如何使用“约：” XSLT处理器中的HTML5协议 [英] How to use the "about:" protocol of HTML5 in XSLT processors
问题描述
HTML5草案指定（目前至少），关于：legacy-compat 的URI 可用于依赖符合XML的doctype的文档（<！DOCTYPE html> 不是。）
The HTML5 draft specifies (at the moment at least), that the URI about:legacy-compat can be used for documents, that rely on an XML conforming doctype (which <!DOCTYPE html> isn't).
所以我碰巧有一堆HTML5验证XML文件，开头是：
So I happen to have a bundle of HTML5-validating XML files, that start with:
<!DOCTYPE html SYSTEM "about:legacy-compat">
不幸的是，当我将这样的XHTML5文档与Xalan或Saxon等XSLT处理器一起使用时，他们自然会尝试解决（不可解析的）URI。
Unfortunately, when I use such an XHTML5 document with any XSLT processor like Xalan or Saxon, they naturally try to resolve the (unresolvable) URI.
有没有办法让他们忽略URI或者在引擎盖下进行虚假解析？试图解决它的问题发生在这些文档的早期，所以例如Saxon的 -dtd：off 开关在这里没有效果。
Is there any way to bring them into ignoring the URI or faux-resolving it under the hood? The try to resolve it happens early in these documents, so for example Saxon's -dtd:off switch has no effect here.
编辑：低级方法 sed -n'2，$ p'< htmlfile> | otherapp 遗憾的是只有在我开始使用 document（） XPath函数加载另一个XHTML5文件之后才能工作。
The low-level approach sed -n '2,$p' <htmlfile> | otherapp unfortunately only works until I start to use the document() XPath function to load another XHTML5 file.
编辑2：我玩过 XML目录让他们与Saxon和Xalan合作。但是，我总是得到一个
Edit 2: I played around with XML catalogs and got them to work with both Saxon and Xalan. However, then I get always a
java.net.MalformedURLException: unknown protocol: about
嗯，这并不奇怪，但我怎么能绕过这个呢？永远不应该解析URL，只是扔掉。
Well, it's not surprising, but how can I circumvent this? The URL should never be parsed, just thrown away.
推荐答案
将这个Java文件放入$ somepath / foo / about /
Put this Java file into $somepath/foo/about/
package foo.about;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringBufferInputStream;
import java.net.URL;
import java.net.URLConnection;
public class Handler extends java.net.URLStreamHandler {
@Override
protected URLConnection openConnection(URL url) throws IOException {
URLConnection res = new URLConnection(url) {
@Override
public void connect() throws IOException {
connected = true;
}
@Override
public InputStream getInputStream() throws IOException {
return new StringBufferInputStream("<!ELEMENT html ANY>");
}
};
return res;
}
}
现在进入$ somepath并编译它：
Now go in $somepath and compile it:
javac foo/about/Handler.java
调用Saxon时，将以下参数添加到JVM：
Add the following arguments to the JVM when calling Saxon:
-Djava.protocol.handler.pkgs=foo -cp"$somepath"
这是一个修改过的shell脚本脚本（适用于* nix）系统，但它与Windows非常相似）：
Here is a modified shell script script (for *nix system but it it very similar for Windows):
#!/bin/sh
exec java -Djava.protocol.handler.pkgs=foo -classpath /usr/share/java/saxonb.jar:"$somepath" net.sf.saxon.Transform "$@"
如果它不起作用，您可能需要使用本地saxonb-xslt脚本进行调整。
You may want to adapt using your local saxonb-xslt script if it doesn't work.
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