SGML is one of the standards that has most influenced the web, and both XML and HTML owe much of their design to SGML. SGML successfully brought important issues regarding document authoring, storage and exchange formats to the attention of the information technology communities. Especially, SGML emphasized:
Based on the communication between Pei Wei and Marc Andreessen quoted earlier, one could conclude that PWP evolved from RRP. However, this does not seem to be the case. The proposals differ greatly. In particular, the syntax, the selector mechanism, value propagation, and then names of properties/values of each are fundamentally different.
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Like ISO's OSI model, ODA has been highly influential without having seen much use itself. ODA, along with the other systems described in this chapter, championed the idea of separating the logical representation of content from its physical presentation. However, ODA went several steps further than the other systems. Unlike SGML and XML, ODA also describes the presentation of documents. Compared with LaTex, Scribe and HTML, ODA goes further by, for example, also standardizing image formats.
Almost all assignments, no matter how complicated, can be reduced to a single question. Your first step, then, is to distill the assignment into a specific question. For example, if your assignment is, “Write a report to the local school board explaining the potential benefits of using computers in a fourth-grade class,” turn the request into a question like, “What are the potential benefits of using computers in a fourth-grade class?” After you’ve chosen the question your essay will answer, compose one or two complete sentences answering that question.This fragment not only announces your subject, but it focuses on one segment of the population: elementary school children. Furthermore, it raises a subject upon which reasonable people could disagree, because while most people might agree that children consume more sugar than they used to, not everyone would agree on what should be done or who should do it. You should note that this fragment is not a thesis statement because your reader doesn’t know your conclusions on the topic.