Generally used by default within Grengine, unless a different source factory has been explicitly indicated.
If the builder's URL content tracking is set, {@link Source#getLastModified()}will be updated based on the URL content, within the latency period and only if queried. For this purpose, a hash of the URL content is cached internally for each URL source. @since 1.0 @author Alain Stalder @author Made in Switzerland.
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