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document to display the data on a customer's computer, another to display it on salesper-
sons' computers, another to display it on mobile devices when art buyers are on the road, and
so forth. Given these XSLs, customer data can be displayed regardless of whether they came
from one gallery or the other.
Now, broaden this idea from two small businesses to an industry. Suppose, for example,
that the real estate industry agrees on an XML Schema document for property listings. Every
real estate company that can produce data in the format of the schema can then exchange list-
ings with every other real estate company. Given the schema, each company can ensure that
it is transmitting valid documents, and it also can ensure that it is receiving valid documents.
Figure 11-60
Customer Purchases
(a) XML Schema
(
continued
)
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