A version of the search page definitions for the site. Typically, an application passes the version value that was returned the last time the application executed this call. Filter that causes the call to return only the search pages for which the attribute meta-data has changed since the specified version. The latest version value is not necessarily greater than the previous value that was returned. Therefore, when comparing versions, only compare whether the value has changed.
See the
Field Index to learn which calls use AttributeSystemVersion.