Comments and PIs are not allowed in XMPP -> throw an exception.

src/Makefile

@@ -20,7 +20,8 @@ SRCS = XMPPAuthenticator.m	\
        XMPPRosterItem.m		\
        XMPPSCRAMAuth.m		\
        XMPPSRVLookup.m		\
-       XMPPStanza.m
+       XMPPStanza.m		\
+       XMPPXMLElementBuilder.m
 
 INCLUDES = ${SRCS:.m=.h}	\
 	   namespaces.h		\

src/XMPPConnection.m

@@ -533,7 +533,7 @@
 	parser = [[OFXMLParser alloc] init];
 	[parser setDelegate: self];
 
-	elementBuilder = [[OFXMLElementBuilder alloc] init];
+	elementBuilder = [[XMPPXMLElementBuilder alloc] init];
 	[elementBuilder setDelegate: self];
 
 	[sock writeFormat: @"<?xml version='1.0'?>\n"

src/XMPPXMLElementBuilder.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2012, Jonathan Schleifer <js@webkeks.org>
+ *
+ * https://webkeks.org/hg/objxmpp/
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <ObjFW/OFXMLElementBuilder.h>
+
+@interface XMPPXMLElementBuilder: OFXMLElementBuilder
+@end

src/XMPPXMLElementBuilder.m

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2012, Jonathan Schleifer <js@webkeks.org>
+ *
+ * https://webkeks.org/hg/objxmpp/
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#import "XMPPXMLElementBuilder.h"
+
+#import <ObjFW/OFMalformedXMLException.h>
+
+@implementation XMPPXMLElementBuilder
+-		 (void)parser: (OFXMLParser*)parser
+  foundProcessingInstructions: (OFString*)pi
+{
+	@throw [OFMalformedXMLException exceptionWithClass: isa];
+}
+
+- (void)parser: (OFXMLParser*)parser
+  foundComment: (OFString*)comment
+{
+	@throw [OFMalformedXMLException exceptionWithClass: isa];
+}
+@end