Rather than sequentially searching through the text data using string matching, as done with the XQuery contains function, Net search Extender USES a text index.
Net Search Extender并不使用字符串匹配连续地搜索文本数据(就像XQuery contains函数所做的那样),而是使用文本索引。
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If no custom document model is supplied as index parameter, Net Search Extender USES its default document model.