[ilreq] new-updated-ilreq

slata has just created a new issue for https://github.com/w3c/ilreq:

== new-updated-ilreq ==
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    <head>
    <title>Indic Layout Requirements</title>
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h1 acronym, h2 acronym, h3 acronym, h4 acronym, h5 acronym, h6 
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    <body id="respecDocument" role="document" class="h-entry">
<section id='abstract'>
      <p>This document describes the basic requirements for Indian 
Languages layout for display purpose. It discusses some of the major 
layout requirements in first letter pseudo-element, vertical 
arrangements of characters, letter spacing, text segmentation, line 
breaking and collation rules in Indic languages. </p>
      <p>The minimal requirements presented in this document for  
Indian languages text layout will also be used in E-publishing and CSS
 Standard. This documents covers major issues of e-content in Indian 
languages in order to  create standardize format of text layout to 
address storage, rendering  problems, vertical writing, letter 
spacing, collation, line breaking etc.</p>
      <p>It also describes the definition of ABNF(Augmented 
Backus–Naur Form)
    based valid segmentation-Indic orthographic syllable in order to 
get the proper display in the browsers. The text 
segmentation[[!UAX29]] and line breaking  [[!UAX14]] algorithms are 
considered in detail. The CSS & digital publications standards will 
benefit from this document. 
  </section>
<section id='sotd'>
      <p>This document describes the basic requirements for Indic 
script layout and text support on the Web and in eBooks. These 
requirements provide information for Web technologies such as CSS, 
HTML and SVG about how to support users of Indic scripts.  The current
 document focuses on Devanagari, but there are plans to widen the 
scope to encompass additional Indian scripts as time goes on. </p>
      <p>The editor's draft of this document is being developed by the
 <a href="http://www.w3.org/International/groups/indic-layout/">Indic 
Layout Task Force</a>, part of the W3C <a 
href="http://www.w3.org/International/ig/">Internationalization 
Interest Group</a>. It is published by the <a 
href="http://www.w3.org/International/core/">Internationalization 
Working Group</a>. The end target for this document is a Working Group
 Note.</p>
    </section>
<section>
      <h2>Introduction</h2>
      <section>
    <h2>Indian language complexities</h2>
    <p> India has large linguistic diversity with 22 constitutionally 
recognized languages and 12 scripts.This document is currently focused
 on the Devanagari script. The expectation is that over time its scope
 will widen to cover additional major scripts from the list below.</p>
    <p>The mapping between languages and scripts is complex. Multiple 
languages may have common scripts, while a language can be  written in
 multiple scripts. Each language and script is unique in nature and 
cannot be easily replicated, even if they share common 
characteristics. The orthographic changes may also occur in some 
languages and adoption of new orthography is a gradual process, thus 
posing additional challenges.</p>
    <div class="tab-format1">
          <table  class="tab-format1">
        <tr>
              <td>Serial No.</td>
              <td>Language</td>
              <td>Script</td>
            </tr>
        <tr>
              <td>1</td>
              <td>Hindi</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>2</td>
              <td>Sanskrit</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>3</td>
              <td>Marathi</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>4</td>
              <td>Konkani</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>5</td>
              <td>Nepali</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>6</td>
              <td>Maithili</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>7</td>
              <td>Sindhi</td>
              <td>Devanagari, Perso-Arabic</td>
            </tr>
        <tr>
              <td>8</td>
              <td>Bodo</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>9</td>
              <td>Dogri</td>
              <td>Devanagari</td>
            </tr>
        <tr>
              <td>10</td>
              <td>Bengali</td>
              <td>Bengali</td>
            </tr>
        <tr>
              <td>11</td>
              <td>Assamese</td>
              <td>Bengali</td>
            </tr>
        <tr>
              <td>12</td>
              <td>Manipuri</td>
              <td>Bengali, Meetei (Mayak)</td>
            </tr>
        <tr>
              <td>13</td>
              <td>Gujarati</td>
              <td>Gujarati</td>
            </tr>
        <tr>
              <td>14</td>
              <td>Kannada</td>
              <td>Kannada</td>
            </tr>
        <tr>
              <td>15</td>
              <td>Malayalam</td>
              <td>Malayalam</td>
            </tr>
        <tr>
              <td>16</td>
              <td>Odia</td>
              <td>Odia</td>
            </tr>
        <tr>
              <td>17</td>
              <td>Punjabi</td>
              <td>Gurmukhi</td>
            </tr>
        <tr>
              <td>18</td>
              <td>Tamil</td>
              <td>Tamil</td>
            </tr>
        <tr>
              <td>19</td>
              <td>Telugu</td>
              <td>Telugu</td>
            </tr>
        <tr>
              <td>20</td>
              <td>Urdu</td>
              <td>Perso-Arabic</td>
            </tr>
        <tr>
              <td>21</td>
              <td>Santhali</td>
              <td>Ol-Chiki, Devanagari</td>
            </tr>
        <tr>
              <td>22</td>
              <td>Kashmiri</td>
              <td>Devanagari, Perso-Arabic</td>
            </tr>
      </table>
        </div>
    <p>The scripts of South Asia share so many common features that a 
side-by-side comparison
          of a few will often reveal structural similarities even in 
the modern letter forms. They are all
          abugidas in which most symbols stand for a consonant plus an
 inherent vowel (usually the sound /a/).The North Indian branch of 
scripts was, like Brahmi itself, mainly used to write Indo-European 
languages such as Pali and Sanskrit, and eventually the Hindi, 
Bengali, and Gujarati
          languages, though it was also the source for scripts for 
non-Indo-European languages such
          as Tibetan, Mongolian, and Lepcha. The South Indian scripts 
are also derived from Brahmi and, therefore, share many similarities 
in structural characteristics. For more details visit 
[[!South-Asian-Scripts]].</p>
    <p>The following figure shows the evolution of Indian scripts over
 a period of times from Brahmi script.</p>
    <figure> <img src="images/Brahmi.jpg" width="617" height="637" 
alt="Evolution of Indic Scripts"/>
          <figcaption>Development of Indian Scripts</figcaption>
        </figure>
    For more details visit  [[!Evolution-of-Indic-Scripts]]</section>
      <section>
    <h3>Basic components of Indian languages</h3>
    <p></p>
    <section>
          <h4>Unicode & CLDR</h4>
          <p><b>Unicode</b> is the Universal character encoding 
standard, used for representing text for information processing. 
Unicode encodes all of the individual characters used for all the 
written languages of the world. The standards provide information 
about the character and their use. </p>
          <p><b>Common Locale Data Repository</b> is the largest 
