https://www.php.net/alternative-syntax
PHP: Alternative syntax for control structures - Manual
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https://www.intel.com/content/www/us/en/docs/fortran-compiler/developer-guide-reference/2025-2/alternative-syntax-for-boh-constants.html
Alternative Syntax for Binary, Octal, and Hexadecimal Constants
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https://www.xml-sitemaps.com/forum/index.php/topic,9924/prev_next,prev.html
Custom alternative language pages syntax and hreflang links - Sitemap Generator Forum
Custom alternative language pages syntax and hreflang links
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