Vega processors included a custom read barrier instruction that included bit field checking in reference metadata as well as special virtual memory protection for GC-compacted pages.
In this article, I shall introduce the field and the significant developments in knowledge management for learning and instruction, focusing on metadata for learning objects.
在本文中，我将介绍这个领域以及学习与教育知识管理的重大进展，重点放在学习对象的元数据上。
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Bruner's "discovery learning" exploited a new field for research-oriented instruction, and Suchman's model for the analysis of inquiry laid an operational basis for this instruction.