{"id":825,"date":"2021-12-18T19:09:05","date_gmt":"2021-12-18T11:09:05","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=825"},"modified":"2021-12-18T19:09:09","modified_gmt":"2021-12-18T11:09:09","slug":"xpath","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=825","title":{"rendered":"xpath"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69e0c4db37aae\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e0c4db37aae\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E4%BB%80%E4%B9%88%E6%98%AFXPath\" >\u4ec0\u4e48\u662fXPath<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E8%B7%AF%E5%BE%84%E8%A1%A8%E8%BE%BE%E5%BC%8F\" >XPath\u8def\u5f84\u8868\u8fbe\u5f0f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E6%A0%87%E5%87%86%E5%87%BD%E6%95%B0\" >XPath\u6807\u51c6\u51fd\u6570<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E5%9C%A8XSLT%E4%B8%AD%E4%BD%BF%E7%94%A8\" >XPath\u5728XSLT\u4e2d\u4f7f\u7528<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E6%98%AFW3C%E6%A0%87%E5%87%86\" >XPath\u662fW3C\u6807\u51c6<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E8%8A%82%E7%82%B9\" >XPath\u8282\u70b9<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E6%9C%AF%E8%AF%AD\" >XPath\u672f\u8bed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E8%8A%82%E7%82%B9%E5%85%B3%E7%B3%BB\" >\u8282\u70b9\u5173\u7cfb<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E8%AF%AD%E6%B3%95\" >XPath\u8bed\u6cd5<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E9%80%89%E5%8F%96%E8%8A%82%E7%82%B9\" >\u9009\u53d6\u8282\u70b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E8%B0%93%E8%AF%AD\" >\u8c13\u8bed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E9%80%89%E5%8F%96%E6%9C%AA%E7%9F%A5%E8%8A%82%E7%82%B9\" >\u9009\u53d6\u672a\u77e5\u8282\u70b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E9%80%89%E5%8F%96%E8%8B%A5%E5%B9%B2%E8%B7%AF%E5%BE%84\" >\u9009\u53d6\u82e5\u5e72\u8def\u5f84<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath_Axes%E8%BD%B4\" >XPath Axes(\u8f74)<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E8%BD%B4\" >XPath\u8f74<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#%E4%BD%8D%E7%BD%AE%E8%B7%AF%E5%BE%84%E8%A1%A8%E8%BE%BE%E5%BC%8F\" >\u4f4d\u7f6e\u8def\u5f84\u8868\u8fbe\u5f0f<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=825\/#XPath%E8%BF%90%E7%AE%97%E7%AC%A6\" >XPath\u8fd0\u7b97\u7b26<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\" id=\"%E4%BB%80%E4%B9%88%E6%98%AFxpath\"><span class=\"ez-toc-section\" id=\"%E4%BB%80%E4%B9%88%E6%98%AFXPath\"><\/span>\u4ec0\u4e48\u662fXPath<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ul class=\"wp-block-list\"><li>XPath\u4f7f\u7528\u8def\u5f84\u8868\u8fbe\u5f0f\u5728XML\u6587\u6863\u4e2d\u8fdb\u884c\u5bfc\u822a<\/li><li>XPath\u5305\u542b\u4e00\u4e2a\u6807\u51c6\u51fd\u6570\u5e93<\/li><li>XPath\u662fXSLT\u4e2d\u7684\u4e3b\u8981\u5143\u7d20<\/li><li>XPath\u662f\u4e00\u4e2aW3C\u6807\u51c6<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xpath%E8%B7%AF%E5%BE%84%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><span