Ios Restkit XML映射对象返回null

使用Restkit并使用XML作为现在的响应，与我的自定义类buy Content_Doc内部的标记值returing null进行映射。映射有什么问题吗？请帮助

XML

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任何人都可以回顾一下

我不怎么使用XML，但看起来这种关系应该是：

... relationshipMappingFromKeyPath:@"Content_Docs" ...

RKObjectMapping* contentMapping = [RKObjectMapping mappingForClass:[Content class]];
    [contentMapping addAttributeMappingsFromDictionary:
            @{@"id.text" : @“conID”,@“name.text" : @"name"}];

RKObjectMapping* Content_DocsMapping = [RKObjectMapping mappingForClass:[Content_Docs class]];
    [authorMapping addAttributeMappingsFromDictionary:
            @{@"id.text" : @"subDocId",@"name.text" : @"name"}];

  [contentMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"Content_Docs.Content_Doc" toKeyPath:@"Content_Doc" withMapping:authorMapping]];

... relationshipMappingFromKeyPath:@"Content_Docs" ...