anchor.diff:  
   The value of `query` can be a single query, or a JSON list of queries.  Each query can be:
   
  -* a string containing a query in Solr query syntax
  -* a reference to a request parameter containing Solr query syntax, of the form: `{param : <request_param_name>}`.
  +* a string containing a query in Solr query syntax.
  +* a reference to a request parameter containing Solr query syntax, of the form: `{param: <request_param_name>}`.
   The referred parameter might have 0 (absent) or many values.
  -** When no values specified, no error is thrown
  -** When many values are specified, each value is parsed and used as queries
  +** When no values are specified, no error is thrown.
  +** When many values are specified, each value is parsed and used as queries.
   
   NOTE: While a `query` domain can be combined with an additional domain `filter`, It is not possible to also use `excludeTags`, because the tags would be meaningless: The `query` domain already completely ignores the top-level query and all previous filters.
   
  
positive.code: 
  The value of `filter` can be a single query to treat as a filter, or a JSON list of filter queries.  Each query can be:
  
  * a string containing a query in Solr query syntax
  * a reference to a request parameter containing Solr query syntax, of the form: `{param : <request_param_name>}`.
  The referred parameter might have 0 (absent) or many values.
  ** When no values specified, no filter is applied and no error is thrown
  ** When many values are specified, each value is parsed and used as filters
  
  When a `filter` option is combined with other `domain` changing options, the filtering is applied _after_ the other domain changes take place.
  
  
negative.code: ====
  --
  
  The value of `excludeTags` can be a single string tag, an array of string tags, or comma-separated tags in the single string.
  
  When an `excludeTags` option is combined with other `domain` changing options, it expands the domain _before_ any other domain changes take place.
  
  