多少节点匹配选择器？
清单11的graph子句和提供给查询的命名图中的每个人员节点匹配。
Listing 11's graph clause matches on each person node in the named FOAF graphs given to the query.
指纹图像的特征提取是指纹识别的关键，而指纹匹配通常基于细节点匹配。
Minutiae extraction is essential in fingerprint recognition, and fingerprint match is used to search minutiae.
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