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XML Schema entry point:
http://www.ddialliance.org/Specification/DDI-CDI/1.0/XMLSchema/ddi-cdi.xsd 


RDF Namespace
http://www.ddialliance.org/Specification/DDI-CDI/1.0/RDF/

DDI-CDI URIs e.g. for classes and properties will resolve by default to field-level documentation. 
The following RDF serialisations are available by specifying the content type type in the HTTP Accept header:  
application/ld+json and text/turtle.


DDI-CDI has three main components. The first one supplies a rich set of foundational metadata for variables, classifications, and other concepts and representations. The second one describes data in rectangular (wide), long (event), multi-dimensional (cube), and no-SQL (big data) data formats. The third one describes process as the primary aspect of data provenance.

 For the DDI suite of metadata standards, DDI-CDI provides a new and expanded focus. Interdisciplinary research brings challenges in establishing trust and transparency for the sources and combination of cross-domain data. Ultimately, these diverse types of data must be seen as an integrated whole for research outputs, complete with a description of the structure, meaning, and provenance of each part. DDI-CDI meets this need.

The UML Model

The core of DDI-CDI is a model described using the Unified Modeling Language (UML). It is expressed in Canonical XMI, an exchange format for UML models which has been tested to work with many different UML tools. The subset of UML features conforms to the UML Class Model Interoperable Subset (UCMIS) guidelines, which further constrain the features to guarantee greater interoperability

Informational Documentation

The DDI-CDI specification has an extensive overview document, and browsable field-level documentation which also provides information about the XMI description and the syntax representations for XML and RDF encodings.

Encodings 

The current encodings and syntax representations provided for the version 1.0 are:

Markup Examples