posted 22 years ago
The SYSTEM variant specifies the URI location of a DTD for private use in the document. the DTD is applied to all elements inside of root-element.
The PUBLIC variant is used in situations where a DTD has been publicized for widespread use. In those cases, the DTD is assigned a unique name, which the XML processor may use by itself to attempt to retrieve the DTD. If that fails, the URI is used.
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