Added automatic builds
Each day a ZIP-file is created via cron.
The builds consist of XMI, XSD, DocBook, PDF and graphs in dot, svg and png.
Added basic validation for names
installed module for validation, some rules for object and package names have been defined.
Added help for creating and managing the model
Guidelines for naming and propeties.
Added stage-tagging for objects
Re-arranged "Status" and added field for Stage, filter added on objects page.
Changes for Datatype
Datatype taxonomy is replaced by a datatype content type, to create a new one go to /node/add/datatype. You can specify basic documentation of the datatype and specify enumerated values. A datatype must be placed in a package.

Welcome to the development platform for the next generation of DDI

The DDI Alliance is building a new model-based specification, for more information on the background to this see, the process and what we hope to achieve see the DDI Alliance website at

A site to hold discussions and further ongoing discussion is at


A Conceptual Domain defined by an expression.For example: All real numbers between 0 and 1. [GSIM 1.1}


The data type of the variable



Set of valid Concepts. The Concepts can be described by either enumeration or by an expression.[GSIM 1.1]


The object of interest in a Research Activity


The use of a represented variable within a LogicalDataDescription. It may include information about the source of the data. [GSIM 1.1].


Logical Data Description covers the logical content of a dataset - the "variable cascade".


A value.


ImplementedInstruments are mode and/or unit specific.


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