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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="text-runs"></a>Text runs</h2></div></div></div> |
| <p> |
| Real-world text usually contains codepoints from a mixture of |
| different Unicode scripts (including punctuation, numbers, symbols, |
| white-space characters, and other codepoints that do not belong |
| to any script). Real-world text may also be marked up with |
| formatting that changes font properties (including the font, |
| font style, and font size). |
| </p> |
| <p> |
| For shaping purposes, all real-world text streams must be first |
| segmented into runs that have a uniform set of properties. |
| </p> |
| <p> |
| In particular, shaping models always assume that every codepoint |
| in a text run has the same <span class="emphasis"><em>direction</em></span>, |
| <span class="emphasis"><em>script</em></span> tag, and |
| <span class="emphasis"><em>language</em></span> tag. |
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