standard repository of locale data in the world. It is managed by 
Unicode Consortium. It provides locale data in an XML format for use 
in computer applications. It facilitates locale-related information 
sharing among applications regardless of their domains. Its goal is to
 provide basic linguistic information for diverse “locales” in an 
open, interoperable form.</p>
          <p>This data is usable for localizing applications. </p>
          <p>Some examples of the information that CLDR gathers for 
languages and territories are:</p>
          <ul>
        <li>Date formats </li>
        <li>Time Zones </li>
        <li>Number formats </li>
        <li>Currency and its formats </li>
        <li>Measurement Systems</li>
        <li>Collation (Sort order) Specification: Sorting, Searching 
and Matching</li>
        <li>Translations of names for language, territory, script, 
time zones, currencies </li>
        <li>Script and exemplar characters used by a language</li>
        <li>Calendaring rules, Formats and important dates.</li>
      </ul>
          <p class="note">Reference URL:  [[!CLDR]]</p>
        </section>
    <section>
          <h4>Unicode Normalization</h4>
          <p>Unicode normalization[[!UAX15]] is a form of text 
normalization that transforms equivalent sequences of characters into 
the same representation. Unicode normalization is important in Unicode
 text processing applications, because it affects the semantics of 
comparing, searching, and sorting Unicode sequences</p>
          <p>When a unique representation is required , a normalized 
form of Unicode text can be used to eliminate unwanted distinctions. 
The key part of normalization is to provide a unique canonical order 
for visually non distinct sequences of combining characters.</p>
          <section>
        <h5>Canonical & Compatible Equivalence</h5>
        <p>Unicode contains numerous characters to maintain 
compatibility with existing standards, some of which are functionally 
equivalent to other characters or sequences of characters. Because of 
this, Unicode defines some code point sequences as equivalent. Unicode
 provides two notions of equivalence: canonical and compatible.</p>
        <p>Canonical equivalence is a form of equivalence that 
preserves visually and functionally equivalent characters.</p>
        <p>The following figure shows the canonical equivalence:</p>
        <figure> <img src="images/can-eq.jpg" width="547" height="83" 
alt="Canonical equivalence in Hindi" />
              <figcaption>Canonical Equivalence</figcaption>
            </figure>
      </section>
        </section>
    <section>
          <h4>Unicode Code charts- Devanagari & Devanagari 
Extended</h4>
          <p>The following Unicode Character Code chart as per The 
Unicode Standard, Version 7.0 :
        <figure> <img src="images/code-chart.jpg" width="549" 
height="777" alt="Devanagari and Devanagari extended Code Chart" />
              <figcaption>Unicode Devanagari and Devanagari extended 
Code Chart</figcaption>
            </figure>
      <p class="note">The Unicode code charts for other Indic scripts 
are available at [[!Code-Charts]]</p>
        </section>
    <section>
          <h4>Character Set for Hindi</h4>
          <p>This section provides the basic alphabetic system of 
Devanagari Script as used for Hindi Consonants, Vowels, Modifiers, 
Matras, Virama/ Halant, Nukta etc.</p>
          <h5>Consonant set</h5>
          <div class="tab-format1">
        <table>
              <tr>
            <td>क</td>
            <td>क़ </td>
            <td>ख </td>
            <td>ख़ </td>
            <td>ग </td>
          </tr>
              <tr>
            <td>ग़ </td>
            <td>घ </td>
            <td>ङ </td>
            <td>च </td>
            <td>छ </td>
          </tr>
              <tr>
            <td>ज </td>
            <td>ज़ </td>
            <td>झ </td>
            <td>ञ </td>
            <td>ट </td>
          </tr>
              <tr>
            <td>ठ </td>
            <td>ड </td>
            <td>ड़ </td>
            <td>ढ </td>
            <td>ढ़ </td>
          </tr>
              <tr>
            <td>ण </td>
            <td>त </td>
            <td>थ </td>
            <td>द </td>
            <td>ध </td>
          </tr>
              <tr>
            <td>न </td>
            <td>प </td>
            <td>फ </td>
            <td>फ़ </td>
            <td>ब </td>
          </tr>
              <tr>
            <td>भ </td>
            <td>म </td>
            <td>य </td>
            <td>र </td>
            <td>ल </td>
          </tr>
              <tr>
            <td>व </td>
            <td>श </td>
            <td>ष </td>
            <td>स </td>
            <td>ह </td>
          </tr>
            </table>
        <h5>Vowel set</h5>
        <table>
              <tr>
            <td>अ</td>
            <td>आ </td>
            <td>इ </td>
            <td>ई </td>
            <td>उ </td>
            <td>ऊ </td>
            <td>ऋ </td>
            <td>ए </td>
            <td>ऍ </td>
            <td>ऐ </td>
            <td>ओ </td>
            <td>ऑ</td>
            <td>औ </td>
          </tr>
            </table>
        <h5>Modifiers</h5>
        <table>
              <tr>
            <td> ं -    Anuswara </td>
            <td>Anuswara,    an archinasal, is denoted by a dot  above
    the letter after which it is to be pronounced.
                  This    falls under Nasal category.</td>
          </tr>
              <tr>
            <td>ँ -Chandrabindu </td>
            <td>Candrabindu    is pure nasalization as air comes from 
the nose. It is denoted by a breve    with a dot superposed above  the
 letter    after which it is to be pronounced. This falls under Nasal 
category. </td>
          </tr>
              <tr>
            <td>ः -    Visarga </td>
            <td>Visarga(sending forth),    denoted by two dots placed 
one above the other.</td>
          </tr>
              <tr>
            <td>ऽ - Avagraha</td>
            <td>For    extra length with long vowels as seen in the 
Sanskrit text </td>
          </tr>
            </table>
        <h5>Matras</h5>
        <table>
              <tr>
            <td>ा </td>
            <td>ि </td>
            <td>ी </td>
            <td>ु </td>
            <td>ू </td>
            <td>ृ </td>
            <td>े </td>
            <td>ॅ </td>
            <td>ै </td>
            <td>ो </td>
            <td>ॉ </td>
            <td>ौ </td>
          </tr>
            </table>
      </div>
          <h5>Virama(्)</h5>
          Virama is used in most writing system to signify the lack of
 inherent vowel.
      <h5>Nukta(़) </h5>
          Nukta is used in Hindi
          <p class="note"> For more information See 
[[!Draft-Script-Grammar]] </p>
        </section>
  </section>
    </section>
<section>
      <h2>Indic orthographic syllable boundaries(ABNF Valid 
segmentation-Proposed solution for layout issues in Indian 
languages)</h2>
      <section>
    <h3>Need for ABNF valid segmentation</h3>
    <p>ABNF Valid Segmentation  based  Indic orthographic syllable 
definition is provided here for correct and standardized 
representation of Indian languages layout. This will address various 
issues mentioned in the following sections. </p>
    <p>This definition will be useful in order to get the uniform 
display of Indic layout in the browsers, applications, Digital 
publishing etc.</p>
  </section>
      <section>
    <h3>ABNF based definition of Indic orthographic syllable</h3>
    <p>Augmented Backus–Naur Form (ABNF) is a meta-language based on 
Backus–Naur Form (BNF), but consisting of its own syntax and 
