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To start working with functioning XML documents in the last chapter, we saw how to declare XML elements, but haven't yet worked with other XML declarations, such as entity declarations or attribute lists In this chapter, we'll work with the above XML definitions in more depth, filling out our XML skills We'll see how what the EncodingDecl and RMDecl terms do in the XML declaration: XMLDecl::= '< XML' VersionInfo EncodingDecl RMDecl S ' >'

We'll also examine the other large part of the XML specification in more detail than we have before [md]how to declare elements, attribute lists, entities, notations, and conditional sections: doctypedecl::= '<!DOCTYPE' S Name (S ExternalID)

S ('[' markupdecl* ']' S ) '>'

%NotationDecl | %conditionalSect | %PI | %S | %Comment )* )

When we're done with this chapter, we will have completed our coverage of Part I of the XML specification Let's start by examining the EncodingDecl term, which specifies the legal character encodings in XML

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The character encoding of a document specifies the character set you want to use; you can specify the character encoding you want to use in an XML document In fact, each text entity in an XML document can use a different encoding You can specify the character encoding for the whole document in the + part of the Prolog (note that specifying the character encoding is optional): document::= Prolog element Misc*

Prolog::= XMLDecl Misc* (doctypedecl Misc*)

XMLDecl::= '< XML' VersionInfo EncodingDecl RMDecl S ' >'

All XML parsers must be able to read text in either the standard UTF-8 or UCS-2 formats (XML entities encoded in UCS-2 must begin with the UCS-2 Byte Order Mark) Here's how the encoding declaration works, in case you want to make use of it: EncodingDecl::= S 'encoding' Eq QEncoding

QEncoding::= '"' Encoding '"' | "' " Encoding "'"

LatinName::= [A-Za-z] ([A-Za-z0-9_] | '-')*

The element_name is the name of the tag, and its child data are placed within the parentheses Here s the declaration of the customer element, which you used previously in this chapter The customer element consists of seven child elements

The most common encodings are values UTF-8, UTF-16, ISO-10646-UCS-2, and ISO10646-UCS-4 Here's an example of an encoding declaration: < XML ENCODING='UTF-8' >

The character encoding is one (optional) part of the XML declaration; another part is the (also optional) required markup declaration

In the + part of the XML declaration, you can specify whether a DTD is required to work with your XML document: document::= Prolog element Misc*

Prolog::= XMLDecl Misc* (doctypedecl Misc*)

XMLDecl::= '< XML' VersionInfo EncodingDecl RMDecl S ' >'

This is the RMD (Required Markup Declaration) section of the XML declaration, and you can specify whether there is no DTD, whether it's internal, or whether the parser should use both internal and external DTDs (if provided): RMDecl::= S 'RMD' Eq "'" ('NONE' | 'INTERNAL' |

Yes, You Can!

'ALL') "'" | S 'RMD' Eq '"' ('NONE' | 'INTERNAL' | 'ALL') '"'

The value NONE means the parser doesn't need the DTD to read the document; INTERNAL means the parser must read the internal DTD (if there is one); if the value is ALL, the parser must read both internal and external DTDs, if provided

Here's an example XML declaration with a Required Markup Declaration: + That completes the XMLDecl section of the Prolog: Prolog::= XMLDecl Misc* (doctypedecl Misc*)

However, we still have a great deal to cover in the doctypedecl section of the Prolog[md]that is, the DTD In the rest of this chapter, we'll examine how DTDs work and the types of declarations you can use in them: doctypedecl::= '<!DOCTYPE' S Name (S ExternalID)

S ('[' markupdecl* ']' S ) '>'

%NotationDecl | %conditionalSect | %PI | %S | %Comment )* )

We already know what a DTD is for: using a DTD, you can specify a grammar for your XML document, indicating to the XML parser what tags you allow in your document, what order they

come in, and what tags other tags can enclose The MSXML parser does not require a DTD, but if you include one, it will use it to make sure the XML document is valid Here's how the DTD is defined: doctypedecl::= '<!DOCTYPE' S Name (S ExternalID)

S ('[' markupdecl* ']' S ) '>'

%NotationDecl | %conditionalSect | %PI | %S | %Comment )* )

An element that contains character data is declared similarly, except #PCDATA is placed between the parentheses (PCDATA is an acronym for Parsed Character Data) Here s the way you declare this type of element:

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