This quota limits the length of strings that are created and returned by various APIs. When calling Read() and checking the Value property, the reader chunks string values into manageable pieces (when in streaming mode). However, calling ReadContentAsString() concatenates all these pieces and return one large string. In the binary format, if the value of an element node is a sequence of dictionary string IDs then the values of those strings are concatenated. This can be an extremely large expansion and is mitigated by this limit.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)