Re: Where have the element types gone?
Eric van der Vlist wrote: > > Ronald Bourret wrote: > > 1) Before we had namespaces, you made an assumption about the data type > > of the element based on its name, which might not have been universal. > > > > 2) After we had namespaces, and you chose to use them, you made an > > assumption about the data type of the element based on its name, which > > was "guaranteed" to be universal. > > > > 3) After we had schemas (and simple and complex types), you can still do > > (1) -- which is what you have done here -- or (2). You also have the > > additional ability to query the data type at run time if the schema is > > available. > > Yes, I was just complaining that people were usinf (3) without > considering using (2) in cases where (3) doesn't bring added value. A valid complaint. I would think (2) is sufficient for most people. (3) is necessary for people writing generic, schema-driven apps. It is also useful for people who feel it is safer in the long run to write schema-driven code, even in apps that use a single schema. (The advantage of such code is that you can often change the schema -- such as changing a data type from int to long -- without changing the code.) > More precisely in this case, if you are using (3) you can't use (2) > -since the namespace which is used is different- any longer and your > alternate solution is (1). I'm not sure I understand this. Do you mean that if you base code decisions at run time off of data types you (obviously) can't base them off element type names? If so, I agree. On the other hand, if you mean that the act of writing a schema you can't base code decisions on element type names, then I disagree. You clearly can -- you are simply hard-coding your schema into your application. (I don't see what namespaces have to do with this. It's a simply a question of recognizing element type name A in namespace A' or data type name B in namespace B'.) This is less awful than it sounds. It simplifies the application code in some ways but still allows you to use the schema for validation and authoring. -- Ron
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