在 RDFLib 中解析 HTML+RDFa

Question

RDFLib 似乎support 解析 RDFa 数据。在实现一个片段来解析 RDFa 注释的 HTML 页面后，我运行遇到了这个问题：

Traceback (most recent call last):
  File "/home/zonk/.local/lib/python3.8/site-packages/rdflib/plugin.py", line 107, in get
    p = _plugins[(name, kind)]
KeyError: ('html', <class 'rdflib.parser.Parser'>)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "basic-rdfa.py", line 7, in <module>
    g.parse("beatles.rdfa.html", format='html') 
  File "/home/zonk/.local/lib/python3.8/site-packages/rdflib/graph.py", line 1209, in parse
    parser = plugin.get(format, Parser)()
  File "/home/zonk/.local/lib/python3.8/site-packages/rdflib/plugin.py", line 109, in get
    raise PluginException("No plugin registered for (%s, %s)" % (name, kind))
rdflib.plugin.PluginException: No plugin registered for (html, <class 'rdflib.parser.Parser'>)

使用了以下代码段：

from rdflib import Graph, plugin
g = Graph()
g.parse("beatles.rdfa.html", format='html') 

for subj, pred, obj in g:
    if(subj, pred, obj) not in g:
        raise Exception("Zonk!")

print(f"Graph g has {len(g)} statements.")
print(g.serialize(format="turtle"))

具有以下虚拟数据：

<!DOCTYPE html>

<html lang="en">
<head>
  <title>John Lennon</title>
</head>

<div vocab="http://schema.org/">
  <div typeof="Person">
    <link property="rdfa:copy" href="#lennon"/>
    <link property="rdfa:copy" href="#band"/>
  </div>
  <p resource="#lennon" typeof="rdfa:Pattern"> 
    Name: <span property="name">John Lennon</span>
  <p>
  <div resource="#band" typeof="rdfa:Pattern">
    <div property="band" typeof="MusicGroup">
      <link property="rdfa:copy" href="#beatles"/>
    </div>
  </div>
  <div resource="#beatles" typeof="rdfa:Pattern">
    <p>Band: <span property="name">The Beatles</span></p>
    <p>Size: <span property="size">4</span> players</p>
  </div>
</div>
</html>

确实 plugin.py 中没有一行记录任何 HTML 数据。在这种情况下，我如何解析 rdfa 注释数据？

提前谢谢你。

Answer 1

抱歉，文档已过时，我们在当前 RDFlib 版本 (6.0.0) 或先前版本 (5.0.0) 中不再支持 RDFa 解析

要获得 RDFa 支持，您必须使用 RDFlib 4.2.2 (https://github.com/RDFLib/rdflib/tree/4.2.2)。

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