bundles/org.apache.jasper.glassfish/src/org/apache/jasper/xmlparser/XMLEncodingDetector.java
private void scanXMLDecl() throws IOException, JasperException {

	if (skipString("<?xml")) {
	    fMarkupDepth++;
	    // NOTE: special case where document starts with a PI
	    //       whose name starts with "xml" (e.g. "xmlfoo")
	    if (XMLChar.isName(peekChar())) {
		fStringBuffer.clear();
		fStringBuffer.append("xml");
		while (XMLChar.isName(peekChar())) {
		    fStringBuffer.append((char)scanChar());
		}
		String target = fSymbolTable.addSymbol(fStringBuffer.ch,
						       fStringBuffer.offset,
						       fStringBuffer.length);
		scanPIData(target, fString);
	    }

	    // standard XML declaration
	    else {
		scanXMLDeclOrTextDecl(false);
	    }
	}
    }
private void scanXMLDecl() throws IOException, JasperException {

	if (skipString("<?xml")) {
	    fMarkupDepth++;
	    // NOTE: special case where document starts with a PI
	    //       whose name starts with "xml" (e.g. "xmlfoo")
	    if (XMLChar.isName(peekChar())) {
		fStringBuffer.clear();
		fStringBuffer.append("xml");
		while (XMLChar.isName(peekChar())) {
		    fStringBuffer.append((char)scanChar());
		}
		String target = fSymbolTable.addSymbol(fStringBuffer.ch,
						       fStringBuffer.offset,
						       fStringBuffer.length);
		scanPIData(target, fString);
	    }

	    // standard XML declaration
	    else {
		scanXMLDeclOrTextDecl(false);
	    }
	}
    }
org.apache.xerces.impl.XMLDocumentScannerImpl.dispatch