DCD???

希望合用 !

香港天龙的一套最新组合，
DENON DCD-SA1 SACD/CD 播放机和PMA-SA1 的合并扩音机，
现在为大家写了一个简短的报告和各位分享一下 ，

DENON 于93年出了一套 S1 系列，在一众两声道发烧友心中于当年做成一阵回响，也使很多人对DENON这日本品牌刮目相看。

先介绍DCD-SA1，它是一台能够播放SACD 和 CD 的播放机，虽然直到今天，
SACD 制式是否可以完全取代CD还是一个未知之数，但对我们一众发烧友来讲，SACD愈出愈多，已是一个不争的事实，所以有一台SACD/CD 播放机在家，总会比一个纯CD播放机来得开心好玩。


This document proposes a structural schema facility, Document Content Description (DCD), for specifying rules covering the structure and content of XML documents. The DCD proposal incorporates a subset of the XML-Data Submission [XML-Data] and expresses it in a way which is consistent with the ongoing W3C RDF (Resource Description Framework) [RDF] effort; in particular, DCD is an RDF vocabulary. DCD is intended to define document constraints in an XML syntax; these constraints may be used in the same fashion as traditional XML DTDs.

The Document Content Description facility for XML (abbreviated DCD) is an RDF vocabulary designed for describing constraints to be applied to the structure and content of XML documents. The abbreviation "DCD" is used to describe both the general facility described in this document and individual schema instances that conform to it.

DCD is based on the following design principles:

DCD semantics shall be a superset of those provided by XML DTDs.
The DCD data model and syntax shall be conformant with that of RDF.
The constraints in a DCD shall be straightforwardly usable by authoring tools and other applications which wish to retrieve information about a document's content and structure.
DCD shall use mechanisms from other W3C working groups wherever they are appropriate and efficient.
DCDs should be human-readable and reasonably clear.