to disambiguate phonetically similar but not identical Sanskrit glyphs. For example, dental and retroflex consonants are disambiguated with an underdot: dental द=d and retroflex ड=ḍ. An important feature of IAST is that it is losslessly reversible, i. e., IAST transliteration may be converted back to correct Devanāgarī or to other South Asian scripts without ambiguity. Many Unicode fonts fully support IAST display and printing.

The Hunterian system is the "national system of romanisation in India" and the one officially adopted by the Government of India. The Hunterian system was developed in the nineteenth century by William Wilson Hunter, then Surveyor General of India. When it was proposed, it immediately met with opposition from supporters of the earlier practiced non systematic and often distorting "Sir Roger Dowler method" (an early corruption of Siraj ud Daulah) of phonetic transcription, which climaxed in a dramatic showdown in an India Council meeting on 28 May 1872 where the new Hunterian method carried the day. The Hunterian method was inherently simpler and extensible to several Indic scripts because it systematised grapheme transliteration, and it came to prevail and gain government and academic acceptance. Over time, the Hunterian method extended in reach to cover several Indic scripts, including Burmese and Tibetan. Provisions for schwa deletion in Indo Aryan languages were also made where applicable, e. g. the Hindi कानपुर is transliterated as kānpur (and not kānapura) but the Sanskrit क्रम is transliterated as krama (and not kram). The system has undergone some evolution over time. For instance, long vowels were marked with an accent diacritic in the original version, but this was later replaced in the 1954 Government of India update with a macron. Thus, जान (life) was previously romanised as ján but began to be romanised as jān. The Hunterian system has faced criticism over the years for not producing phonetically accurate results and being "unashamedly geared towards an English language receiver audience."

The National Library at Kolkata romanisation, intended for the romanisation of all Indic scripts, is an extension of IAST. It differs from IAST in the use of the symbols ē and ō for ए and ओ (e and o are used for the short vowels present in many Indian languages), the use of 'ḷ' for the consonant (in Kannada) ಳ, and the absence of symbols for ॠ, ऌ and ॡ.

A standard transliteration convention not just for Devanagari, but for all South Asian languages was codified in the ISO 15919 standard of 2001, providing the basis for modern digital libraries that conform to International Organization for Standardization (ISO) norms. ISO 15919 defines the common Unicode basis for Roman transliteration of South Asian texts in a wide variety of languages/scripts. ISO 15919 transliterations are platform independent texts so that they can be used identically on all modern operating systems and software packages, as long as they comply with ISO norms. This is a prerequisite for all modern platforms so that ISO 15919 has become the new standard for digital libraries and archives for transliterating all South Asian texts. ISO 15919 uses diacritics to map the much larger set of Brahmic graphemes to the Latin script. The Devanagari specific portion is nearly identical to the academic standard, IAST: "International Alphabet of Sanskrit Transliteration", and to ALA LC, the United States Library of Congress standard. Another standard, United Nations Romanization Systems for Geographical Names (UNRSGN), was developed by the United Nations Group of Experts on Geographical Names (UNGEGN) and covers many Brahmic scripts. There are some differences between ISO 15919 and UNRSGN.

Compared to IAST, Harvard Kyoto looks much simpler. It does not contain any of the diacritic marks that IAST contains. Instead of diacritics, Harvard Kyoto uses capital letters. The use of capital letters makes typing in Harvard Kyoto much easier than in IAST but produces words with capital letters inside them.

The disadvantage of the above ASCII schemes is case sensitivity, implying that transliterated names may not be capitalised. This difficulty is avoided with the system developed in 1996 by Frans Velthuis for TeX, loosely based on IAST, in which case is irrelevant.

WX notation is a transliteration scheme for representing Indian languages in ASCII. This scheme originated at IIT Kanpur for computational processing of Indian languages, and is widely used among the natural language processing (NLP) community in India. The notation (though unidentified) is used, for example, in a textbook on NLP from IIT Kanpur. [1] The salient features of this transliteration scheme are: Every consonant and every vowel has a single mapping into Roman. Hence it is a prefix code,[2] advantageous from a computation point of view. Typically the small case letters are used for un aspirated consonants and short vowels while the capital case letters are used for aspirated consonants and long vowels. While the retroflexed voiceless and voiced consonants are mapped to 't, T, d and D', the dentals are mapped to 'w, W, x and X'. Hence the name of the scheme "WX", referring to the idiosyncratic mapping. Ubuntu Linux provides a keyboard support for WX notation.

SLP1 (Sanskrit Library Phonetic) is a case sensitive scheme initially used by Sanskrit Library which was developed by Peter Scharf and (the late) Malcolm Hyman, who first described it in appendix B of their book Linguistic Issues in Encoding Sanskrit. The advantage of SLP1 over other encodings is that a single ASCII character is used for each Devanagari letter, a peculiarity that eases reverse transliteration.

Hinglish refers to the non standardised Romanised Hindi used online, and especially on social media. In India, Romanised Hindi is the dominant form of expression online. In an analysis of YouTube comments, Palakodety et al., identified that 52% of comments were in Romanised Hindi, 46% in English, and 1% in Devanagari Hindi.

