“metadata extraction”的概念、定义、翻译、参考文献-科学参考

单词	metadata extraction
释义	metadata extraction Encyclopedia 管理学数字图书馆技术释 metadata extraction元数据抽取针对文档的结构化或半结构化对象描述信息（如HTML文档中的label和body等结构标志信息）进行抽取，生成元数据记录的方法。
随便看	nonnegative definite nonnegative definite kernel nonnegative definite matrix nonnegative definiteness nonnegative definite quadratic estimate non-negative definite quadratic estimator nonnegative divisor nonnegative element nonnegative function nonnegative integer nonnegative integral kernel nonnegative manifold nonnegative matrix non-negative matrix factorization nonnegative measure nonnegative number nonnegative operator nonnegative orthant nonnegative partial sum nonnegative quadratic form nonnegative semi-definite matrix nonnegative solution nonnegative splitting nonnegativity nonnegativity condition

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