derivation rules. The motive principle for ABNF is to describe a 
formal system of a language to be used as a bidirectional 
communications protocol.</p>
    <p><b>V[m] |{CH}C[v][m]|CH </b><br />
      <br />
  <br />
          The linguistic definition of Indic orthographic syllable has
 been mapped to ABNF(Augmented Backus–Naur Form) for the purpose of 
text segmentation, line breaking , drop letter, letter spacing in 
horizontal text and vertical text representation. The definition has 
been elaborated , taking Hindi as an example.</p>
    <p>The definition is a combination of 3 rules :</p>
    <p>Rule 1 : V[m]</p>
    <p>Rule 2 : {CH}C[v][m]</p>
    <p>Rule 3 : CH  (This rule is applicable only at the end of the 
word)</p>
    V(upper case) is independent vowel<br />
    <br />
    m is modifier(Anusvara/Visarga/Chandrabindu)<br />
    <br />
    C is a consonant which may or may not include a single nukta <br 
/>
    <br />
    v (lower case) is any dependent vowel or vowel sign (mātrā)<br />
    <br />
    H is Virama <br />
    <br />
    | is a rule separator<br />
    <br />
    [ ] - The enclosed items is optional under this bracket<br />
    <br />
    {} - The enclosed item/items occurs zero or repeated multiple 
times </section>
      <section>
    <h3>Various Use cases of ABNF based Indic orthographic syllable 
definition for Hindi language as example</h3>
    <p><b>Rule 1 : V[m]</b></p>
    <div class="tab-format1">
          <table  class="tab-format">
        <tr>
              <td>Sl. No.</td>
              <td>Examples</td>
              <td>Definition</td>
            </tr>
        <tr>
              <td>1</td>
              <td>अ, ई, उ </td>
              <td>V (Vowel) is a    syllable </td>
            </tr>
        <tr>
              <td>2</td>
              <td>अं, उँ, आः </td>
              <td>V+ Modifier is a    syllable</td>
            </tr>
      </table>
          <p><b>Rule 2 : {CH}C[v][m]</b></p>
          <table  class="tab-format">
        <tr>
              <td>Sl. No.</td>
              <td>Examples</td>
              <td>Definition</td>
            </tr>
        <tr>
              <td>1</td>
              <td>र, क, ज, ल, म </td>
              <td>Consonant is a syllable</td>
            </tr>
        <tr>
              <td>2</td>
              <td>प्प, क्ख,च्त, ज्ज्व, त्क्ल, त्स्न</td>
              <td>Zero or more    Consonant + Virama sequences 
followed by consonant is a syllable</td>
            </tr>
        <tr>
              <td>3</td>
              <td>र्त, र्त्स, र्त्स्न,    र्त्स्न्य, फ़्क़ </td>
              <td>Zero or more Consonant (Nukta) +Virama  followed    
by consonant is a syllable </td>
            </tr>
        <tr>
              <td>4</td>
              <td>र्ता, र्त्स्न्या, फ़्जी, क्या</td>
              <td>Zero or more consonant+ (Nukta)+ virāma sequences
    followed by a consonant (+Nukta) followed by a vowel sign is a 
syllable</td>
            </tr>
        <tr>
              <td>5</td>
              <td>तः,स्तं, स्त्रँ, स्तः, फ़्ज़ँ  </td>
              <td>zero or more consonant+ (Nukta)+ virāma sequences 
followed by a consonant (+Nukta) followed by modifier is a 
syllable</td>
            </tr>
        <tr>
              <td>6</td>
              <td>र्त्स्न्या:    त्स्न्युं, त्स्न्युँ, 
फ़्ज़ें,हिं</td>
              <td>zero or more consonant+ (Nukta)+ virāma sequences
    followed by a consonant (+Nukta) followed by a vowel sign and 
modifier is a syllable</td>
            </tr>
        <tr>
              <td>7</td>
              <td>स्थि, ज्जि, ख्वा </td>
              <td>Zero or more Consonant +Virama sequences followed by
 a    consonant and vowel sign is a syllable</td>
            </tr>
      </table>
          <p><b>Rule 3 : CH</b></p>
          <p><b>त्,व्, म्, भ् etc are syllable in Hindi only at the 
end of the word </b></p>
          <p><b>Examples of combination of the rules :</b></p>
          <p><b>1.   स्वागतम् -  CHCv + C + C + CH has following 
syllables :</b></p>
          <table  class="tab-format">
        <tr>
              <td><strong>स्वा</strong></td>
              <td><strong>CHCv</strong></td>
            </tr>
        <tr>
              <td><strong>ग</strong></td>
              <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>त</strong></td>
              <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>म्</strong></td>
              <td><strong>CH</strong></td>
            </tr>
      </table>
          <p><b>2. भरतनाट्यम- C + C + C + Cv + CHC + C</b></p>
          <table class="tab-format">
        <tr>
              <td><strong>भ</strong></td>
              <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>र</strong></td>
              <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>त</strong></td>
              <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>ना</strong></td>
              <td><strong>Cv</strong></td>
            </tr>
        <tr>
              <td><strong>ट्य</strong></td>
              <td><strong>CHC</strong></td>
            </tr>
        <tr>
              <td><strong>म</strong></td>
              <td><strong>C</strong></td>
            </tr>
      </table>
        </div>
  </section>
  <section>
 <h2>Use cases of ABNF based Indic orthographic syllable definition 
for other languages</h2>
  <p><b>Rule 1 : V[m]</b></p>
  <div class="tab-format1">
 <table class="tab-format">
 <tr>
 <td width="102"><strong>Sl. No.</strong></td>
 <td width="281"><strong>Examples</strong></td>
 <td width="580"><strong>Definition</strong></td>
 </tr>
 <tr>
 <td width="102"><strong>1.</strong></td>
 <td width="281"><strong>ಅ , అ, ఇ </strong></td>
 <td width="580"><strong>V (Vowel) is a syllable </strong></td>
 </tr>
  <tr>
              <td>2</td>
              <td>అం, ఆః</td>
              <td><strong>V+ Modifier is a    syllable</strong></td>
            </tr>
 </table>
 <p><b>Rule 2 : {CH}C[v][m]</b></p>
 <table  class="tab-format">
        <tr>
              <td>Sl. No.</td>
              <td>Examples</td>
              <td>Definition</td>
            </tr>
        <tr>
              <td>1</td>
              <td>ర, క , ರ, ಕ</td>
          <td>Consonant is a syllable</td>
            </tr>
        <tr>
              <td>2</td>
              <td> క్ఖ, చ్త , ಪ್ಪ,  ಕ್ಖ</td>
              <td>Zero or more    Consonant + Virama sequences 
followed by consonant is a syllable</td>
            </tr>
        <tr>
              <td>3</td>
              <td> ర్త్స్న, ర్త , ರ್ತ್ಸ್ನ್ಯ</td>
          <td>Zero or more Consonant (Nukta) +Virama  followed    by 
consonant is a syllable </td>
            </tr>
        <tr>
              <td>4</td>
              <td> ర్తా , ర్త్స్న్యా , ಕ್ಯಾ</td>
          <td>Zero or more consonant+ (Nukta)+ virāma sequences    
followed by a consonant (+Nukta) followed by a vowel sign is a 
syllable</td>
            </tr>
        <tr>
              <td>5</td>
              <td> తః , స్తం , ಸ್ತಃ, ಹಿಂ</td>
          <td>zero or more consonant+ (Nukta)+ virāma sequences 
followed by a consonant (+Nukta) followed by modifier is a 
syllable</td>
            </tr>   
        <tr>
              <td>6</td>
              <td>హిం</td>
              <td>zero or more consonant+ (Nukta)+ virāma sequences
    followed by a consonant (+Nukta) followed by a vowel sign and 
modifier is a syllable</td>
            </tr>
        <tr>
              <td>7</td>
              <td>స్థి , జ్జి , ఖ్వా , ಖ್ವಾ</td>
          <td>Zero or more Consonant +Virama sequences followed by a
    consonant and vowel sign is a syllable</td>
            </tr>
      </table>
      <p><b>Rule 3 : CH</b></p>
          
