.net upc-a reader

.net upc-a reader

.net upc-a reader

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An entity can be either text or binary (the parser tells them apart by how they're declared) There are two types of entities[md]general and parameter entities You use general entities as we've just seen above, enclosing references to them between & and ; Parameter entities may be used in the external part of the DTD, and in conditional sections (we'll examine conditional sections at the end of this chapter), you enclose references to parameter entities between % and ; Here's how you declare and use entities: EntityRef below is a reference to a general entity, and PEReference is a reference to a parameter entity: EntityDecl::= '<!ENTITY' S %Name S %EntityDef S '>'/* General entities */

| '<!ENTITY' S '%' S %Name S %EntityDef S '>'/* Parameter entities */

([^%&'] | PEReference | Reference)* "'"

Hex::= [0-9a-fA-F]

CharRef::= '&#' [0-9]+ ';' | '&#x' Hex+ ';'

EntityRef::= '&' Name ';' */

PEReference::= '%' Name ';' entities */

This, too, is valid, although the type attribute isn t assigned a value in the XML document Remember that the type attribute is declared with a default value Therefore, the parser automatically assigns the default value, which is retail, to the type attribute when the type attribute is assigned a value in the XML document

Note: As mentioned in the last chapter, any time you've seen a % in the declarations we've been working through, it means that a parameter entity can be used at that point

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Tip: If you use a parameter reference, the entity declaration must precede the reference to that entity Also, for all entity references, the reference must not include recursive reference to itself If you declare an entity more than once, only the first declaration is binding

If the entity is defined without any separate storage file, and the replacement text is given in its declaration, the entity is called an internal entity In the EntityValue term above, parameter entity references are recognized and expanded

immediately General entity references are not recognized at the time the entity declaration is parsed (they are expanded when you refer to the entity) In the replacement text of an internal entity, parameter entity references are expanded, but references to general entities are not expanded before the replacement text is stored in the parser's symbol table Also, it's worth noting that when a reference to a general entity is expanded in the document, the replacement text is parsed

If an entity is not internal, it must be external, and you declare it this way: ExternalDef::= ExternalID NDataDecl

If you supply a NDataDecl term, this entity is a binary data entity (otherwise it's a text entity) You can refer to binary entities only in attribute values declared to be of type ENTITY or ENTITIES Here's an example of a external entity declaration, where we declare the entity dataFFile to refer to the external file dataxml: <!ENTITY dataFile SYSTEM "dataxml">

Here's a declaration of an external binary entity, a gif file:

Note: If you use binary entities as above, you should declare the binary format[md]gif in the above example[md]with a notation declaration (coming up next)

As mentioned in the last chapter, there are several predefined entities in XML The predefined entities are: amp, lt, gt, apos, and quot These entities stand for the following characters respectively: &, <, >, ', and " If you use one of those entities in a document, and you want to keep the document valid, you must declare the entity, even though it's already predefined Here's how you declare these entities: <!ENTITY lt "<">

When you use one of these predefined entities in an XML document, they are replaced with the corresponding replacement text Now that we've covered the theory, let's see example of entities at work with the MSXML parser

In the DTD, we declare an entity named Number5 with the replacement text '5' When we refer to that entity in the document, the parser should replace that reference with the replacement text: < XML version="10" >

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