XML by Example

xmlns:sub=”http://penguin.xmli.com/subscription/1.0”>

<name sub:subscription=”$0.0”>Pineapplesoft Link</name>

<link href=”http://www.pineapplesoft.com/newsletter”/>

</references>

Namespaces and DTD

If the document is a valid document, that is if it has a DTD, the prefix and

the attributes for namespace declaration must be declared in the DTD.

Listing 4.10 illustrates how it works.

Listing 4.10: Declaring the Namespace Prefix in the DTD

<?xml version=”1.0” standalone=”yes”?>

<!DOCTYPE rff:references [

<!ELEMENT rff:references (rff:name,rff:link)+>

<!ATTLIST rff:references xmlns:rff CDATA #REQUIRED>

<!ELEMENT rff:name (#PCDATA)>

<!ELEMENT rff:link EMPTY>

<!ATTLIST ...