          <p><b>Examples of combination of the rules :</b></p>
      <p><b>1.   స్వాగతమ్ , ಸ್ವಾಗತಮ್-  CHCv + C + C + CH has following
 syllables :</b></p>
          <table width="300"  class="tab-format">
<tr>
              <td><strong>స్వా , ಸ್ವಾ</strong></td>
              <td><strong>CHCv</strong></td>
            </tr>
        <tr>
              <td><strong>గ , ಗ</strong></td>
          <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>త , ತ</strong></td>
          <td><strong>C</strong></td>
            </tr>
        <tr>
              <td><strong>మ్ , ಮ್</strong></td>
          <td><strong>CH</strong></td>
            </tr>
      </table>
 
 </div>
 </section> 
    </section>
<section>
      <h2>Text segmentation</h2>
      <p>A string of Unicode-encoded text often needs to be broken up 
into text elements programmatically. Common examples of text elements 
include what users think of as characters, words, lines (more 
precisely, where line breaks are allowed), and sentences. The precise 
determination of text elements may vary according to orthographic 
conventions for a given script or language. The goal of matching user 
perceptions cannot always be met exactly because the text alone does 
not always contain enough information to unambiguously decide 
boundaries. For example, the period (U+002E FULL STOP) is used 
ambiguously, sometimes for end-of-sentence purposes, sometimes for 
abbreviations, and sometimes for numbers. In most cases, however, 
programmatic text boundaries can match user perceptions quite closely,
 although sometimes the best that can be done is not to surprise the 
user. Word boundaries are used in a number of different contexts. The 
most familiar ones are selection (double-click mouse selection, or 
“move to next word” control-arrow keys), and “Whole Word Search” for 
search and replace. They are also used in database queries, to 
determine whether elements are within a certain number of words of one
 another .
    Some special sentence boundaries like the double poorna virama, 
possibly with numbers (as in Sanskrit text, shlokas etc.) Grapheme 
cluster boundaries are           important for collation, regular 
expressions, UI        interactions (such as mouse selection, arrow 
key movement, backspacing),        segmentation for vertical text, 
identification of boundaries for        Initial-letter styling, and 
counting “character” positions within text. [[!UAX29]]</p>
      <p>Solution for word boundaries:<br />
    User-percieved characters boundaries  should be based on tailored 
Grapheme Cluster Boundaries to conform Indic orthographic syllable 
definition <br />
  </p>
      <p>In case of Devanagari phrase separator called Danda or 
purnaviram (।) and double danda (।।: used to mark end of the verse),In
 some of the browsers ending word is selected with purnaviram on 
double-click while in some browsers Danda is selected as a separate. 
It is recommended that  line should not  begin with purnaviram/Danda 
and double danda. So the properties of Danda should be same as the 
properties of FullStop or other punctuation marks so that new line 
should not begin with Danda and double danda.</p>
      <p>For others characters, the text segmentation should be done 
as Indic orthographic syllable.</p>
      <p>Indic script behavior in initial letter styling is based on 
syllables, rather than individual letter forms.</p> 
      <img src="images/drop-letter1.jpg" />

