sitemap.xml validation could be more loose (Example inside)

[heysamtexas]

Have a look at this sitemap: https://blockworks.co/price-sitemap-index.xml

we currently validate on the first line from the sitemap_grabber library:

sitemap_grabber/sitemap_grabber/sitemap_grabber.py

Line 69 in 029817e

def _is_sitemap(content: str = None) -> bool:

its output below from https://blockworks.co/price-sitemap-index.xml :