本文介绍了EclipseLink MOXy @XmlPath支持axis / parent的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
以下任何XPath表达式是否可以接受？使用eclipselink的2.3.1版本
Are any of the following XPath expressions acceptable? Using version 2.3.1 of eclipselink
@XmlPath("../header/@type")
@XmlPath("/root/header/@type")
@XmlPath("parent::*/header/@type")
基本上这是在XML文档中重复的类（ / root / tag ），如果不清楚我会详细说明。
Basically this is in a class which repeats within the XML document (/root/tag), if that isn't clear I'll elaborate.
我正试图遍历树而不是向下。我的其他 @XmlPath 注释工作正常。
I'm trying to traverse up the tree rather than down. My other @XmlPath annotations are working fine.
推荐答案
目前不支持axis / parent。如果您对此类支持感兴趣，请输入增强请求：
EclipseLink JAXB (MOXy) does currently not support axes/parent. If you are interested in this kind of support please enter an enhancement request:
- https://bugs.eclipse.org/bugs/enter_bug.cgi?product=EclipseLink
它确实支持XPath：
It does support XPath like:
- @XmlPath（。）/ /映射到自身节点，在将两个对象映射到同一元素时很有用
- @XmlPath（@ foo）//映射到属性
- @ XmlPath（foo）//映射到元素
- @XmlPath（foo [2]）//映射到第二次出现
- @XmlPath（foo [@ bar ='Hello World']）//使用值为Hello World的bar属性映射到foo元素
- @XmlPath（ns1：foo / ns2：@bar）//映射到命名空间限定节点
- @XmlPath(".") // Map to self node, useful when mapping two objects to same element
- @XmlPath("@foo") // Map to attribute
- @XmlPath("foo") // Map to element
- @XmlPath("foo[2]") // Map to 2nd occurence of
- @XmlPath("foo[@bar='Hello World']") // Map to foo element with bar attribute with value "Hello World"
- @XmlPath("ns1:foo/ns2:@bar") // Map to namespace qualified nodes
更多信息
- http://blog.bdoughan.com/2010/07/xpath-based-mapping.html
- http://blog.bdoughan.com/2010/09/xpath-based-mapping-geocode-example.html
- http://blog.bdoughan.com/2011/03/map-to-element-based-on-attribute-value.html
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