GDataXML nodesForXPath的节点包含整个GDataXMLDocument的项目(G

我想创建一个iOS应用其中（除其他一些东西）需要一个WordPress页的内容加载

当我使用getPosts从WordPress的的XML-RPC的功能特点，我碰到下面的返回：

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
  <params>
    <param>
      <value>
      <array><data>
  <value><struct>
  <member><name>post_id</name><value><string>23</string></value></member>
  <member><name>post_title</name><value><string>&lt;!--:de--&gt;Post1&lt;!--:--&gt;&lt;!--:en--&gt;Post1&lt;!--:--&gt;</string></value></member>
  <member><name>post_date</name><value><dateTime.iso8601>20140211T14:26:39</dateTime.iso8601></value></member>
  <member><name>post_date_gmt</name><value><dateTime.iso8601>20140211T12:26:39</dateTime.iso8601></value></member>
  <member><name>post_modified</name><value><dateTime.iso8601>20140217T22:32:45</dateTime.iso8601></value></member>
  <member><name>post_modified_gmt</name><value><dateTime.iso8601>20140217T20:32:45</dateTime.iso8601></value></member>
  <member><name>post_status</name><value><string>publish</string></value></member>
  <member><name>post_type</name><value><string>post</string></value></member>
  <member><name>post_name</name><value><string>im-notfall</string></value></member>
  <member><name>post_author</name><value><string>1</string></value></member>
  <member><name>post_password</name><value><string></string></value></member>
  <member><name>post_excerpt</name><value><string></string></value></member>
  <member><name>post_content</name><value><string>&lt;!--:de--&gt;&lt;b&gt;Post1&lt;/b&gt;&lt;!--:--&gt;&lt;!--:en--&gt;&lt;b&gt;Post1&lt;/b&gt;&lt;!--:--&gt;</string></value></member>
  <member><name>post_parent</name><value><string>0</string></value></member>
  <member><name>post_mime_type</name><value><string></string></value></member>
  <member><name>link</name><value><string>http://example.com/ExampleProjekt/?p=23</string></value></member>
  <member><name>guid</name><value><string>http://example.com/ExampleProjekt/?p=23</string></value></member>
  <member><name>menu_order</name><value><int>5</int></value></member>
  <member><name>comment_status</name><value><string>closed</string></value></member>
  <member><name>ping_status</name><value><string>open</string></value></member>
  <member><name>sticky</name><value><boolean>0</boolean></value></member>
  <member><name>post_thumbnail</name><value><array><data>
</data></array></value></member>
  <member><name>post_format</name><value><string>standard</string></value></member>
  <member><name>terms</name><value><array><data>
  <value><struct>
  <member><name>term_id</name><value><string>1</string></value></member>
  <member><name>name</name><value><string>Allgemein</string></value></member>
  <member><name>slug</name><value><string>allgemein</string></value></member>
  <member><name>term_group</name><value><string>0</string></value></member>
  <member><name>term_taxonomy_id</name><value><string>1</string></value></member>
  <member><name>taxonomy</name><value><string>category</string></value></member>
  <member><name>description</name><value><string></string></value></member>
  <member><name>parent</name><value><string>0</string></value></member>
  <member><name>count</name><value><int>3</int></value></member>
</struct></value>
</data></array></value></member>
  <member><name>custom_fields</name><value><array><data>
</data></array></value></member>
</struct></value>
  <value><struct>
  <member><name>post_id</name><value><string>9</string></value></member>
  <member><name>post_title</name><value><string>&lt;!--:de--&gt;Post2&lt;!--:--&gt;&lt;!--:en--&gt;Post2&lt;!--:--&gt;</string></value></member>
  <member><name>post_date</name><value><dateTime.iso8601>20140206T13:16:56</dateTime.iso8601></value></member>
  <member><name>post_date_gmt</name><value><dateTime.iso8601>20140206T11:16:56</dateTime.iso8601></value></member>
  <member><name>post_modified</name><value><dateTime.iso8601>20140217T22:33:01</dateTime.iso8601></value></member>
  <member><name>post_modified_gmt</name><value><dateTime.iso8601>20140217T20:33:01</dateTime.iso8601></value></member>
  <member><name>post_status</name><value><string>publish</string></value></member>
  <member><name>post_type</name><value><string>post</string></value></member>
  <member><name>post_name</name><value><string>neuer-erster-beitrag</string></value></member>
  <member><name>post_author</name><value><string>1</string></value></member>
  <member><name>post_password</name><value><string></string></value></member>
  <member><name>post_excerpt</name><value><string></string></value></member>
  <member><name>post_content</name><value><string>&lt;!--:de--&gt;&lt;b&gt;Post2&lt;/b&gt;&lt;!--:--&gt;&lt;!--:en--&gt;&lt;b&gt;Post2&lt;/b&gt;&lt;!--:--&gt;</string></value></member>
  <member><name>post_parent</name><value><string>0</string></value></member>
  <member><name>post_mime_type</name><value><string></string></value></member>
  <member><name>link</name><value><string>http://example.com/ExampleProjekt/?p=9</string></value></member>
  <member><name>guid</name><value><string>http://example.com/ExampleProjekt/?p=9</string></value></member>
  <member><name>menu_order</name><value><int>3</int></value></member>
  <member><name>comment_status</name><value><string>closed</string></value></member>
  <member><name>ping_status</name><value><string>open</string></value></member>
  <member><name>sticky</name><value><boolean>0</boolean></value></member>
  <member><name>post_thumbnail</name><value><array><data>
</data></array></value></member>
  <member><name>post_format</name><value><string>standard</string></value></member>
  <member><name>terms</name><value><array><data>
  <value><struct>
  <member><name>term_id</name><value><string>1</string></value></member>
  <member><name>name</name><value><string>Allgemein</string></value></member>
  <member><name>slug</name><value><string>allgemein</string></value></member>
  <member><name>term_group</name><value><string>0</string></value></member>
  <member><name>term_taxonomy_id</name><value><string>1</string></value></member>
  <member><name>taxonomy</name><value><string>category</string></value></member>
  <member><name>description</name><value><string></string></value></member>
  <member><name>parent</name><value><string>0</string></value></member>
  <member><name>count</name><value><int>3</int></value></member>
</struct></value>
</data></array></value></member>
  <member><name>custom_fields</name><value><array><data>
</data></array></value></member>
</struct></value>
  <value><struct>
  <member><name>post_id</name><value><string>5</string></value></member>
  <member><name>post_title</name><value><string>&lt;!--:de--&gt;Post3&lt;!--:--&gt;&lt;!--:en--&gt;Post3&lt;!--:--&gt;</string></value></member>
  <member><name>post_date</name><value><dateTime.iso8601>20131217T17:32:09</dateTime.iso8601></value></member>
  <member><name>post_date_gmt</name><value><dateTime.iso8601>20131217T15:32:09</dateTime.iso8601></value></member>
  <member><name>post_modified</name><value><dateTime.iso8601>20140217T22:33:18</dateTime.iso8601></value></member>
  <member><name>post_modified_gmt</name><value><dateTime.iso8601>20140217T20:33:18</dateTime.iso8601></value></member>
  <member><name>post_status</name><value><string>publish</string></value></member>
  <member><name>post_type</name><value><string>post</string></value></member>
  <member><name>post_name</name><value><string>test-beitrag-2</string></value></member>
  <member><name>post_author</name><value><string>1</string></value></member>
  <member><name>post_password</name><value><string></string></value></member>
  <member><name>post_excerpt</name><value><string></string></value></member>
  <member><name>post_content</name><value><string>&lt;!--:de--&gt;&lt;b&gt;Post3&lt;/b&gt;&lt;!--:--&gt;&lt;!--:en--&gt;&lt;b&gt;Post3&lt;/b&gt;&lt;!--:--&gt;</string></value></member>
  <member><name>post_parent</name><value><string>0</string></value></member>
  <member><name>post_mime_type</name><value><string></string></value></member>
  <member><name>link</name><value><string>http://example.com/ExampleProjekt/?p=5</string></value></member>
  <member><name>guid</name><value><string>http://example.com/ExampleProjekt/?p=5</string></value></member>
  <member><name>menu_order</name><value><int>4</int></value></member>
  <member><name>comment_status</name><value><string>closed</string></value></member>
  <member><name>ping_status</name><value><string>open</string></value></member>
  <member><name>sticky</name><value><boolean>0</boolean></value></member>
  <member><name>post_thumbnail</name><value><array><data>
</data></array></value></member>
  <member><name>post_format</name><value><string>standard</string></value></member>
  <member><name>terms</name><value><array><data>
  <value><struct>
  <member><name>term_id</name><value><string>1</string></value></member>
  <member><name>name</name><value><string>Allgemein</string></value></member>
  <member><name>slug</name><value><string>allgemein</string></value></member>
  <member><name>term_group</name><value><string>0</string></value></member>
  <member><name>term_taxonomy_id</name><value><string>1</string></value></member>
  <member><name>taxonomy</name><value><string>category</string></value></member>
  <member><name>description</name><value><string></string></value></member>
  <member><name>parent</name><value><string>0</string></value></member>
  <member><name>count</name><value><int>3</int></value></member>
</struct></value>
</data></array></value></member>
  <member><name>custom_fields</name><value><array><data>
</data></array></value></member>
</struct></value>
</data></array>
      </value>
    </param>
  </params>
</methodResponse>

