将xml转换为元组和列表

我很兴奋能开始我的erlang之旅，但我已经在这上面呆了几天了，我开始担心我不能在最后期限前完成任务

我试图用xml创建键、值对元组。我想从任何嵌套的xml中列出一个列表。这似乎是一件很平常的事情，但我找不到任何例子

例如：

    <something>
        <Item>
            <name>The Name!</name>
            <reviews>
                    <review>
                        <review-by>WE</review-by>
                        <review-points>92</review-points>
                    </review>

                    <review>
                        <review-by>WS</review-by>
                        <review-points>90</review-points>
                    </review>
            </reviews>
        </Item>
    </something>

其中，每个项目都是主包装器节点

我承认我已经修改了下面的代码。它只返回第一项元素的列表。我不知道如何开始嵌套的

非常感谢

    -module(reader).
    -compile(export_all).
    -include_lib("xmerl/include/xmerl.hrl").

    parse(FileName) ->
        {Records,_} = xmerl_scan:file(FileName),
        extract(Records, []).

    extract(Record, Acc) when is_record(Record, xmlElement) ->
        case Record#xmlElement.name of
            'Item' ->
                ItemData = lists:foldl(fun extract/2, [], Record#xmlElement.content),
                [ {item, ItemData} | Acc ];
            _ ->
                lists:foldl(fun extract/2, Acc, Record#xmlElement.content)
        end;

    extract({xmlText, [{Attribute, _}, {'Item', 2}, _], _, _, Value, text}, Acc) ->
        [{Attribute, Value}|Acc];

    extract(_, Acc) ->
        Acc.

试试看。函数“erlsom:simple_form（XML）”将为您提供{Node，Attrib，Value}：

  {"something",[],
 [{"Item",[],
   [{"name",[],["The Name!"]},
    {"reviews",[],
     [{"review",[],
       [{"review-by",[],["WE"]},{"review-points",[],["92"]}]},
      {"review",[],
       [{"review-by",[],["WS"]},{"review-points",[],["90"]}]}]}]}]}

但是，如果您想删除属性，那么可以编写一个有趣的代码传递给erlsom SAX解析器，或者重新格式化simple_表单的输出。类似这样的内容（用于重新格式化输出）：

这将产生以下输出：

 {"something",
 [{"Item",
   [{"name","The Name!"},
    {"reviews",
     [{"review",[{"review-by","WE"},{"review-points","92"}]},
      {"review",[{"review-by","WS"},{"review-points","90"}]}]}]}]}

注意，我还没有在非常大的XML文件上测试这一点。你应该做一些测试并考虑MEM问题。

-module(reader).
-compile(export_all).

convert(XML)->
    case erlsom:simple_form(XML) of
        {ok,{Node,_Attrib,Value},_}->
            {Node,xml_to_kv(Value)};
        Err->
            Err
    end.


xml_to_kv([{Node,_Attrib,Value}|T])->
    [{Node,lists:flatten(xml_to_kv(Value))}|xml_to_kv(T)];

xml_to_kv(Value)->
    Value.

 {"something",
 [{"Item",
   [{"name","The Name!"},
    {"reviews",
     [{"review",[{"review-by","WE"},{"review-points","92"}]},
      {"review",[{"review-by","WS"},{"review-points","90"}]}]}]}]}