Taking XML Validation to the Next Level: XSD Schema vs. CAM
The generic-sounding Content Assembly Mechanism, or CAM, is an exciting step beyond XML Schema, but it's new and not well documented. This is the second in a series of articles representing "CAM: The Missing Manual."
by Michael Sorens
March 13, 2009
n the first article in this series, you saw the rudiments of template-building and validation with CAM. This part of the series presents a much more detailed comparison between XML Schema and CAM.
Schema Validation
Because XML Schema is well-established, the tools for designing schema are considerably richer. CAM does not currently, for example, offer any graphical tools, whereas XML Schema has a wide variety. Probably the most well-known, XmlSpy, is an outstanding platform for XML development; however this article uses Liquid XML Studio for the examples and figures, because it's available in a free community edition. Figure 1 shows a graphical representation of the purchase order schema (see Listing 1) rendered by Liquid XML Studio. Note that it's far easier to grasp the structure of the schema from the graphical rendering than by reading the XSD file!
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