<p>The above Figure  shows an example of a drop intial in Hindi. In 
the first word of the paragraph, स्कूल ('skūl'), the sequence of 
characters is stored in memory is as follows:</p>
<img src="images/initial-letter-ex.jpg" />
<p>There are two syllables in this word: SA+VIRAMA+KA+UU and LA.  
Note, however, that there are three Unicode grapheme clusters here: 
SA+VIRAMA, KA+UU and LA.</p>
<p>Styling is done on the basis of the whole orthographic syllable, 
not the first character, nor even the first grapheme. </p>
<p>A syllable includes a base consonant and any combination of the 
following characters in the text stream:</p>
<ul>
<li>sequences of consonants preceded by virama (i.e. conjuncts).</li>
<li>vowel signs</li>
<li>visarga, anusvara or candrabindu.</li>
</ul>
    </section>
<section>
      <h2>Line breaking</h2>
      <p>When inline-level content is laid out into lines, it is 
broken across line boxes. Such a break is called a line break. In most
  writing systems, in the absence of hyphenation a line break occurs 
only at word  boundaries. Many writing systems use spaces or 
punctuation to explicitly  separate words, and line break 
opportunities can be identified by these  characters. Line  breaking, 
also known as word wrapping, is the process of breaking a section of  
text into lines such that it will fit in the available width of a 
page, window  or other display area. </p>
      <section>
    <h3>Hyphenation</h3>
    <p> There are different cases of hyphenation, some of the cases 
are given below :</p>
    <p><b>Case 1 :</b> Hyphens are commonly used in Copulative 
compounds words in Hindi language. Hindi has both prefixes and 
suffixes which are joined to words with a hyphen.<br />
        <h2>नर- नारी, लाभ- हानि, माता-पिता, ऊंच - नीच</h2>
    <p><b>Case 2:</b> Single word can breaks at the end of the line at
 Indic orthographic syllable level using hyphen </p>
    <p>In the below screenshot, words आकर्षण and विज्ञापन not follow 
Indic orthographic syllable definition in some of the browsers.</p>
    <br />
    <img src="images/hyphen.jpg" width="537" height="227" alt="Example
 of Line breaking" /> </section>
      <section>
    <h3>Guiding principles of Line breaking for Indian languages</h3>
    <p>In Indic writing system , it is preferred that line breaks at 
word boundaries ,if required following principles may be adhered :</p>
    <p><b>Rule 1:</b> New line cannot begin with following 
symbols/Punctuation marks. Also these should be retain with the 
associated text</p>
    <ul>
          <li>Closing brackets</li>
          <li>Devanagari Danda /Purnaviram</li>
          <li>Commas </li>
          <li>Visarga</li>
          <li>Decimal symbols</li>
          <li>Semicolon</li>
          <li>Repetition of punctuation marks such as semicolon with 
closing brackets, Semicolon with single/ Double quotes , Closing 
brackets with commas/Semicolon etc</li>
          <li>Mathematical operators</li>
        </ul>
    <p><b>Rule 2: </b>The definition of Indic orthographic syllable 
may be used to break the line and a hyphen should be at the breaking 
point so that word can be read intuitively</p>
    <p><b>Rule 3: </b>The hyphenated words can be broken at the hyphen
 e.g.:</p>
    <ul>
          <li>नर-नारी should be treated as:</li>
          <li>नर- on the first line and नारी on the next line</li>
        </ul>
    <p><b>Rule 4:</b> Expression with mathematical symbol should be 
treated as single unit so that at the end of the line expression 
should not breaks at operator level</p>
    <p><b>Rule 5:</b> Breaking should not be allowed at numerical 
values such as currency values, year etc. e.g.</p>
    <p>“100.00” or “10,000”, nor in “12:59”</p>
  </section>
    </section>
<section>
      <h2>Requirements for Indic Layout</h2>
      <section>
    <h3>Initial letter styling</h3>
     <p>Drop initial is a typographic effect emphasizing the initial 
letter(s) of a block element with a presentation similar to a 
'floated' element.</p>
    <section>
    <h4>Selecting initial letters</h4>
    
