# Index of exceptions

A
At [Pxp_core_types.S] | The string is a description where the exn happened.
C
Character_not_supported [Pxp_core_types.S] |
E
Error [Pxp_core_types.S] | Other error
Error_event [Pxp_document] | The event stream contains an `E_error` event
I
ID_not_unique [Pxp_yacc] | Same as `Pxp_tree_parser.ID_not_unique`
ID_not_unique [Pxp_tree_parser] | Used inside `Pxp_tree_parser.index` to indicate that the same ID is attached to several nodes
M
Method_not_applicable [Pxp_core_types.S] | Indicates that a method has been called that is not applicable for the class.
N
Namespace_error [Pxp_core_types.S] | Violation of a namespace constraint
Namespace_method_not_applicable [Pxp_core_types.S] | Indicates that the called method is a namespace method but that the object does not support namespaces.
Namespace_not_in_scope [Pxp_core_types.S] | The namespace scope does not know the URI
Namespace_not_managed [Pxp_core_types.S] | A namespace URI is used but not declared in the namespace manager.
Namespace_prefix_not_managed [Pxp_core_types.S] | A namespace prefix is used but not declared in the namespace manager.
Not_competent [Pxp_reader] | Raised by the `open_in` method if the object does not know how to handle the passed external ID.
Not_competent [Pxp_core_types.S] | The resolver cannot open this kind of entity ID
Not_resolvable [Pxp_reader] | Indicates that the resolver was competent, but there was an error while resolving the external ID.
Not_resolvable [Pxp_core_types.S] | While opening the entity, the nested exception occurred
S
Skip [Pxp_document] | This exception can be used in the functions passed to `map_tree`, `map_tree_sibl`, `iter_tree`, and `iter_tree_sibl` to skip the current node, and to proceed with the next node.
U
Undeclared [Pxp_core_types.S] | Indicates that no declaration is available and because of this every kind of usage is allowed.
V
Validation_error [Pxp_core_types.S] | Violation of a validity constraint
W
WF_error [Pxp_core_types.S] | Violation of a well-formedness constraint