changefreq
Optional. Either a method or attribute.
If it’s a method, it should take one argument – an object as returned by items() – and return that object’s change frequency as a string.
If it’s an attribute, its value should be a string representing the change frequency of every object returned by items().
Possible values for changefreq, whether you use a method or attribute, are:
'always''hourly''daily''weekly''monthly''yearly''never'
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