startPrefixMapping Method
Begins the scope of the prefix-URI namespace mapping. This method is always invoked before the corresponding startElement method.
Visual Basic Implementation Syntax
Sub startPrefixMapping(strPrefix As String, strURI As String)
Parameters
strPrefix
The namespace prefix being declared.
strURI
The namespace URI to which the prefix is mapped.
Return Values
If failed, the ContentHandler raises a trappable error.
C/C++ Syntax
HRESULT startPrefixMapping(
[in] const wchar_t * pwchPrefix,
[in] int cchPrefix,
[in] const wchar_t * pwchUri
[in] int cchUri);
Parameters
pwchPrefix[in]
The prefix being mapped.
cchPrefix[in]
The length of the prefix string, or –1 (if zero-terminated).
pwchUri[in]
The namespace URI to which the prefix is mapped.
cchUri[in]
The length of the namespace URI string.
Return Values
S_OK
The value returned if no errors occur.
E_FAIL
The value returned if the parse operation should be aborted.
Remarks
The information from this event is not necessary for normal namespace processing. The reader automatically replaces prefixes for element and attribute names when the "http://xml.org/sax/features/namespaces" feature is set to True (the default).
There are cases, however, when applications need to use prefixes in character data or in attribute values and they cannot safely be expanded automatically. In these cases, the startPrefixMapping and endPrefixMapping methods can supply the information needed to expand prefixes.
There is no guarantee that the startPrefixMapping and endPrefixMapping events are properly nested relative to each other. All startPrefixMapping events occur before the corresponding startElement event, and all endPrefixMapping events occur after the corresponding endElement event, but their order is not otherwise guaranteed.
Versioning
Implemented in: MSXML 3.0 and later
Applies to
See Also
endElement Method
endPrefixMapping Method
startElement Method