VercatusGrade AR-164Technical
Sitemaps containing current indexable canonical URLs
A sitemap is a hint: submitting it does not guarantee that Google downloads it or uses it for crawling. It should list the canonical URLs you want shown in search. Google ignores priority and changefreq and uses lastmod only when it is consistently and verifiably accurate. A single sitemap is limited to 50,000 URLs or 50 MB (52,428,800 bytes) uncompressed.
Sources
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AGrade A: official documentation or a standard. A grade describes the provenance of the sources above; it is not a probability that a change will work. The effect basis says how the size of the effect is known: measured by a study, taken from an industry report, only documented without a size, or not quantified.
Put this evidence to work
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