Other less popular ASCII schemes include WX notation, Vedatype and the 7 bit ISO 15919. WX notation is a transliteration scheme for representing Indian languages in ASCII. It originated at IIT Kanpur for computational processing of Indian languages and is widely used among the natural language processing (NLP) community in India. This scheme is described in NLP Panini (Appendix B). It is similar to, but not as versatile as, SLP1, as far as the coverage of Vedic Sanskrit is concerned. Comparison of WX with other schemes is found in Huet (2009), App A Vedatype is another scheme used for encoding Vedic texts at Maharishi University of Management. An online transcoding utility across all these schemes is provided at the Sanskrit Library. ISO 15919 includes a so called "limited character set" option to replace the diacritics by prefixes, so that it is ASCII compatible. A pictorial explanation is here from Anthony Stone.

The following is a comparison of the major transliteration methods used for Devanāgarī.

DevanāgarīIASTISO 15919Monier Williams72Harvard KyotoITRANSVelthuisSLP1WXअ aaaaaaaaआ āāāAA/aaaaAAइ iiiiiiiiई īīīII/iiiiIIउ uuuuuuuuऊ ūūūUU/uuuuUUए eēeeeeeeऐ aiaiaiaiaiaiEEओ oōooooooऔ auauauauauauOO ऋ ṛr̥ṛiRRRi/R^i. rfqॠ ṝr̥̄ṛīRRRRI/R^I. rrFQऌ ḷl̥lṛilRLLi/L^i. lxLॡ ḹl̥̄lṛīlRRLLI/L^I. llXLY अं ṃṁṉ/ṃMM/. n/. m. mMMअः ḥḥḥHH. hHHअँ ãm̐ N ~az ऽ '’ '. a. a'Z

The Devanāgarī standalone consonant letters are followed by an implicit shwa (/Ə/). In all of the transliteration systems, that /Ə/ must be represented explicitly using an 'a' or any equivalent of shwa. DevanāgarīIASTISO 15919Monier Williams72Harvard KyotoITRANSVelthuisSLP1WXक kakakakakakakakaख khakhakhakhakhakhaKaKaग gagagagagagagagaघ ghaghaghaghaghaghaGaGaङ ṅaṅan·aGa~Na"naNafaच cacaćachachacacacaछ chachaćhachhaChachhaCaCaज jajajajajajajajaझ jhajhajhajhajhajhaJaJaञ ñañaṅaJa~na~naYaFaट ṭaṭaṭaTaTa. tawataठ ṭhaṭhaṭhaThaTha. thaWaTaड ḍaḍaḍaDaDa. daqadaढ ḍhaḍhaḍhaDhaDha. dhaQaDaण ṇaṇaṇaNaNa. naRaNaत tatatatatatatawaथ thathathathathathaTaWaद dadadadadadadaxaध dhadhadhadhadhadhaDaXaन nanananananananaप papapapapapapapaफ phaphaphaphaphaphaPaPaब babababababababaभ bhabhabhabhabhabhaBaBaम mamamamamamamamaय yayayayayayayayaर rarararararararaल lalalalalalalalaव vavavavava/wavavavaश śaśaṡazasha"saSaSaष ṣaṣashaSaSha. sazaRaस sasasasasasasasaह hahahahahahahahaळ ḻaḷa LaLa. laLalY

DevanāgarīISO 15919Harvard KyotoITRANSVelthuisSLP1WXक्षkṣa kSakSa/kSha/xak. sakzakRaत्रtratratratratrawraज्ञjña jJaGYa/j~naj~najYajFaश्रśrazrashra"sraSraSra

DevanāgarīISO 15919ITRANSWXक़qaqakZaख़k͟haKaKZaग़ġaGagZaज़zazajZaफ़fafaPZaड़ṛa. Da/RadZaढ़ṛha. Dha/RhaDZa

The table below shows just the differences between ISO 15919 and IAST for Devanagari transliteration. DevanagariISO 15919IAST Commentए / ेISOeTo distinguish between long and short 'e' in Dravidian languages, 'e' now represents ऎ / ॆ (short). Note that the use of ISO is considered optional in ISO 15919, and using ISO for ए (long) is acceptable for languages that do not distinguish long and short e.ओ / ोISOoTo distinguish between long and short 'o' in Dravidian languages, 'o' now represents ऒ / ॊ (short). Note that the use of ISO is considered optional in ISO 15919, and using ISO for ओ (long) is acceptable for languages that do not distinguish long and short o.ऋ / ृISOṛIn ISO 15919, ṛ is used to represent ड़.ॠ / ॄISOṝFor consistency with r̥ऌ / ॢISOḷIn ISO 15919, ḷ is used to represent ळ.ॡ / ॣISOḹFor consistency with l̥◌ंISOṃISO 15919 has two options about anusvāra. (1) In the simplified nasalisation option, an anusvāra is always transliterated as ṁ. (2) In the strict nasalization option, anusvāra before a class consonant is transliterated as the class nasal—ṅ before k, kh, g, gh, ṅ; ñ before c, ch, j, jh, ñ; ṇ before ṭ, ṭh, ḍ, ḍh, ṇ; n before t, th, d, dh, n; m before p, ph, b, bh, m. ṃ is sometimes used to specifically represent Gurmukhi Tippi ੰ. ISO◌ँISOm̐Vowel nasalisation is transliterated as a tilde above the transliterated vowel (over the second vowel in the case of a digraph such as aĩ, aũ), except in Sanskrit.ळḻḷUsed in Vedic Sanskrit only and not found in the Classical variant

