Transcription: Public identifiers are really a legacy from previous SGML usage where there were a series of pieces of document type definitions that were being reused over and over again in very large contracts and even government contracts. So that's where the ISO came into play, created the public identifier capability so that these standard DDTs and DDT subsets could be reused by multiple vendors and multiple companies. But really you're going to be using a lot of these system identifiers because that is really the most common and it's very simple. You give it an entity name, you say it's a system identif ...
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