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XHTML element with attribute "id" throws an error

See original GitHub issue

Hi, it sounds that since an element in the XHTML template has an “id” attribute, the PDF generation fails:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>Test</title>
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
    </head>
    <body>
        <div id="wrapper">
            <p>Hello world</p>
        </div>
    </body>
</html>

Console log:

InputStream: Doctype given is "-//W3C//DTD XHTML 1.0 Transitional//EN"
InputStream: Document content looks like XHTML 1.0 Strict
no warnings or errors were found
ERREUR :  'NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.'
[error] application - Creating document from template
org.xhtmlrenderer.util.XRRuntimeException: Can't load the XML resource (using TRaX transformer). org.w3c.dom.DOMException: NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.
    at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:191) ~[core-renderer-R8.jar:na]
    at org.xhtmlrenderer.resource.XMLResource.load(XMLResource.java:79) ~[core-renderer-R8.jar:na]
    at util.pdf.PDF.toStream(PDF.java:186) [pdf_2.10-0.5.jar:0.5]
    at util.pdf.PDF.toBytes(PDF.java:168) [pdf_2.10-0.5.jar:0.5]
    at util.pdf.PDF.toBytes(PDF.java:145) [pdf_2.10-0.5.jar:0.5]
    at util.pdf.PDF.toBytes(PDF.java:140) [pdf_2.10-0.5.jar:0.5]
Caused by: javax.xml.transform.TransformerException: org.w3c.dom.DOMException: NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:732) ~[na:1.6.0_35]
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:336) ~[na:1.6.0_35]
    at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:189) ~[core-renderer-R8.jar:na]
    at org.xhtmlrenderer.resource.XMLResource.load(XMLResource.java:79) ~[core-renderer-R8.jar:na]
    at util.pdf.PDF.toStream(PDF.java:186) [pdf_2.10-0.5.jar:0.5]
    at util.pdf.PDF.toBytes(PDF.java:168) [pdf_2.10-0.5.jar:0.5]
Caused by: org.w3c.dom.DOMException: NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.
    at org.apache.xerces.dom.ElementImpl.setIdAttributeNS(Unknown Source) ~[xercesImpl-2.8.1.jar:na]
    at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.startElement(SAX2DOM.java:201) ~[na:1.6.0_35]
    at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.closeStartTag(ToXMLSAXHandler.java:204) ~[na:1.6.0_35]
    at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.characters(ToXMLSAXHandler.java:524) ~[na:1.6.0_35]
    at org.apache.xerces.parsers.AbstractSAXParser.characters(Unknown Source) ~[xercesImpl-2.8.1.jar:na]
    at org.apache.xerces.impl.dtd.XMLDTDValidator.characters(Unknown Source) ~[xercesImpl-2.8.1.jar:na]

Since I remove the “id” attribute, it works out finely. The XHTML template above is valid given http://validator.w3.org/check