Summary
In this chapter, we've looked at how we can implement validation within an individual service through a combination of XSD validation, Schematron, and Business Rules.
Ideally we should use XSD validation to check the overall sanity of the data, but in order to provide a greater level of flexibility, we then extract the business-specific validation into a separate component such as Schematron. This gives us more flexibility to change the validation for a component without the need to redeploy a new version of it.
In situations where Schematron can't provide the required validation, we've looked at how we can use Business Rules to build this into the underlying service implementation, again giving us the flexibility to change the validation ...
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