HTML转义码以及W3C HTML4和HTML5验证程序之间的差异

接受此代码：

<a href='http://www.sparql.org/sparql?query=+PREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E%0D%0A+SELECT+%3FAgent%0D%0A+FROM+%3Chttp%3A%2F%2Fwww.w3.org%2F2012%2FpyRdfa%2Fextract%3Furi%3Dhttp%3A%2F%2Fontomatica.com%2Fpublic%2Ftest%2F2_infotext.html%3E%0D%0A+WHERE%0D%0A+{%0D%0A+%3Fs+foaf%3AAgent+%3FAgent+.%0D%0A+}%0D%0A&amp;default-graph-uri=&amp;output=text&amp;stylesheet=%2Fxml-to-html.xsl' title='Click here to query the page using SPARQL'><img src='http://www.example.com/public/bin/logo_sparql.png' alt='Run SPARQL query'/></a>

---

在

SPARQL'>位置，如果将
{
和
}
转义为
%7B
和
%7D
，则它可以工作

<a href='http://www.sparql.org/sparql?query=+PREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E%0D%0A+SELECT+%3FAgent%0D%0A+FROM+%3Chttp%3A%2F%2Fwww.w3.org%2F2012%2FpyRdfa%2Fextract%3Furi%3Dhttp%3A%2F%2Fontomatica.com%2Fpublic%2Ftest%2F2_infotext.html%3E%0D%0A+WHERE%0D%0A+%7B%0D%0A+%3Fs+foaf%3AAgent+%3FAgent+.%0D%0A+%7B%0D%0A&amp;default-graph-uri=&amp;output=text&amp;stylesheet=%2Fxml-to-html.xsl' title='Click here to query the page using SPARQL'><img src='http://www.example.com/public/bin/logo_sparql.png' alt='Run SPARQL query'/></a>

您的花括号
{
可能需要编码为
%7B
。更正Undo Brad！（向低俗小说爱好者道歉）。请回答，这样我才能接受答案。
<a href='http://www.sparql.org/sparql?query=+PREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E%0D%0A+SELECT+%3FAgent%0D%0A+FROM+%3Chttp%3A%2F%2Fwww.w3.org%2F2012%2FpyRdfa%2Fextract%3Furi%3Dhttp%3A%2F%2Fontomatica.com%2Fpublic%2Ftest%2F2_infotext.html%3E%0D%0A+WHERE%0D%0A+%7B%0D%0A+%3Fs+foaf%3AAgent+%3FAgent+.%0D%0A+%7B%0D%0A&amp;default-graph-uri=&amp;output=text&amp;stylesheet=%2Fxml-to-html.xsl' title='Click here to query the page using SPARQL'><img src='http://www.example.com/public/bin/logo_sparql.png' alt='Run SPARQL query'/></a>