title: What is the precision of the priority field in sitemap.xml?
body: <p>Unfortunately the <a href="http://www.sitemaps.org/protocol.php#prioritydef" rel="nofollow noreferrer">specification</a> does not tell anything about precision.
  The <a href="http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" rel="nofollow noreferrer">xml scheme definition</a> states that it is of the type <code>xsd:decimal</code>:</p>
  
  <pre><code>&lt;xsd:restriction base="xsd:decimal"&gt; 
    &lt;xsd:minInclusive value="0.0"/&gt; 
    &lt;xsd:maxInclusive value="1.0"/&gt; 
  &lt;/xsd:restriction&gt; 
  </code></pre>
  
  <p>I have a sitemap generator that uses up to 10 positions after decimal point.
  Where often only the last few positions differ. These numbers are perfectly right according to the xsd, but yet i found some pages(<a href="http://www.microsystools.com/products/sitemap-generator/tutorials/xml-sitemap-priority-tag.php" rel="nofollow noreferrer">3</a>,<a href="http://www.xml-sitemaps-generator.com/xml-sitemaps-and-priority-values/" rel="nofollow noreferrer">4</a>) that state that only 0.0, 0.1, 0.2, .., 1.0 are valid values.</p>
  
  <p>How will the search engines react to such a sitemap? Will some just round the value?</p>
  
  <p>I know that it is unlikely that someone can provide an answer to that question, unless he works for that search engine, but i think experiences will also do.</p>