class=\"ez-toc-section\" id=\"XPath%E8%B7%AF%E5%BE%84%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><\/span>XPath\u8def\u5f84\u8868\u8fbe\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>XPath\u4f7f\u7528\u8def\u5f84\u8868\u8fbe\u5f0f\u6765\u9009\u53d6XML\u6587\u6863\u4e2d\u7684\u8282\u70b9\u6216\u8005\u8282\u70b9\u96c6\u3002\u8fd9\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\u548c\u6211\u4eec\u5728\u5e38\u89c4\u7684\u7535\u8111\u6587\u4ef6\u7cfb\u7edf\u4e2d\u770b\u5230\u7684\u8868\u8fbe\u5f0f\u975e\u5e38\u76f8\u4f3c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xpath%E6%A0%87%E5%87%86%E5%87%BD%E6%95%B0\"><span class=\"ez-toc-section\" id=\"XPath%E6%A0%87%E5%87%86%E5%87%BD%E6%95%B0\"><\/span>XPath\u6807\u51c6\u51fd\u6570<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>XPath\u542b\u6709\u8d85\u8fc7100\u4e2a\u5185\u5efa\u7684\u51fd\u6570\u3002\u8fd9\u4e9b\u51fd\u6570\u7528\u4e8e\u5b57\u7b26\u4e32\u503c\u3001\u6570\u503c\u3001\u65e5\u671f\u548c\u65f6\u95f4\u6bd4\u8f83\u3001\u8282\u70b9\u548cQName\u5904\u7406\u3001\u5e8f\u5217\u5904\u7406\u3001\u903b\u8f91\u503c\u7b49\u7b49\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xpath%E5%9C%A8xslt%E4%B8%AD%E4%BD%BF%E7%94%A8\"><span class=\"ez-toc-section\" id=\"XPath%E5%9C%A8XSLT%E4%B8%AD%E4%BD%BF%E7%94%A8\"><\/span>XPath\u5728XSLT\u4e2d\u4f7f\u7528<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>XPath\u662fXSLT\u6807\u51c6\u4e2d\u7684\u4e3b\u8981\u5143\u7d20\u3002\u5982\u679c\u6ca1\u6709XPath\u65b9\u9762\u7684\u77e5\u8bc6\uff0c\u60a8\u5c31\u65e0\u6cd5\u521b\u5efaXSLT\u6587\u6863\u3002<br>XQuery\u548cXPointer\u5747\u6784\u5efa\u4e8eXPath\u8868\u8fbe\u5f0f\u4e4b\u4e0a\u3002XQuery 1.0 \u548c XPath 2.0 \u5171\u4eab\u76f8\u540c\u7684\u6570\u636e\u6a21\u578b\uff0c\u5e76\u652f\u6301\u76f8\u540c\u7684\u51fd\u6570\u548c\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xpath%E6%98%AFw3c%E6%A0%87%E5%87%86\"><span class=\"ez-toc-section\" id=\"XPath%E6%98%AFW3C%E6%A0%87%E5%87%86\"><\/span>XPath\u662fW3C\u6807\u51c6<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>XPath\u4e8e1999\u5e7411\u670816\u65e5\u6210\u4e3aW3C\u6807\u51c6\u3002<br>XPath\u88ab\u8bbe\u8ba1\u4e3a\u4f9bXSLT\u3001XPointer\u4ee5\u53ca\u5176\u4ed6XML\u89e3\u6790\u8f6f\u4ef6\u4f7f\u7528\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"xpath%E8%8A%82%E7%82%B9\"><span class=\"ez-toc-section\" id=\"XPath%E8%8A%82%E7%82%B9\"><\/span>XPath\u8282\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>\u5728XPath\u4e2d\uff0c\u6709\u4e03\u79cd\u7c7b\u578b\u7684\u8282\u70b9\uff1a\u5143\u7d20\u3001\u5c5e\u6027\u3001\u6587\u672c\u3001\u547d\u540d\u7a7a\u95f4\u3001\u5904\u7406\u6307\u4ee4\u3001\u6ce8\u91ca\u4ee5\u53ca\u6587\u6863\u8282\u70b9\uff08\u6216\u79f0\u4e3a\u6839\u8282\u70b9\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xpath%E6%9C%AF%E8%AF%AD\"><span class=\"ez-toc-section\" id=\"XPath%E6%9C%AF%E8%AF%AD\"><\/span>XPath\u672f\u8bed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u8282\u70b9(Node)<\/li><li>\u57fa\u672c\u503c(\u6216\u79f0\u539f\u5b50\u503c, Atomic