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### New Features

• Implemented the Arrow Operator (=>) from XQuery 3.1
• Implemented String Constructors from XQuery 3.1
• Implemented fn:has-children, fn:innermost, and fn:outermost functions from XQuery 3.1
• Extended the Range Index conditions feature

### Performance Improvements

• FLWOR where clauses are no longer evaluated for empty sequences, resulting in significant speed increase

### Critical Bug Fixes

• Fixed the shutdown timer
• Improved EXPath Package repository stability in cases of failures or corruption
• Replaced some additional read locks with write locks where required
• AuditTrailSessionListener now releases locks correctly
• Variable names without namespace prefix are now correctly in no namespace

### Clean Up and Refactoring

• Refactored many tests
• Simplified the sql:execute function and corrected the encoding of its results
• Function definitions are no longer shared between deferred function calls
• All FLWOR clauses except where clauses are now pre-evaluated
• Added tests for range index conditions
• IntelliJ, NetBeans, and Eclipse configuration files cleaned up
• Map and Array constructors are now inlined in grammar
• Improved the Lookup Operator (?) for postfix expressions with Maps from XQuery v3.0
• Continued clean up of eXist-db's Test Suite
• Added integration tests to ensure EXPath Package functionality and further support the trimming of the core
• Extended use of SystemExitCodes instead of explicit integers
• Improved the service wrapper (yajsw) introduced in v3.0
• Made the ft:query-field only depend on context sequence
• Removed support for Launch4j exe creation
• Fixed short form of shutdown arguments
• Upgraded 3rd party libraries:
  • log4j2
  • Switched to use Jargo instead of defunct Excalibur (and Guava)
• ... and many more

### Backwards Compatibility

• eXist-db v3.1.0 is binary-compatible with v3.0 but not with previous versions. Users upgrading from previous versions should perform a full backup and restore to migrate their data.
• eXist-db v3.1.0 and v3.0 require Java 8.
• Due to the legacy Full Text Index being removed, the text XQuery module (http://exist-db.org/xquery/text) has also been removed. Users should now rely on the fn:analyze-string function, e.g.:
  • Instead of using text:groups(), use analyze-string()//fn:group,
  • Instead of text:filter("apparat", "([pr])"), use analyze-string("apparat", "([pr])")//fn:match/string()
• There have been changes to some internal APIs, e.g., XQueryService has been moved from DBBroker to BrokerPool.
• EXPath Packages that incorporate Java libraries may no longer work with eXist-db v3.1.0 and may need to be recompiled for our API changes; packages should now explicitly specify the eXist-db versions that they are compatible with.

### Downloading This Version

eXist-db v3.1.0 is available for download from GitHub. (The older Sourceforge download page is no longer updated.) Maven artifacts for eXist-db v3.1.0 are available from our mvn-repo. Mac users of the Homebrew package repository will be able to install and upgrade shortly; an announcement will be made on the exist-open mailing list.