Marklogic REST API-从文档中提取数据
[英]Marklogic REST API - Extract data from documents
问题描述
I am new to MarkLogic, and I'm trying to extract information from documents using the search API. 
我是MarkLogic的新手，我正尝试使用搜索API从文档中提取信息。 My documents are in the below format. 我的文件采用以下格式。
<nitf>
<head>
<title>ABC</title>
</head>
...
...
</nitf>
I would like to show only the titles of the documents that match the search query in the results, ie the search API must return only titles of matching documents. 我只想在结果中显示与搜索查询匹配的文档的标题，即搜索API必须仅返回匹配文档的标题。 I have gone through the documentation and tried a different things such as query options which was suggested by @ehennum , but to no effect. 我浏览了文档并尝试了其他操作，例如@ehennum建议的查询选项，但没有效果。 Any help on this would be great. 任何帮助都会很棒。 Thanks! 谢谢！
3 个解决方案
解决方案1
4 已采纳 2014-03-25 11:02:58
Krishna, it sounds like you don't want snippets at all, so you should turn off snippeting : 克里希纳，听起来您根本不想要摘录，因此您应该关闭摘录 ：
<search:transform-results apply="empty-snippet"/>
Then to get the title, use extract-metadata : 然后要获取标题，请使用extract-metadata ：
<search:extract-metadata>
<search:qname elem-ns="" elem-name="title"/>
</search:extract-metadata>
解决方案2
2 2014-03-25 11:13:52
As a footnote to Dave's good suggestion, MarkLogic 7 provides Query By Example as a simple interface to search. 作为Dave好的建议的脚注，MarkLogic 7提供了“示例查询”作为简单的搜索界面。 Please see: 请参见：
http://docs.marklogic.com/REST/POST/v1/qbe http://docs.marklogic.com/REST/POST/v1/qbe
http://docs.marklogic.com/guide/search-dev/qbe#id_54044 http://docs.marklogic.com/guide/search-dev/qbe#id_54044
The particular query would look something like the following: 特定查询如下所示：
<q:qbe xmlns:q="http://marklogic.com/appservices/querybyexample">
<q:query>
... your query by example ...
</q:query>
<q:response>
<q:snippet><q:none/></q:snippet>
<q:extract><title/></q:extract>
</q:response>
</q:qbe>
If I recall correctly, NITF doesn't use a namespace, but if it did, you'd have to qualify title with the prefix. 如果我没记错的话，NITF不会使用名称空间，但是如果使用了名称空间，则必须使用标题限定标题。
解决方案3
0 2015-05-16 17:35:05
To expand on the fine answer from @dave-cassel, since MarkLogic version 8, the <search:extract-metadata> option is deprecated and you should use search:extract-document-data instead--lifted directly from the API docs: 为了扩展@ dave-cassel的精确答案，从MarkLogic版本8开始，不建议使用<search:extract-metadata>选项，而应使用search:extract-document-data －直接从API文档中删除：
<search:extract-document-data selected="include">
<search:extract-path xmlns="">/userName</search:extract-path>
</search:extract-document-data>
More: https://docs.marklogic.com/search:search#opt-extract-document-data 更多： https ： //docs.marklogic.com/search ： search＃opt-extract-document-data
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