2.2.11 [W3C-P3P1.0] Section 5.3, The DATA-DEF and DATA-STRUCT elements
The specification states:
<DATA-DEF> and <DATA-STRUCT> Define a data element or a data structure, respectively. Data structures are reusable structured type definitions that can be used to build data elements. Data elements are declared within a <STATEMENT> in a P3P policy to describe data covered by that statement. The following attributes are common to these two elements: name (mandatory attribute) Indicates the name of the data element or data structure. Remember that names of data element and data structures are case-sensitive, so, for example, user.gender is different from USER.GENDER or User.Gender. Furthermore, in names of data elements and structures no number character can appear immediately following a dot. structref URI reference ([URI]), where the fragment identifier part denotes the structure, and the URI part denotes the corresponding data schema where it is defined. The default base URI is a same-document reference ([URI]). Data elements or data structures without a structref attribute (and, so, without an associated structure) are called unstructured. short-description a string denoting the short display name of the data element or structure, no more than 255 characters. The DATA-DEF and DATA-STRUCT elements can also contain a long description of the data element or structure, using the LONG-DESCRIPTION element.
All Document Modes (All Versions)
The DATA-DEF and DATA-STRUCT elements are not supported.