# X4O

X4O is not an XML parser but a recursive self configuring XML dialect language library.

X4O is very old code from pre 1.5 non-generics nice object java.

## 2025 TODO

- Add 18 bit SAX4 XML read and write support
- RM 8 bit String DEP, replace javax.el by simple obj map
- Upgrade X4O element language to support 18 bit XML
- Remove some features to ease "write" and SAX4 support
- Move all XML uri's to oasis style thus replacing all internal http namespace locators
- Add jaxb annotation support to define a x4o language and have XSD and documention tools
- (DONE) Remove SAXException and replace with IOException for auto close tag printer API support
- Cleanup old todo/ideas from below

## OLD todo

- Fix debug output
- RM function methods from Element interface
- finish eld doc-output content
- Make generic/safe? config bean
- - Make language config done by driver xml parser
- change (internal) x4o language to "x4o-" prefix so; x4o-cel,x4o-eld,x4o-meta
- Add language locking, and lock eld/cel and add <lang>-eld wrap language for eld extentions per language
- Add doc version upgrade handler
- - per version step xslt doc upgrade (check dyna sax piplining hooking)
- - per version eld + support code + backing objects (DONE) 
- - per version eld for dyna tree convert to new backing objects
- Add *Local layer for X4OLanguage* classes
- Add default define (EL) layer
- Bring back xml read+write streaming language support
- static field constant converter
- add default list and map converter/handler
- full Xinclude test
- move loading back into sax phase so version can readout on root tag
- tag aliases
- [lang]-el-beans.xml loading
- Add XML schema tags to ELD
- Auto generate schemas from eld
- Basic editor support
- Make converter config/loading better
- Single xsd output
- class dtd entity loadings
- new ns for entity catalog for class resource
- Add w3c html namespace in eld for description tag
- move Boolean default from code to xml + conf

### OLD IDEAS

- add mini xslt parse on top of streaming api
- add support javax.xml.xpath for xpath support
- add java.script support
- event listeners on all DOM tree element operations
- custom and merga'ble parse phases for speed
- make element tree jdom api compatible
- Test if possible to use threadpool for executing phases

test v2;
- x4o-driver
- x4o-s4j-jaxp (dom,sax,stax,xslt) (jsr; 5,63,173)
- x4o-s4j-sax
- x4o-s4j-stax
- x4o-s4j-jaxb (jsr; 222)

### OLD v1 todo NON-CODE

- Add tutorial
- doc eld and x4o lang files

### OLD v1 todo CODE

- Add (super) tag for extending tags of other namespace
- XMLOverrideEvent
- - inboud sax parser !!
- - input stream output converter :)
- eld static method binding for EL
- (50%) converters
- more junit tests
- - multi and overrides in namespaces
- - localoverride
- (DONE) multi phase parsing
- - for loop support
- - templateing.
- - merging of object tree's
- - sax with all x4o feutures like templating
- x4o:include option
- - Xinclude option
- - SAX events as input source
- (70%) XML debug output

## OLD versions

Version 0.8.7:
- Created jdk7(CSS) javadoc compatible documentation
- Create language task api and converted the current tasks
- Renamed X4OLanguageContext to X4OLanguageSession
- Renamed ElementNamespaceContext to ElementNamespace
- Removed binding handler from element interface
- Refactored all property keys with PropertyConfig bean
- Change global attr to namespace attributes
- Updated ant/maven plugins to new task and properties
- Added options to xml writer like OUTPUT_LINE_BREAK_WIDTH

Version 0.8.6:
- Changed to X4ODriver interface
- Added (simple) write support
- Added ant and maven plugins

Version 0.8.5:
- Made module loading system
- Added eld to schema generator
- Added eld to html generator
- Cleaned xml uri nameing
- refactored ELD tag names
- Made elddoc ~working
- Changed phase enum to text phases

Version 0.8.0:
- Changed packages to org.x4o
- Made converter two way 
- Added debug writer