Codebook

Every element in the DDI DTD/Schema has the following attributes:

ID - This uniquely identifies each element.

xml-lang - Use of this attribute is deprecated, and it will no longer be supported in the next major version of the DDI specification. For newly created XML documents, please use xml:lang.

xml:lang - This attribute specifies the language used in the contents and attribute values of any element in the XML document. Use of ISO (www.iso.org) language codes is recommended.

source - This attribute identifies the source that provided information in the element. If the documentation contains two differing sets of information on Sampling Procedure -- one provided by the data producer and one by the archive where the data is deposited -- this information can be distinguished through the use of the source attribute.

Note also that the DDI contains a linking mechanism permitting arbitrary links between internal elements (See Link) and from internal elements to external sources (See ExtLink). Note that the use of these two elements has be DEPRECATED in version 2.6.