XML by Example

Listing 4.5: continued

<qa-rating>5 stars</qa-rating>

<pa-rating>G</pa-rating>

<name>Fatbrain.com</name>

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

<qa-rating>4 stars</qa-rating>

<pa-rating>G</pa-rating>

<name>ABC News</name>

<link href=”http://www.abcnews.com”/>

<qa-rating>3 stars</qa-rating>

<pa-rating>PG</pa-rating>

</references>

Namespaces

The problem outlined in the previous example is… the extensible character

of XML. There is no way to prevent somebody from extending a document

in a way that is incompatible with other works. That’s the nature of exten-

sibility. Because anybody can create tags, there is a huge risk of conflicts.

One solution to prevent conflicts ...