Question

对于示例XML：

<aaa name ="a1">
  <bbb name="b1"/>
  <bbb name="b2"/>
  <ccc name="c1">
    <bbb name="b3"/>
  </ccc>
  <ddd name="d1">
    <bbb name="b4"/>
  </ddd>
</aaa>

我想选择所有父节点不是bbb节点的ccc个节点。这将是名称为b1，b2和b4的节点。

我已经尝试过XPath /aaa//bbb[not(parent::ccc)]，但这仍然会选择https://codebeautify.org/Xpath-Tester处的所有bbb节点。

Answer 1

CodeBeautify.org是错误的，并且您的XPath是正确的。

您的XPath应该选择

library("ggplot2")
set.seed(111018)
interval1 <- -qnorm((1-0.9)/2)  

means_treatment_1 <- rnorm(2)
se_treatment_1 <- rnorm(2)

df_treatment_1 <- data.frame("Mean" = means_treatment_1,
                         "lower" = means_treatment_1 - se_treatment_1*interval1,
                         "upper" = means_treatment_1 + se_treatment_1*interval1,
                         "Variable" = c("medicare_spending_dummy", 
                                        "job_training_dummy"),
                         "Treatment" = "a")


means_treatment_2 <- rnorm(2)
se_treatment_2 <- rnorm(2)

df_treatment_2 <- data.frame("Mean" = means_treatment_2,
                         "lower" = means_treatment_2 - se_treatment_2*interval1,
                         "upper" = means_treatment_2 + se_treatment_2*interval1,
                         "Variable" = c("medicare_spending_dummy", 
                                        "job_training_dummy"),
                         "Treatment" = "b")



df_tot<-rbind(df_treatment_1, df_treatment_2)



# Plot


ggplot(df_tot, aes(colour = Treatment)) +
geom_hline(yintercept = 0, colour = gray(1/2), lty = 2) +
geom_pointrange(aes(x = Variable, y = Mean, ymin = lower, ymax = upper ),lwd = 1, position = position_dodge(width = 1/2)) +

coord_flip() + 
theme_bw()

满足您的期望，即未选择<bbb name="b1"/> <bbb name="b2"/> <bbb name="b4"/>。

鉴于这种基本问题，我会避免使用CodeBeautify。

以下是两个返回正确结果的备用XPath在线站点：

XPath 1.0： http://www.xpathtester.com/xpath
XPath 2.0 +： http://videlibri.sourceforge.net/cgi-bin/xidelcgi

Answer 2

这通过使用xpath解决了

/aaa//bbb[local-name(..) != 'ccc']

在codebeautify.org上进行XPath测试有什么问题？

2 个答案: