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XML Document Preambles

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The book that I am using to learn XML states a few times that every XML document with an external DTD or schema must have a preamble that points to the content model. However, I have seen a couple of XML documents that don't have a preamble. Is there another method of declaring the content model besides using a preamble? Also, does anyone know of an online tutorial I can use to figure out how to make use of XML document information within my Java program?
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Richard, what your book means by �a preamble�? The closest official term I can think about is �prolog� = �XML declaration� + �DOCTYPE declaration�. Is it what the book mean? If XML document has a DTD (either external or internal), it has to be declared in <!DOCTYPE declaration
But it is also possible for an XML document not to have any accotiated DTD or Schema � then it doesn�t have <!DOCTYPE declaration (= preamble?)
Some ideas about Java&XML:
Processing XML with Java
XML, Java, databases and the Web
Java XML Application Categories
It is sorta covered in the JavaRanch Style Guide.
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