value)<\/li><li>\u9879\u76ee(Item)<br>\u9879\u76ee\u662f\u57fa\u672c\u503c\u6216\u8005\u8282\u70b9<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E8%8A%82%E7%82%B9%E5%85%B3%E7%B3%BB\"><span class=\"ez-toc-section\" id=\"%E8%8A%82%E7%82%B9%E5%85%B3%E7%B3%BB\"><\/span>\u8282\u70b9\u5173\u7cfb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u7236(Parent)<\/li><li>\u5b50(Children)<\/li><li>\u540c\u80de(Sibling)<\/li><li>\u5148\u8f88(Ancestor)<\/li><li>\u540e\u4ee3(Descendant)<\/li><\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"xpath%E8%AF%AD%E6%B3%95\"><span class=\"ez-toc-section\" id=\"XPath%E8%AF%AD%E6%B3%95\"><\/span>XPath\u8bed\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>XPath\u4f7f\u7528\u8def\u5f84\u8868\u8fbe\u5f0f\u6765\u9009\u53d6XML\u6587\u6863\u4e2d\u7684\u8282\u70b9\u6216\u8282\u70b9\u96c6\u3002\u8282\u70b9\u662f\u901a\u8fc7\u6cbf\u7740\u8def\u5f84(path)\u6216\u8005\u6b65(steps)\u6765\u9009\u53d6\u7684\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E9%80%89%E5%8F%96%E8%8A%82%E7%82%B9\"><span class=\"ez-toc-section\" id=\"%E9%80%89%E5%8F%96%E8%8A%82%E7%82%B9\"><\/span>\u9009\u53d6\u8282\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>XPath\u4f7f\u7528\u8def\u5f84\u8868\u8fbe\u5f0f\u5728XML\u6587\u6863\u4e2d\u9009\u53d6\u8282\u70b9\u3002\u8282\u70b9\u662f\u901a\u8fc7\u6cbf\u7740\u8def\u5f84\u6216\u8005step\u6765\u9009\u53d6\u7684\u3002<\/p>\n\n\n\n<p>\u5728\u4e0b\u9762\u7684\u8bb2\u8ff0\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4ee5\u4e0bXML\u6587\u6863\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">&lt;?xml version=\"1.0\" encoding=\"ISO-8859-1\"?&gt;\n\n&lt;bookstore&gt;\n\n&lt;book&gt;\n  &lt;title lang=\"eng\"&gt;Harry Potter&lt;\/title&gt;\n  &lt;price&gt;29.99&lt;\/price&gt;\n&lt;\/book&gt;\n\n&lt;book&gt;\n  &lt;title lang=\"eng\"&gt;Learning XML&lt;\/title&gt;\n  &lt;price&gt;39.95&lt;\/price&gt;\n&lt;\/book&gt;\n\n&lt;\/bookstore&gt;\n<\/code><\/pre>\n\n\n\n<p>\u4e0b\u9762\u5217\u51fa\u4e86\u6700\u6709\u7528\u7684\u8def\u5f84\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8868\u8fbe\u5f0f<\/th><th>\u63cf\u8ff0<\/th><\/tr><\/thead><tbody><tr><td>nodename<\/td><td>\u9009\u53d6\u6b64\u8282\u70b9\u7684\u6240\u6709\u5b50\u8282\u70b9<\/td><\/tr><tr><td>\/<\/td><td>\u4ece\u6839\u8282\u70b9\u9009\u53d6<\/td><\/tr><tr><td>\/\/<\/td><td>\u4ece\u5339\u914d\u9009\u62e9\u7684\u5f53\u524d\u8282\u70b9\u9009\u62e9\u6587\u6863\u4e2d\u7684\u8282\u70b9\uff0c\u800c\u4e0d\u8003\u8651\u5b83\u4eec\u7684\u4f4d\u7f6e<\/td><\/tr><tr><td>.<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9<\/td><\/tr><tr><td>..<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u7236\u8282\u70b9<\/td><\/tr><tr><td>@<\/td><td>\u9009\u53d6\u5c5e\u6027<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u5b9e\u4f8b<\/strong><br>\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5df2\u7ecf\u5217\u51fa\u4e86\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\u4ee5\u53ca\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>bookstore<\/td><td>\u9009\u53d6bookstore\u5143\u7d20\u7684\u6240\u6709\u5b50\u8282\u70b9<\/td><\/tr><tr><td>\/bookstore<\/td><td>\u9009\u53d6\u6839\u5143\u7d20bookstore(\u6ce8\u91ca\uff1a\u5047\u5982\u8def\u5f84\u8d77\u59cb\u4e8e\u6b63\u659c\u6760\/\uff0c\u5219\u6b64\u8def\u5f84\u59cb\u7ec8\u4ee3\u8868\u5230\u67d0\u5143\u7d20\u7684\u7edd\u5bf9\u8def\u5f84!)