Analysis When Microsoft rolled out an open source extension stack for PostgreSQL to handle document-style data, it wasn't just taking aim at MongoDB – the dominant NoSQL player – but also blurring the lines between relational and non-relational databases, according to one expert. Despite the tech giant having built a multitrillion-dollar valuation largely on proprietary software, its latest bid to back open source systems and compete in the document database market promises a schema-light approa...