NeXML is a proposed data exchange standard for phylogenetics that addresses issues with the current NEXUS format. It defines an XML schema for representing phylogenetic data like trees, networks, and character data. The schema is designed to be extensible, reuse prior standards, and take advantage of existing XML tools. An implementation includes XML parsers and writers in multiple programming languages and experiments with semantic annotation and web services.

1. NeXML A future data exchange standard for phylogenetics Rutger Vos University of British Columbia

2. Increased automation in evolutionary informatics is hampered by poorly defined “standards” Introduction (1/7) The problem Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

3. Addressing interoperability problems by coding our way out of it Introduction (2/7) EvoInfo interests Syntax: NeXML Semantics: CDAO Transport: PhyloWS Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

12. Design (4/5) Inheritance IDTagged (required id attribute) Labelled (optional label attribute) Annotated (optional dict elements) Base (optional base/lang/href attributes) AbstractElement (in root schema) ConcreteElement (in instance document) extends extends extends extends restricts Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

15. Implementation (2/6) Entity relationships Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

16. Implementation (3/6) inheritance tree for elements Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

17. Implementation (4/6) anatomy of a “block” <characters id=&quot;c1&quot; xsi:type=&quot;nex:DnaSeqs&quot; otus=&quot;t1&quot;> </characters> <dict> <key>desc</key> <string>description … </string> </dict> Contents… Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

18. Implementation (5/6) Character Classes RestrictionCells RestrictionSeqs Restriction ContinuousCells ContinuousSeqs Continuous StandardCells StandardSeqs Standard ProteinCells ProteinSeqs Protein RnaCells RnaSeqs RNA DnaCells DnaSeqs DNA Cells Sequence Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources

19. Implementation (6/6) Tree Classes IntTree FloatTree Tree IntNetwork FloatNetwork Network Int Float Introduction The problem EvoInfo interests This subproject Nexus issues Parsing Extensibility XML goodies Design Principles Re-use Patterns Inheritance References Implementation Approach ERD Inheritance Anatomy Characters Trees Current status Schema blocks Parsers & writers Experiments To do Resources