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How Our Sitemap Software Detects Page Language

Correct identification of the primary language on a page can be useful for alternate hreflang information in sitemaps.

Page Language Detection in A1 Sitemap Generator

Our software determines the primary page language by checking the following things:
  1. Checks if the webserver responds with content-language HTTP response header:
    • PHP pages: Insert this code <?php header("Content-Language: en"); ?>.

  2. The page is checked for content-language META tag:
    <meta http-equiv="content-language" content="en">

  3. The page is checked for lang inside the HTML tag:
    <html lang="en">

  4. The page is searched for Open Graph Protocol attribute property og:locale inside META tags.

  5. The page is checked for xml:lang inside the HTML tag:
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">

  6. The page is checked for alternate / hreflang inside the link tag:
    <link rel="alternate" href="http://example.com/name-of-page.html" hreflang="en">

  7. The page URL is checked for common language/culture and country codes.

    Note: This requires enabling option Scan website | Data collection | Inspect URLs to detect language. For more info see:
  8. Planned: Compare content against word lists for each language. Select best match.

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As one of the lead developers, his hands have touched most of the code in the software from Microsys. If you email any questions, chances are that he will be the one answering.
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