Prepare for 3.4.0 release
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+---
+
+released: false
+apache: true
+title: 3.4.0
+date: 2022-10-31
+summary: >
+ EXI binary XML support, pluggable character sets, embedded XML, C code
+ generator updates
+
+artifact-root: "https://dist.apache.org/repos/dist/dev/daffodil/3.4.0-rc1/"
+checksum-root: "https://dist.apache.org/repos/dist/dev/daffodil/3.4.0-rc1/"
+
+key-file: "https://downloads.apache.org/daffodil/KEYS"
+
+source-dist:
+ - "apache-daffodil-3.4.0-src.zip"
+
+binary-dist:
+ - "apache-daffodil-3.4.0-bin.tgz"
+ - "apache-daffodil-3.4.0-bin.zip"
+ - "apache-daffodil-3.4.0-bin.msi"
+ - "apache-daffodil-3.4.0-1.noarch.rpm"
+
+scala-version: 2.12
+---
+
+#### EXI Support
+
+The Daffodil CLI adds two new infoset types--`-I exi` and `-I exisa`--to
+support infosets represented as EXI binary XML for non-schema aware and schema
+aware EXI, respectively. EXI infosets are significantly smaller in size than
+normal XML infosets, and are often even smaller than the original data format
+when made schema aware. This support has been enabled with the
+[Exificient](https://exificient.github.io/) library.
+
+API users can create EXI files using the existing `SAXInfosetInputter` and
+`SAXInfosetOutputter` classes and the Exificient SAX API. This has also been
+tested with the Agile Delta EXI SAX API. Schema aware EXI can be enabled using
+the `DaffodilXMLEntityResolver`, newly added to Java and Scala public APIs.
+
+* {% jira 1959 %} EXIficient Inputter and outputter for XML EXI representation
+* {% jira 2739 %} Expose DFDLCatalogResolver to the public API
+
+#### Pluggable Character Sets
+
+Custom character sets can now be added to Daffodil by implementing a custom
+`BitsCharsetDefinition` class and related functions/classes, listing it in a
+`META-INF/services` file, packaging it into a jar, and adding it to the
+Daffodil classpath.
+
+* {% jira 2663 %} charset encoders need to be pluggable (doc needed)
+
+#### Embedded XML in the Infoset
+
+When using the `XMLTextInfosetInputter` and `XMLTextInfosetOutputter` in the
+API, or `-I xml` in the CLI, simple string elements with the DFDL extension
+attribute of `dfdl:runtimeProperties="stringAsXml=true"` are treated as XML.
+This means that when parsing, instead of outputting the content as an XML
+escaped string, the parsed content is checked to be valid XML and output as if
+it were part of the XML infoset. When unparsing, the XML part of the infoset is
+converted back to a string. Note that because there are multiple ways to read
+and write XML that are syntactically different but semantically the same, it is
+possible that parsed or unparsed data may differ from the original data.
+
+* {% jira 2708 %} XML String feature in XML Text Infoset Inputter/Outputter
+
+#### C Code Generator (Runtime2) Updates
+
+The C code generator backend now supports reading and writing N-bit booleans
+and integers, where N is an explicit length from 1 to 64 bits. Additional
+miscellaneous changes include unit test support, fixes to nested choices, and
+tweaks to how float numbers are output.
+
+* {% jira 2696 %} Extend runtime2 to N-bit booleans and integers (1 <= N <= 64)
+
+#### Additional New Features/Improvements
+
+* {% jira 2357 %} Update recoverable error to not be an SDW
+* {% jira 2369 %} TDML language needs comment syntax in documentPart byte and bits
+* {% jira 2685 %} Upgrade Scala XML library to 2.1.0 version
+* {% jira 2697 %} Choose TDML implementation to run TDML tests
+* {% jira 2702 %} Eliminate build warning on VSCode scala build of Daffodil
+* {% jira 2719 %} Add tests to illustrate some nillable and fixed-length scenarios
+* {% jira 2723 %} Change DataProcessor.copy() method to public
+* {% jira 2725 %} TDML runner needs to support pre-compiled DFDL schema
+
+#### Miscellaneous Bug Fixes
+
+* {% jira 2237 %} XML comment not allowed inside dfdl:defineEscapeScheme
+* {% jira 2488 %} When executing a parse command with the debugger get incorrect result for display info unparser
+* {% jira 2616 %} End-user doc of how import/include schemaLocation resolver works
+* {% jira 2654 %} java.util.NoSuchElementException: head of empty list on commented out includes/choice branches
+* {% jira 2680 %} Add new transitive deps' NOTICE to Daffodil's bin.NOTICE
+* {% jira 2682 %} Update copyrights to 2022
+* {% jira 2693 %} Add Adam Rosien to https://daffodil.apache.org/people/
+* {% jira 2701 %} Facet checks throw exception for non-numeric float/double values
+* {% jira 2704 %} sbt tests are intermittenly hanging
+* {% jira 2710 %} build.md instructions fail for RedHat - no mxml-devel
+* {% jira 2713 %} Release candidate container has poor cacability and reproducability
+* {% jira 2717 %} unparser deadlocks in mil-std-2045 2-message file case
+* {% jira 2726 %} Index out of bounds -1 during unparsing
+
+#### Deprecation/Compatibility
+
+* `dfdl:assert`'s with `failureType="recoverableError"` are now reported as
+ validation errors instead of schema definition warnings {% jira 2357 %}
+
+* All `InfosetInputter` and `InfosetOutputter` functions now return `Unit`
+ instead of `Boolean`. Errors are now expected to be thrown as exceptions
+ {% jira 2721 %}
+
+#### Dependency Changes
+
+The following dependencies have been added or updated:
+
+**Core**
+
+* FasterXML Jackson Core 2.13.4 <small>(update)</small>
+* FasterXML Woodstox Core 6.4.0 <small>(update)</small>
+* ICU4J 72.1 <small>(update)</small>
+* Log4j API 2.19.0 <small>(update)</small>
+* Scala XML 2.1.0 <small>(update)</small>
+
+**Command Line Interface**
+
+* Exificient 1.0.4 <small>(new)</small>
+* Log4j Core 2.19.0 <small>(update)</small>
+
+**Schematron Validator**
+
+* Saxon-HE 11.4 <small>(update)</small>
+
+**Test**
+
+* Scalacheck 1.17.0 <small>(update)</small>
