In short, the data architect should be an objective third party, somewhat independent of the application team who...
is empowered with oversight and design of the data in the application. Just as an application architect is expected to be well-versed in software architecture, programming languages, programming methodologies, so must the data architect specialize in the field of data and meta data. There is usually too much involved to have one person be responsible for delivering a robust, scalable, reusable, high quality data architecture AND deliver a robust, high performance, high-quality application at the same time.
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