公开(公告)号：US20070250471A1

公开(公告)日：2007-10-25

申请号：US11380136

申请日：2006-04-25

申请人： MARCUS FONTOURA ,  VANJA JOSIFOVSKI ,  ZIV BAR-YOSSEF

发明人： MARCUS FONTOURA ,  VANJA JOSIFOVSKI ,  ZIV BAR-YOSSEF

IPC分类号： G06F17/30

CPC分类号： G06F16/83

摘要： A method that eagerly evaluates predicates of XPath queries over XML document nodes for a set of commonly known functions and operators (including arithmetic, general comparison, value comparison, Boolean operators, etc.) without materializing sequences is discussed. Such eager evaluation of predicates reduces the amount of buffer space required since evaluation sequences have to be buffered only partially during the predicate evaluation process. Document nodes to be selected by a query are determined earlier so that they can be outputted without buffering.

摘要翻译： 讨论了一种通过XML文档节点对一组常见已知功能和运算符（包括算术，一般比较，值比较，布尔运算符等）的XPath查询的谓词进行评估的方法，而不实现序列。 这种对谓词的这种热切的评估减少了所需的缓冲空间的量，因为评估序列必须在谓词评估过程中仅部分缓冲。 更早地确定由查询选择的文档节点，使得它们可以不缓冲地输出。