Error: The processing instruction target matching “[xX][mM][lL]” is not allowed

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Xerces-based tools will emit the following error

The processing instruction target matching "[xX][mM][lL]" is not allowed.

when an XML declaration is encountered anywhere other than at the top of an XML file.

This is a valid diagnostic message; other XML parsers should issue a similar error message in this situation.

To correct the problem, check the following possibilities:

  1. Some blank space or other visible content exists before the <?xml ?>
    declaration.

    Resolution: remove blank space or any other
    visible content before the XML declaration.

  2. Some invisible content exists before the <?xml ?>
    declaration.     Most commonly this is a Byte Order Mark
    (BOM)    .

    Resolution:
    Remove the BOM using techniques such as those suggested by the W3C
    page on the BOM in HTML.

  3. A stray <?xml ?> declaration exists within the XML content.
    This can happen when XML files are combined programmatically or
    via cut-and-paste. There can only be one <?xml ?> declaration
    in an XML file, and it can only be at the top.

    Resolution: Search for
    <?xml in a case-insensitive manner, and remove all but the top XML
    declaration from the file.

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