<\/td><\/tr><tr><td>bookstore\/book<\/td><td>\u9009\u53d6\u5c5e\u4e8ebookstore\u7684\u5b50\u5143\u7d20\u7684\u6240\u6709book\u5143\u7d20<\/td><\/tr><tr><td>\/\/book<\/td><td>\u9009\u53d6\u6240\u6709book\u5b50\u5143\u7d20\uff0c\u800c\u4e0d\u7ba1\u5b83\u4eec\u5728\u6587\u6863\u4e2d\u7684\u4f4d\u7f6e<\/td><\/tr><tr><td>bookstore\/\/book<\/td><td>\u9009\u62e9\u5c5e\u4e8ebookstore\u5143\u7d20\u7684\u540e\u4ee3\u7684\u6240\u6709book\u5143\u7d20\uff0c\u800c\u4e0d\u7ba1\u5b83\u4eec\u4f4d\u4e8ebookstore\u4e4b\u4e0b\u7684\u4ec0\u4e48\u4f4d\u7f6e<\/td><\/tr><tr><td>\/\/@lang<\/td><td>\u9009\u53d6\u540d\u4e3alang\u7684\u6240\u6709\u5c5e\u6027<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E8%B0%93%E8%AF%AD\"><span class=\"ez-toc-section\" id=\"%E8%B0%93%E8%AF%AD\"><\/span>\u8c13\u8bed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8c13\u8bed\u7528\u6765\u67e5\u627e\u67d0\u4e2a\u7279\u5b9a\u7684\u8282\u70b9\u6216\u8005\u5305\u542b\u67d0\u4e2a\u6307\u5b9a\u7684\u503c\u7684\u8282\u70b9\u3002<br>\u8c13\u8bed\u88ab\u5d4c\u5728\u65b9\u62ec\u53f7\u4e2d\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u4f8b<\/strong><br>\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5217\u51fa\u4e86\u5e26\u6709\u8c13\u8bed\u7684\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\uff0c\u4ee5\u53ca\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>\/bookstore\/book[1]<\/td><td>\u9009\u53d6\u5c5e\u4e8ebookstore\u5b50\u5143\u7d20\u7684\u7b2c\u4e00\u4e2abook\u5143\u7d20<\/td><\/tr><tr><td>\/bookstore\/book[last()]<\/td><td>\u9009\u53d6\u5c5e\u4e8ebookstore\u5b50\u5143\u7d20\u7684\u6700\u540e\u4e00\u4e2abook\u5143\u7d20<\/td><\/tr><tr><td>\/bookstore\/book[last()-1]<\/td><td>\u9009\u53d6\u5c5e\u4e8ebookstore\u5b50\u5143\u7d20\u7684\u5012\u6570\u7b2c\u4e8c\u4e2abook\u5143\u7d20<\/td><\/tr><tr><td>\/bookstore\/book[position()&lt;3]<\/td><td>\u9009\u53d6\u6700\u524d\u9762\u7684\u4e24\u4e2a\u5c5e\u4e8ebookstore\u5143\u7d20\u7684\u5b50\u5143\u7d20\u7684book\u5143\u7d20<\/td><\/tr><tr><td>\/\/title[@lang]<\/td><td>\u9009\u53d6\u6240\u6709\u62e5\u6709\u540d\u4e3alang\u7684\u5c5e\u6027\u7684title\u5143\u7d20<\/td><\/tr><tr><td>\/\/title[@lang=&#8217;eng&#8217;]<\/td><td>\u9009\u53d6\u6240\u6709title\u5143\u7d20\uff0c\u4e14\u8fd9\u4e9b\u5143\u7d20\u62e5\u6709\u503c\u4e3aeng\u7684lang\u5c5e\u6027<\/td><\/tr><tr><td>\/bookstore\/book[price&gt;35.00]<\/td><td>\u9009\u53d6bookstore\u5143\u7d20\u7684\u6240\u6709book\u5143\u7d20\uff0c\u4e14\u5176\u4e2d\u7684price\u5143\u7d20\u7684\u503c\u987b\u5927\u4e8e35.00<\/td><\/tr><tr><td>\/bookstore\/book[price&gt;35.00]\/title<\/td><td>\u9009\u53d6bookstore\u5143\u7d20\u4e2d\u7684book\u5143\u7d20\u7684\u6240\u6709title\u5143\u7d20\uff0c\u4e14\u5176\u4e2d\u7684price\u5143\u7d20\u7684\u503c\u987b\u5927\u4e8e35.00<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E9%80%89%E5%8F%96%E6%9C%AA%E7%9F%A5%E8%8A%82%E7%82%B9\"><span