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Chapter 5. Declarative Content > Declarative Data Essence

5.6. Declarative Data Essence

The major organization concerned with content formats is the SMPTE. It has been working for some time to standardize the integration of various related content standards, including derivatives of HTML, CSS, and DOM. The DDE Ad-Hoc Group of the D27 Technical Committee of SMPTE has developed SMPTE 363M, also known as DDE-1 [DDE]. It standardizes some aspects of integration of iTV standards that provide basic functionality embodying current practice. The ATVEF specification was the basis for the DDE-1 effort.

DDE-1 specifies HTML 4.0, on which XHTML 1.0 is based, as well as CSS Level 1. CSS Level 2 includes features such as new pseudo-elements (e.g., the first letter of a paragraph), and new pseudo-classes (e.g., a link that has been visited). In addition, CSS2 specifies new types of selectors, such as attribute selectors, that can identify markup elements by the presence of an attribute and/or attribute value, and parent/child selectors which can identify markup elements based on parent/child relationships.


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