Most Indian languages make a distinction between the retroflex and dental forms of the dental consonants. In formal transliteration schemes, the standard Roman letters are used to indicate the dental form, and the retroflex form is indicated by special marks, or the use of other letters. E. g., in IAST transliteration, the retroflex forms are ṇ, ṭ, ḍ and ṣ. In most informal transcriptions the distinction between retroflex and dental consonants is not indicated. However, many capitalise retroflex consonants on QWERTY keyboard in informal messaging. That generally obviates the need for transliteration.

Where the letter "h" appears after a plosive consonant in Devanāgarī transliteration, it always indicates aspiration. Thus "ph" is pronounced as the p in "pit" (with a small puff of air released as it is said), never as the ph in "photo" (IPA /f/). (On the other hand, "p" is pronounced as the p in "spit" with no release of air.) Similarly "th" is an aspirated "t", neither the th of "this" (voiced, IPA /ð/) nor the th of "thin" (unvoiced, IPA /θ/). The aspiration is generally indicated in both formal and informal transliteration systems.

As English is widely used a professional and higher education language in India, availability of Devanagari keyboards is dwarfed by English keyboards. Similarly, software and user interfaces released and promoted in India are in English, as is much of the computer education available there. Due to low awareness of Devanagari keyboard layouts, many Indian users type Hindi in the Roman script. Before Devanagari was added to Unicode, many workarounds were used to display Devanagari on the Internet, and many sites and services have continued using them despite widespread availability of Unicode fonts supporting Devanagari. Although there are several transliteration conventions on transliterating Hindi to Roman, most of these are reliant on diacritics. As most Indians are familiar with the Roman script through the English language (which traditionally does not use diacritics), these transliteration systems are much less widely known. Most such "Romanagari" is transliterated arbitrarily to imitate English spelling, and thus results in numerous inconsistencies. It is also detrimental to search engines, which do not classify Hindi text in the Roman script as Hindi. The same text may also not be classified as English. Regardless of the physical keyboard's layout, it is possible to install Unicode based Hindi keyboard layouts on most modern operating systems. There are many online services available that transliterate text written in Roman to Devanagari accurately, using Hindi dictionaries for reference, such as Google transliteration or Microsoft Indic Language Input Tool. This solution is similar to input method editors, which are traditionally used to input text in languages that use complex characters such as Chinese, Japanese or Korean.

Early Sanskrit texts were originally transmitted by memorisation and repetition. Post Harappan India had no system for writing Indic languages until the creation (in the 4th 3rd centuries BCE) of the Kharoshti and Brahmi scripts. These writing systems, though adequate for Middle Indic languages, were not well adapted to writing Sanskrit. However, later descendants of Brahmi were modified so that they could record Sanskrit in exacting phonetic detail. The earliest physical text in Sanskrit is a rock inscription by the Western Kshatrapa ruler Rudradaman, written c. 150 CE in Junagadh, Gujarat. Due to the remarkable proliferation of different varieties of Brahmi in the Middle Ages, there is today no single script used for writing Sanskrit; rather, Sanskrit scholars can write the language in a form of whatever script is used to write their local language. However, since the late Middle Ages, there has been a tendency to use Devanagari for writing Sanskrit texts for a widespread readership. Western scholars in the 19th century adopted Devanagari for printed editions of Sanskrit texts. The editio princeps of the Rigveda by Max Müller was in Devanagari. Müller's London typesetters competed with their Petersburg peers working on Böhtlingk's and Roth's dictionary in cutting all the required ligature types. From its beginnings, Western Sanskrit philology also felt the need for a romanised spelling of the language. Franz Bopp in 1816 used a romanisation scheme, alongside Devanagari, differing from IAST in expressing vowel length by a circumflex (â, î, û), and aspiration by a spiritus asper (e. g. bʽ for IAST bh). The sibilants IAST ṣ and ś he expressed with spiritus asper and lenis, respectively (sʽ, sʼ). Monier Williams in his 1899 dictionary used ć, ṡ and sh for IAST c, ś and ṣ, respectively. From the late 19th century, Western interest in typesetting Devanagari decreased. Theodor Aufrecht published his 1877 edition of the Rigveda in romanised Sanskrit, and Arthur Macdonell's 1910 Vedic grammar (and 1916 Vedic grammar for students) likewise do without Devanagari (while his introductory Sanskrit grammar for students retains Devanagari alongside romanised Sanskrit). Contemporary Western editions of Sanskrit texts appear mostly in IAST.