class=\"ez-toc-section\" id=\"%E9%80%89%E5%8F%96%E6%9C%AA%E7%9F%A5%E8%8A%82%E7%82%B9\"><\/span>\u9009\u53d6\u672a\u77e5\u8282\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>XPath\u901a\u914d\u7b26\u53ef\u7528\u6765\u9009\u53d6\u672a\u77e5\u7684XML\u5143\u7d20\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u901a\u914d\u7b26<\/th><th>\u63cf\u8ff0<\/th><\/tr><\/thead><tbody><tr><td>*<\/td><td>\u5339\u914d\u4efb\u4f55\u5143\u7d20\u8282\u70b9<\/td><\/tr><tr><td>@*<\/td><td>\u5339\u914d\u4efb\u4f55\u5c5e\u6027\u8282\u70b9<\/td><\/tr><tr><td>node()<\/td><td>\u5339\u914d\u4efb\u4f55\u7c7b\u578b\u7684\u8282\u70b9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u5b9e\u4f8b<\/strong><br>\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5217\u51fa\u4e86\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>\/bookstore\/*<\/td><td>\u9009\u53d6bookstore\u5143\u7d20\u7684\u6240\u6709\u5b50\u5143\u7d20<\/td><\/tr><tr><td>\/\/*<\/td><td>\u9009\u53d6\u6587\u6863\u4e2d\u7684\u6240\u6709\u5143\u7d20<\/td><\/tr><tr><td>\/\/title[@*]<\/td><td>\u9009\u53d6\u6240\u6709\u5e26\u6709\u5c5e\u6027\u7684title\u5143\u7d20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E9%80%89%E5%8F%96%E8%8B%A5%E5%B9%B2%E8%B7%AF%E5%BE%84\"><span class=\"ez-toc-section\" id=\"%E9%80%89%E5%8F%96%E8%8B%A5%E5%B9%B2%E8%B7%AF%E5%BE%84\"><\/span>\u9009\u53d6\u82e5\u5e72\u8def\u5f84<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u901a\u8fc7\u5728\u8def\u5f84\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528&#8221;|&#8221;\u8fd0\u7b97\u7b26\uff0c\u60a8\u53ef\u4ee5\u9009\u53d6\u82e5\u5e72\u4e2a\u8def\u5f84\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u4f8b<\/strong><br>\u5728\u4e0b\u9762\u7684\u8868\u683c\u4e2d\uff0c\u6211\u4eec\u5217\u51fa\u4e86\u4e00\u4e9b\u8def\u5f84\u8868\u8fbe\u5f0f\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8def\u5f84\u8868\u8fbe\u5f0f<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>\/\/book\/title | \/\/book\/price<\/td><td>\u9009\u53d6book\u5143\u7d20\u7684\u6240\u6709title\u548cprice\u5143\u7d20<\/td><\/tr><tr><td>\/\/title | \/\/price<\/td><td>\u9009\u53d6\u6587\u6863\u4e2d\u7684\u6240\u6709title\u548cprice\u5143\u7d20<\/td><\/tr><tr><td>\/bookstore\/book\/title | \/\/price<\/td><td>\u9009\u53d6\u5c5e\u4e8ebookstore\u5143\u7d20\u7684book\u5143\u7d20\u7684\u6240\u6709title\u5143\u7d20\uff0c\u4ee5\u53ca\u6587\u6863\u4e2d\u6240\u6709\u7684price\u5143\u7d20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"xpath-axes%E8%BD%B4\"><span class=\"ez-toc-section\" id=\"XPath_Axes%E8%BD%B4\"><\/span>XPath Axes(\u8f74)<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"xpath%E8%BD%B4\"><span