    <p>Initial letters are typically a single letter, which can be 
selected by the ::first-letter pseudo-element. But the drop initial 
letter in Indic scripts must be selected on the basis of orthographic 
syllables, rather than individual letter forms (see an example at the 
end of section 3, Text segmentation). The orthographic syllable may be
 a single Consonant/Vowel or the combinations of Unicode code points. 
A detailed definition of Indic syllables can be found in section 2, 
Indic Syllable boundaries.In Indian languages the size of the Initial 
Letter is determined by the number of the lines between top line of 
the syllable and lowest bit in the orthographic Indic syllable cluster
 where subjoined consonant and other diacritics  
appears.</p></section>
      <section>
    <h4>Typical drop initial usage in Indic scripts</h4>
    <p>Most of the Indic drop initial letters in magazines and 
newspapers use 2 to 4 line drops. Some examples are shown below.</p>
      <figure> <img src="images/dropcap-example2.png"/> 
          <figcaption>Examples of Indic Initial letters</figcaption>
        </figure>
    <p>The Sunken and raised Initial letter are not preffered in 
Indian languages.In examples of this kind, reference points on the 
drop cap must align precisely with reference points in the text. In 
Indic scripts the top reference point is the hanging base line for 
those scripts that have one, and the bottom alignment point is the 
text after-edge.</p>
    <p>Initial letter wrap property is not applicable for Indian 
languages.No contour-filling is required in Indian languages.</p>
    <p>Alignment of the top line of the non-highlighted characters is 
at the top of the thicker top line of the initial letter is commonly 
used in India.In some examples top lines of the initial letter and the
 following letters don't touch. This is due to variable 
technology/formats used by the publishers. It is preferred that both 
the top lines of Initial letter and neighbouring text should 
touch.Here are some additional  examples of initial highlighted letter
 and drop letter based on the Indic syllable definition.</p>
    </section>    
    
    
    
                  
          <table>
      <tr>
    <td><img src="images/I-letter2.png" alt="Bengali example" /></td>
     <td><img src="images/I-letter3.png" alt="Tamil example"/></td>
    </tr>
    <tr>
    <td><img src="images/I-letter1.png" width="526" height="338" 
alt="Bengali example" /></td>
     <td><img src="images/I-letter5.png" alt="Malayalam 
example"/></td>
    </tr>
     <tr>
    <td><img src="images/I-letter4.png" alt="Odia example"/></td>
     <td><img src="images/I-letter6.png" alt="Marathi example" 
width="555" height="255"/></td>
    </tr>
  </table>
  <p>The remainder of this section describes the detailed rules for 
placement and alignment of hindi characters with initial letter 
styling relative to the adjacent text.</p>
  <section id="h_indic_scripts_with_hanging_baseline">
  <h3>Alignment of Initial letter of Indic scripts with hanging 
baseline</h3>
  <p>Indian languages which use hanging baseline such as Hindi, 
Bengali, Gujarati, Marathi, Punjabi etc , the part from the hanging 
baseline and the ascent of the Initial letter may follow the following
 mechanism  :</p>
 <figure><img src="images/Hbaseline-rule.png" alt="Rule for hanging 
baseline">
          <figcaption>Rule of  Indic script  with hanging 
baseline</figcaption>
        </figure>
       <p>Where n=h/2</p>
       <p>In Indic scripts that have hanging baseline, the top 
alignment point is the hanging baseline, and the bottom alignment 
point is the text-after-edge and both the Initial letter and first 
line of text should be same aligned.</p>
       </section>
       <h3>Scripts that don't have hanging baseline such as Kannada, 
Tamil, Telugu, Malayalam , Odia etc</h3>

   <p>The publishers in India commonly used following rules for such 
scripts :</p>
   <ul>
   <li>The selection of the Initial letter is based on the Indic 
orthographic  syllable described in section 2.</li>
   <li>Ascent of the first non highlighted line is equal to the 
median/mean line of the Initial letter as shown below :</li>
   </ul>
   <img src="images/dropcap-south.png" alt="rule for South Indian 
languages" />
   <p>Based on above observations the general rule for South Indian 
languages will be :</p>
   <ul>
   <li> ¼ height of the total Drop Cap Height projected or ascended 
above the ascent of the first-line</li>
   <li>¾ of the total Drop Cap Height occupied or descended from 
ascent of first line or X1 to descent of the last line or line 
XN.</li>
       
