anchor.diff:  
   * In the XML query parser (`defType=xmlparser` or `{!xmlparser ... }`) the resolving of external entities is now disallowed by default.
   
  +If you are upgrading from a version earlier than Solr 7.0, please see <<major-changes-in-solr-7.adoc#major-changes-in-solr-7,Major Changes in Solr 7>> before starting your upgrade.
  +
   == Upgrading to 7.x from Any 6.x Release
   
   The upgrade from Solr 6.x to Solr 7.0 introduces several *major* changes that you should be aware of before upgrading. Please do a thorough review of the section <<major-changes-in-solr-7.adoc#major-changes-in-solr-7,Major Changes in Solr 7>> before starting your upgrade.
  
positive.code: 
  == Upgrading to 7.x Releases
  
  === Solr 7.3
  
  See the https://wiki.apache.org/solr/ReleaseNote73[7.3 Release Notes] for an overview of the main new features in Solr 7.3.
  
negative.code: 
  * The top-level `<highlighting>` element in `solrconfig.xml` is now officially deprecated in favour of the equivalent `<searchComponent>` syntax. This element has been out of use in default Solr installations for several releases already.
  
  If you are upgrading from a version earlier than Solr 7.2, please see previous version notes below.
  
  === Solr 7.2
  
  See the https://wiki.apache.org/solr/ReleaseNote72[7.2 Release Notes] for an overview of the main new features in Solr 7.2.
  