class=\"ez-toc-section\" id=\"XPath%E8%BD%B4\"><\/span>XPath\u8f74<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8f74\u53ef\u5b9a\u4e49\u76f8\u5bf9\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u8282\u70b9\u96c6\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8f74\u540d\u79f0<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>ancestor<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5148\u8f88(\u7236\u3001\u7956\u7236\u7b49)\u3002<\/td><\/tr><tr><td>ancestor-or-self<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5148\u8f88(\u7236\u3001\u7956\u7236\u7b49)\u4ee5\u53ca\u5f53\u524d\u8282\u70b9\u672c\u8eab<\/td><\/tr><tr><td>attribute<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5c5e\u6027<\/td><\/tr><tr><td>child<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5b50\u5143\u7d20<\/td><\/tr><tr><td>descendant<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u540e\u4ee3\u5143\u7d20(\u5b50\u3001\u5b59\u7b49)\u3002<\/td><\/tr><tr><td>descendant-or-self<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u540e\u4ee3\u5143\u7d20(\u5b50\u3001\u5b59\u7b49)\u4ee5\u53ca\u5f53\u524d\u8282\u70b9\u672c\u8eab\u3002<\/td><\/tr><tr><td>following<\/td><td>\u9009\u53d6\u6587\u6863\u4e2d\u5f53\u524d\u8282\u70b9\u7684\u7ed3\u675f\u6807\u7b7e\u4e4b\u540e\u7684\u6240\u6709\u8282\u70b9<\/td><\/tr><tr><td>namespace<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u547d\u540d\u7a7a\u95f4\u8282\u70b9<\/td><\/tr><tr><td>parent<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u7236\u8282\u70b9<\/td><\/tr><tr><td>preceding<\/td><td>\u9009\u53d6\u6587\u6863\u4e2d\u5f53\u524d\u8282\u70b9\u7684\u5f00\u59cb\u6807\u7b7e\u4e4b\u524d\u7684\u6240\u6709\u8282\u70b9\u3002<\/td><\/tr><tr><td>preceding-sibling<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u4e4b\u524d\u7684\u6240\u6709\u540c\u7ea7\u8282\u70b9\u3002<\/td><\/tr><tr><td>self<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E4%BD%8D%E7%BD%AE%E8%B7%AF%E5%BE%84%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><span class=\"ez-toc-section\" id=\"%E4%BD%8D%E7%BD%AE%E8%B7%AF%E5%BE%84%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><\/span>\u4f4d\u7f6e\u8def\u5f84\u8868\u8fbe\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4f4d\u7f6e\u8def\u5f84\u53ef\u4ee5\u4f7f\u7edd\u5bf9\u7684\uff0c\u4e5f\u53ef\u4ee5\u662f\u76f8\u5bf9\u7684\u3002<br>\u7edd\u5bf9\u8def\u5f84\u8d77\u59cb\u4e8e\u6b63\u659c\u6760(\/)\uff0c\u800c\u76f8\u5bf9\u8def\u5f84\u4e0d\u4f1a\u8fd9\u6837\u3002\u5728\u4e24\u79cd\u60c5\u51b5\u4e2d\uff0c\u4f4d\u7f6e\u8def\u5f84\u5747\u5305\u62ec\u4e00\u4e2a\u6216\u591a\u4e2a\u6b65\uff0c\u6bcf\u4e2a\u6b65\u5747\u88ab\u659c\u6760\u5206\u5272\uff1a<\/p>\n\n\n\n<p><strong>\u7edd\u5bf9\u4f4d\u7f6e\u8def\u5f84<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">\/step\/step\/...\n<\/code><\/pre>\n\n\n\n<p><strong>\u76f8\u5bf9\u4f4d\u7f6e\u8def\u5f84<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">step\/step\/step\/...\n<\/code><\/pre>\n\n\n\n<p>\u6bcf\u4e2a\u6b65\u5747\u6839\u636e\u5f53\u524d\u8282\u70b9\u96c6\u4e4b\u4e2d\u7684\u8282\u70b9\u6765\u8fdb\u884c\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p>\u6b65(step)\u5305\u62ec\uff1a<\/p>\n\n\n\n<p><strong>\u8f74(axis)<\/strong><br>\u5b9a\u4e49\u6240\u9009\u8282\u70b9\u4e0e\u5f53\u524d\u8282\u70b9\u4e4b\u95f4\u7684\u6811\u5173\u7cfb<\/p>\n\n\n\n<p><strong>\u8282\u70b9\u6d4b\u8bd5(node-test)<\/strong><br>\u8bc6\u522b\u67d0\u4e2a\u8f74\u5185\u90e8\u7684\u8282\u70b9<\/p>\n\n\n\n<p><strong>\u96f6\u4e2a\u6216\u8005\u66f4\u591a\u8c13\u8bed(predicate