如何在JAVA中获取XPath查询结果的父节点

Question

I use javax.xml.parsers.DocumentBuilder in the java. Given markup like this:

 <?xml version="1.0" encoding="utf-8"?>
    <calendar>
        <endfiscalyear month="12" dayofmonth="28" />
        <year yr="2014">
          <event month="12" dayofmonth="24">
            <p>Dividendenauszahlung</p>
            <en>dividend payment</en>
          </event>
        </year>
        <year yr="2015">
          <event month="2" dayofmonth="1">
            <p>Hauptversammlung</p>
            <en>general meeting</en>
          </event>
           <event month="5" dayofmonth="2">
            <p>Hauptversammlung</p>
            <en>general meeting</en>
          </event>
          <event month="8" dayofmonth="21">
            <p>Ergebnis 2.Quartal</p>
            <en>1st quarter results</en>
          </event>
        </year>
      </calendar>

Now I am interested in getting the last year and month and dayofmonth only, where the last is 'general meeting', in this mask it should be year@yr=2015, <event month="4" dayofmonth="21"> . I can get the year, month and day separately, but as i tried, none of them get shown. first l'd like any year: the two ways that i tried are:

//*@yr[event/en='general meeting']   

or

/calendar/year[event/en='general meeting']@yr 

but none of them are correct. How would you like to solve the problem?

Answer 1

It is unclear what you are asking, but sometimes it is easier to comment on an attempted solution than trying to explain.

The following XPath expression is valid:

/calendar/year[event/en='general meeting']/@yr

and here is what it does:

Select year elements, but only if they have a child element event , which in turn has a child element en , whose textual content is "general meeting". Of those year elements select the attribute yr .

For the input document you show, only one such attribute would qualify, and therefore the output would be

 yr="2015"

Is this what you had in mind? If not, please show (instead of trying to explain) the output you expect from an expression - and explain why this result should be selected.