anchor.diff:  
   The parameter `someChildren` is a query that matches some or all of the child documents.
   
  -Note that the query for `someChildren` should match only child documents or you may get an exception:
  +[CAUTION]
  +====
  +The query for `someChildren` should match only child documents or you may get an exception:
   
   [literal]
   Child query must not match same docs with parent filter. Combine them as must clauses (+) to find a problem doc.
   
  -In older version the error is:
  -
  -[literal]
  -child query must only match non-parent docs.
  -
   You can search for `q=+(parentFilter) +(someChildren)` to find a cause.
  +====
   
   Again using the example documents above, we can construct a query such as `q={!parent which="content_type:parentDocument"}comments:SolrCloud&wt=xml`. We get this document in response:
   
  
positive.code: </result>
  ----
  
  Note that the query for `someParents` should match only parent documents passed by `allParents` or you may get an exception:
  
  [literal]
  Parent query must not match any docs besides parent filter. Combine them as must (+) and must-not (-) clauses to find a problem doc.
  
  In older version the error is:
  
  [literal]
  Parent query yields document which is not matched by parents filter.
  
  You can search for `q=+(someParents) -(allParents)` to find a cause.
  
  === Block Join Parent Query Parser
  
  
negative.code: ----
  
  This example creates a phrase query with "foo" followed by "bar" (assuming the analyzer for `myfield` is a text field with an analyzer that splits on whitespace and lowercase terms). This is generally equivalent to the Lucene query parser expression `myfield:"Foo Bar"`.
  
  == Filters Query Parser
  
  The syntax is:
  
  [literal]
  q={!filters param=$fqs excludeTags=sample}field:text&
  fqs=COLOR:Red&
  fqs=SIZE:XL&
  fqs={!tag=sample}BRAND:Foo
  
  which is equivalent to:
  
  [literal]
  q=+field:text +COLOR:Red +SIZE:XL
  
  `param` local parameter uses "$" syntax to refer to a few queries, where `excludeTags` may omit some of them.
  
  == Function Query Parser
  
  