Description:
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 (Link) and from internal elements to external sources (ExtLink).
The top-level element, codeBook (0.0) also includes a version attribute to specify the version number of the DDI specification.
Mention of formatting elements: p, emph, list, itm, etc.???