                <h3>Initial Letter box formatting in Indian 
languages</h3>
        <p>The Indian publishers commonly used different height of the
 boxes and sizes of the characters. But it is proposed that the 
syllable with in the box is centre-aligned with reference to box 
parameters as shown in the figure below :</p>
       <figure> <img  src="images/initial-letter-box.png" 
alt="examples of Indic Initial letters within box" />
          <figcaption>Examples of Indic Initial letters within 
box</figcaption>
        </figure>
   </ul>
  </section>
 
      <section>
   
    <h3>Letter Spacing</h3>
    <p>In styling issues like horizontal spacing, the spacing between 
characters like C E R T I F I C A T E, the space is given between the 
every character in case of English. But in case of Indian language, 
the space needs to be introduced after each syllable for correct 
representation.</p>
    <p>For letter spacing in Indian languages it is recommended that 
spacing should follow Indic orthographic syllable definition. </p>
    <p>Here is the some examples of letter spacing that based on 
definition :</p>
    1.  अं त र्रा ष्ट्री य क र ण , అం త ర్ రా ష్ట్రీ య క ర ణ , ಅಂ ತ ರ್
 ರಾ ಷ್ಟ್ರೀ ಯ ಕ ರ ಣ<br />
    2.  स्वा ग त म् , స్వా గ త మ్ , ಸ್ವಾ ಗ ತಂ / ಸ್ವಾ ಗ ತ ಮ್<br />
    3.  सु स ज्जि त , సు స జ్జి త , ಸು ಸ ಜ್ಜಿ ತ<br />
    4.  स म्प्र ति, సం ప్ర తి ,  ಸಂ ಪ್ರ ತಿ</section>
      <section>
    
