ErrInvalidAttribute is returned when the Attribute struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidDocument is returned when the Document struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidNamespace is returned when the Namespace struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidNode is returned when the Node struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidParser is returned when the Parser struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidSchema is returned when the Schema struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidXPathContext is returned when the XPathContext struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidXPathExpression is returned when the XPathExpression struct (probably the pointer to the underlying C struct is not valid).

ErrInvalidXPathObject is returned when the XPathObject struct (probably the pointer to the underlying C struct is not valid).

PtrSource is the single interface that connects the rest of libxml2 package with this pacakge.

C14NMode represents the C14N mode supported by libxml2.

XMLNodeType identifies the type of the underlying C struct.