)<\/strong><br>\u66f4\u6df1\u5165\u5730\u63d0\u70bc\u6240\u9009\u7684\u8282\u70b9\u96c6<\/p>\n\n\n\n<p><strong>\u6b65\u7684\u8bed\u6cd5:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">\u8f74\u540d\u79f0::\u8282\u70b9\u6d4b\u8bd5[\u8c13\u8bed]\n<\/code><\/pre>\n\n\n\n<p><strong>\u5b9e\u4f8b<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u4f8b\u5b50<\/th><th>\u7ed3\u679c<\/th><\/tr><\/thead><tbody><tr><td>child::book<\/td><td>\u9009\u53d6\u6240\u6709\u5c5e\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u5b50\u5143\u7d20\u7684book\u8282\u70b9\u3002<\/td><\/tr><tr><td>attribute::lang<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684lang\u5c5e\u6027<\/td><\/tr><tr><td>child::*<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5b50\u5143\u7d20<\/td><\/tr><tr><td>attribute::*<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5c5e\u6027<\/td><\/tr><tr><td>child::text()<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u6587\u672c\u5b50\u8282\u70b9<\/td><\/tr><tr><td>child::node()<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709\u5b50\u8282\u70b9<\/td><\/tr><tr><td>descendant::book<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709book\u540e\u4ee3<\/td><\/tr><tr><td>ancestor::book<\/td><td>\u9009\u62e9\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709book\u540e\u8f88<\/td><\/tr><tr><td>ancestor-or-self::book<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709book\u5148\u8f88\u4ee5\u53ca\u5f53\u524d\u8282\u70b9(\u5982\u679c\u6b64\u8282\u70b9\u662fbook\u8282\u70b9)<\/td><\/tr><tr><td>child::*\/child::price<\/td><td>\u9009\u53d6\u5f53\u524d\u8282\u70b9\u7684\u6240\u6709price\u5b59\u8282\u70b9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"xpath%E8%BF%90%E7%AE%97%E7%AC%A6\"><span class=\"ez-toc-section\" id=\"XPath%E8%BF%90%E7%AE%97%E7%AC%A6\"><\/span>XPath\u8fd0\u7b97\u7b26<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>XPath\u8868\u8fbe\u5f0f\u53ef\u8fd4\u56de\u8282\u70b9\u96c6\u3001\u5b57\u7b26\u4e32\u3001\u903b\u8f91\u503c\u4ee5\u53ca\u6570\u5b57\u3002<\/p>\n\n\n\n<p>\u53ef\u7528\u5728XPath\u8868\u8fbe\u5f0f\u4e2d\u7684\u8fd0\u7b97\u7b26\uff1a<\/p>\n\n\n\n<p>| + &#8211; * div = != &lt; &lt;= &gt; &gt;= or and mod<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662fXPath XPath\u4f7f\u7528\u8def\u5f84\u8868\u8fbe\u5f0f\u5728XML\u6587\u6863\u4e2d\u8fdb\u884c\u5bfc\u822a XPath\u5305\u542b\u4e00\u4e2a\u6807\u51c6\u51fd\u6570\u5e93 XPath\u662fXSLT\u4e2d\u7684\u4e3b\u8981\u5143\u7d20 XPath\u662f\u4e00\u4e2aW3C\u6807\u51c6 XPath\u8def\u5f84\u8868\u8fbe\u5f0f XPath\u4f7f\u7528\u8def\u5f84\u8868&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[90,89],"class_list":["post-825","post","type-post","status-publish","format-standard","hentry","category-10","tag-web","tag-xpath"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=825"}],"version-history":[{"count":1,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/825\/revisions"}],"predecessor-version":[{"id":826,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/825\/revisions\/826"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}