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Only generate an attribute prefix if required #30

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Only generate an attribute prefix if required #30

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18 changes: 13 additions & 5 deletions index.html
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Expand Up @@ -1359,19 +1359,27 @@ <h2>Extensibility</h2>
"<code>xmlns</code>".
</ol>

<li>Otherwise, the <var>attribute namespace</var> in not the <a>XMLNS namespace</a>. Run
these steps:
<li>Otherwise, the <var>attribute namespace</var> is not the <a>XMLNS namespace</a>. If
<var>candidate prefix</var> is null, run these steps:
<ol>
<li>Let <var>candidate prefix</var> be the result of <a>generating a prefix</a> providing
<var>map</var>, <var>attribute namespace</var>, and <var>prefix index</var> as input.
<li>Let <var>new prefix</var> be <var>attr</var>'s <code><a>prefix</a></code> attribute if it is
not <code>null</code> and the <var>local prefixes map</var> does not contain a key matching
<var>attr</var>'s <code><a>prefix</a></code>, or the result of <a>generating a prefix</a> providing
<var>map</var>, <var>attribute namespace</var>, and <var>prefix index</var> as input otherwise.

<li><a>Add</a> <var>new prefix</var> to <var>map</var> given namespace <var>attribute namespace</var>.

<li>Add the value of <var>new prefix</var> as a new key to the <var>local prefixes map</var>, with
the <var>attribute namespace</var> as the key's value replacing the value of <code>null</code> with
the empty string if applicable.

<li>Append the following to <var>result</var>, in the order listed:
<ol>
<li>"<code> </code>" (U+0020 SPACE);

<li>The string "<code>xmlns:</code>";

<li>The value of <var>candidate prefix</var>;
<li>The value of <var>new prefix</var>;

<li>"<code>="</code>" (U+003D EQUALS SIGN, U+0022 QUOTATION MARK);

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