      <h3>Vertical arrangements of characters</h3>
    <p>In vertical arrangement of characters writing each character on
 a new line may not be suitable in Indian languages. The vertical 
arrangements of characters are sometimes used in Indian texts. In 
order to form correct arrangements, it is preferred to follow tailored
 grapheme cluster approach.
          Variations of vertical arrangement of the characters in 
Hindi is represent below :</p>
    <h4>Variations in vertical arrangements</h4>
    <figure> <img src="images/vert2.jpg" width="608" height="250" 
alt="Example of Vertical arrangements in Hindi" />
          <figcaption>Variations in vertical arrangements</figcaption>
        </figure>
    <h4>Vertical representation of the word 'स्वागतम्' based on Indic 
orthographic syllable definition:</h4>
    <table class="tab-format1">
          <tr>
        <td><strong>स्वा</strong></td>
      </tr>
          <tr>
        <td><strong>ग</strong></td>
      </tr>
          <tr>
        <td><strong>त</strong></td>
      </tr>
          <tr>
        <td><strong>म्</strong></td>
      </tr>
        </table>
        <br />
        <table class="tab-format1">
          <tr>
        <td><strong>స్వా</strong></td>
      </tr>
          <tr>
        <td><strong>గ</strong></td>
      </tr>
          <tr>
        <td><strong>త</strong></td>
      </tr>
          <tr>
        <td><strong>మ్</strong></td>
      </tr>
        </table>
  </section>
      <section>
    <h3>Collation</h3>
    <p>Collation is one of the most important features for Indic 
languages . It determines the order in which a given culture indexes 
its characters. This is best seen in a dictionary sorting order where 
for easy search words are sorted and arranged in a specific order. 
Within a given script, each allo-script may have a different 
sort-order. Thus in Hindi the conjunct glyph क्ष is sorted along with 
क , since the first letter of that conjunct is क and on a similar 
principle ज्ञ is sorted along with ज . The same is not the case with 
Marathi and Nepali which admit a different sort order.</p>
    <p>Different scripts admit different sort orders and for all high
          end NLP applications. Sorting is
          a crucial feature to ensure that the applications index data
 as per the cultural perception of
          that community. In quite a few States, sort order is clearly
 defined by the statutory bodies
          of that state and hence it is crucial that such sort order 
be ascertained and introduced in
          the document
          .</p>
    <p>The order(left to right) as given below is pertinent to sorting
 by a computer program and is compliant
          with CLDR as laid down by Unicode.</p>
    <div class="tab-format1">
          <table>
        <tr>
              <td> ़ <br />
            \u093C </td>
              <td>ॐ <br>
            \u0950</td>
              <td>ं <br>
            \u0902 </td>
              <td>ँ <br>
            \u0901></td>
              <td>ः <br>
            \u0903 </td>
              <td>अ <br>
            \u0905</td>
            </tr>
        <tr>
              <td>आ <br>
            \u0906 </td>
              <td>इ <br>
            \u0907 </td>
              <td>ई <br>
            \u0908 </td>
              <td>उ <br>
            \u0909 </td>
              <td>ऊ <br>
            \u090A </td>
              <td>ऋ <br>
            \u090B</td>
            </tr>
        <tr>
              <td>ऌ <br>
            \u090C </td>
              <td>ऍ <br>
            \u090D</td>
              <td>ए <br>
            \u090F </td>
              <td>ऐ <br>
            \u0910 </td>
              <td>ऑ <br>
            \u0911 </td>
              <td>ओ <br>
            \u0913 </td>
            </tr>
        <tr>
              <td>औ <br>
            \u0914</td>
              <td>क <br>
            \u0915 </td>
              <td>ख <br>
            \u0916</td>
              <td>ग <br>
            \u0917 </td>
              <td>घ <br>
            \u0918</td>
              <td>ङ <br>
            \u0919 </td>
            </tr>
        <tr>
              <td>च <br>
            \u091A </td>
              <td>छ <br>
            \u091B</td>
              <td>ज <br>
            \u091C</td>
              <td>झ <br>
            \u091D</td>
              <td>ञ <br>
            \u091E </td>
              <td>ट <br>
            \u091F </td>
            </tr>
        <tr>
              <td> ठ <br>
            \u0920</td>
              <td>ड <br>
            \u0921 </td>
              <td>ढ <br>
            \u0922 </td>
              <td>ण <br>
            \u0923 </td>
              <td>त <br>
            \u0924 </td>
              <td>थ <br>
            \u0925</td>
            </tr>
        <tr>
              <td>द <br>
            \u0926</td>
              <td>ध <br>
            \u0927 </td>
              <td>न <br>
            \u0928 </td>
              <td>प <br>
            \u092A </td>
              <td>फ <br>
            \u092B </td>
              <td>ब <br>
            \u092C </td>
            </tr>
        <tr>
              <td>भ <br>
            \u092D</td>
              <td>म <br>
            \u092E </td>
              <td>य <br>
            \u092F </td>
              <td>र <br>
            \u0930</td>
              <td>ल <br>
            \u0932 </td>
              <td>ळ <br>
            \u0933 </td>
            </tr>
        <tr>
              <td>व <br>
            \u0935</td>
              <td>श <br>
            \u0936 </td>
              <td>ष <br>
            \u0937 </td>
              <td>स <br>
            \u0938 </td>
              <td>ह <br>
            \u0939 </td>
              <td>ऽ <br>
            \u093D </td>
            </tr>
        <tr>
              <td>ा <br>
            \u093E </td>
              <td>ि <br>
            \u093F </td>
              <td>ी <br>
            \u0940</td>
              <td>ु <br>
            \u0941 </td>
              <td>ू <br>
            \u0942 </td>
              <td>\U0943</td>
            </tr>
        <tr>
              <td>\U0944 </td>
              <td>\U0945 </td>
              <td>े <br>
            \u0947 </td>
              <td>ै <br>
            \u0948</td>
              <td>ॉ <br>
            \u0949</td>
              <td>ो <br>
            \u094B </td>
            </tr>
        <tr>
              <td>ौ <br>
            \u094C </td>
              <td>्<br>
            \u094D</td>
              <td></td>
              <td></td>
              <td></td>
              <td></td>
            </tr>
      </table>
        </div>
    <p>Following is the sort order of Consonant 'क'</p>
    <div class="tab-format1">
          <table>
        <tr>
              <td>क</td>
              <td>कँ </td>
              <td>कं </td>
              <td>कः </td>
              <td>का </td>
              <td>कि </td>
              <td>की </td>
              <td>कु </td>
              <td>कू </td>
              <td>कृ </td>
              <td>के </td>
              <td>कॅ</td>
            </tr>
        <tr>
              <td>कै </td>
              <td>को </td>
              <td>कॉ </td>
              <td>कौ </td>
              <td>क् </td>
              <td>क़ </td>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
            </tr>
      </table>
        </div>
  </section>
    </section>
<section>
      <h2>Contributors</h2>
      <div class="tab-format1">
    <table>
          <tr>
        <td><strong>Serial No.</strong></td>
        <td><strong>Name</strong></td>
        <td><strong>Organization</strong></td>
      </tr>
          <tr>
        <td>1</td>
        <td>Manoj Kumar Jain</td>
        <td>DeitY</td>
      </tr
                  >
          <tr>
        <td>2</td>
        <td>Gautam Sengupta</td>
        <td>University of Hyderabad </td>
      </tr>
          <tr>
        <td>3</td>
        <td>Girish Nath Jha</td>
        <td>JNU</td>
      </tr>
          <tr>
        <td>4</td>
        <td>Rajeev Sangal</td>
        <td>IIT Varanasi</td>
      </tr>
          <tr>
        <td>5</td>
        <td>Dipti Misra Sharma</td>
        <td>IIIT Hyderabad</td>
      </tr>
          <tr>
        <td>6</td>
        <td>R K Sharma</td>
        <td>Thapar University</td>
      </tr>
          <tr>
        <td>7</td>
        <td>Rajat Mohanty</td>
        <td>IIT Bombay</td>
      </tr>
          <tr>
        <td>8</td>
        <td>Venkatesh Choppella</td>
        <td>IIIT Hyderabad</td>
      </tr>
          <tr>
        <td>9</td>
        <td>Soma Paul</td>
        <td>IIIT Hyderabad</td>
      </tr>
          <tr>
        <td>10</td>
        <td>M D Kulkarni</td>
        <td>C-DAC Pune</td>
      </tr>
          <tr>
        <td>11</td>
        <td>Panchanan Mohanty</td>
        <td>University of Hyderabad</td>
      </tr>
          <tr>
        <td>12</td>
        <td>G. Uma Maheshwar Rao</td>
        <td>University of Hyderabad</td>
      </tr>
       <tr>
        <td>13</td>
        <td>Dr. Bisembli P. Hemananda</td>
        <td>University of Mysore</td>
      </tr>
      <tr>
        <td>13</td>
        <td>Dr. R. Chandrashekar</td>
        <td>JNU</td>
      </tr>
        </table>
  </div>
    </section>
</body>
</html>


Please view or discuss this issue at 
https://github.com/w3c/ilreq/issues/4 using your GitHub account

Received on Thursday, 5 May 2016 05:54:47 UTC