def child_url?(url1, url2, api = nil, strict: false)
      parent_url?(url2, url1, api, strict: strict)
    end
def child_url?(url1, url2, api = nil, strict: false)
      parent_url?(url2, url1, api, strict: strict)
    end
Returns true if the first URL is the child of the second URL
 @param url1 [Aspire::Caching::CacheEntry, String] the first URL
 @param url2 [Aspire::Caching::CacheEntry, String] the second URL
 @param api [Aspire::API::LinkedData] the API for generating canonical URLs
 @param strict [Boolean] if true, the URL must be a parent of this entry,
   otherwise the URL must be a parent or the same as this entry
 @return [Boolean] true if the URL is a child of the cache entry, false
   otherwise