现在我想通过以下两种的foreach语句，让每一个岗位几个字段我需要（内容，标题，ID等）：

GDataXMLDocument *XMLdoc = [[GDataXMLDocument alloc] initWithData:XMLcontent options:0 error:nil];
NSArray *XMLofPosts = [XMLdoc  nodesForXPath:@"//methodResponse/params/param/value/array/data/value" error:nil];

for(GDataXMLNode *post in XMLofPosts){
    NSArray *postMembers = [post nodesForXPath:@"//value/struct/member" error:nil];
    for(GDataXMLElement *postMember in postMembers){
        NSString *key = [[[postMember elementsForName:@"name"] objectAtIndex:0] stringValue];
        NSString *value = [[[postMember elementsForName:@"value"] objectAtIndex:0] stringValue];
        // ...
    }
}

不过我现在面临的问题，即postMembers包含XML文档所有成员，而不仅仅是一个“后”。我是不是做错了什么或有什么办法来解决这个问题？

对于任何XPath查询开始/ ，你告诉XPath引擎忽略当前上下文，并在根开始代替。使用//value ，要查询所有<value/>从根元素 ，无论你通过什么上下文项。

使用以下XPath查询应该返回你正在寻找的元素：

寻找上下文。我删除了不必要的第二/在开始的时候（这将在您的查询的评估减缓），并添加/struct轴步（我想你刚才忘了？）。
```
 /methodResponse/params/param/value/array/data 
```
返回所有<member/> S为当前上下文：
```
 value/struct/member 
```
或者你也可以明确地表示使用当前上下文. （这是我比较喜欢的，因为它明确地说，我想要的东西XPath表达式做）使用
```
 ./value/struct/member 
```