If the XML parsing process terminates with error message NAT8311, the XML input document is syntactically invalid. The reason codes returned, along with NAT8311, represent the following meanings:

Reason Codes for Error Message NAT8311

Reason Code	Explanation
101	Out of memory
102	Syntax error
103	No element found
104	Not well-formed (invalid token)
105	Unclosed token
106	Partial character
107	Mismatched tag
108	Duplicate attribute
109	Junk after document element
110	Illegal parameter entity reference
111	Undefined entity
112	Recursive entity reference
113	Asynchronous entity
114	Reference to invalid character number
115	Reference to binary entity
116	Reference to external entity in attribute
117	XML or text declaration not at start of entity
118	Unknown encoding
119	Encoding specified in XML declaration is incorrect
120	Unclosed CDATA section
121	Error in processing external entity reference
122	Document is not standalone
123	Unexpected parser state – please send a bug report
124	Entity declared in parameter entity
125	Requested feature requires XML_DTD support in Expat
126	Cannot change setting once parsing has begun
127	Unbound prefix
128	Must not undeclare prefix
129	Incomplete markup in parameter entity
130	XML declaration not well-formed
131	Text declaration not well-formed
132	Illegal character(s) in public ID
133	Parser suspended
134	Parser not suspended
135	Parsing aborted
136	Parsing finished
137	Cannot suspend in external parameter entity
138	Reserved prefix (xml) must not be undeclared or bound to another namespace name
139	Reserved prefix (xmlns) must not be declared or undeclared
140	Prefix must not be bound to one of the reserved namespace names
141	Invalid argument
142	A successful prior call to function XML_GetBuffer is required
143	Limit on input amplification factor (from DTD and entities) breached