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Thank you for the answers that
confirmed my understanding. I didn't mean to omit XSD (it's actually the one I know more), but with reference to technical documentation, the main two current applications use DTDs (DITA, DocBook to 4.5) and NG/Schematron (DocBook 5.0). I guess for authoring purposes, in most cases industry standard schemas will suffice. Especially with DITA specialization feature. Probably, not in too many instances that a business will choose to develop their own schema (generically speaking, incl. DTD). From a schema development perspective within this scope, it seems to me that it is more of concern to broad info architectures and tool developers, and may be content management. But one motive I see for developing own in narratives or paginated documents, is that customization and/or parameterization of standard ones isn't very straight forward. Developing own schema that is more requirement specific simplifies the development of scratch transformations to assume better control over publishing appearance -- unless investment in high-end tools. This is really the niche where I was interested in finding more about how likely/often a practitioner would need develop custom schema. Any further comments appreciated. Regards. Khaled |