[java] Error: The processing instruction target matching "[xX][mM][lL]" is not allowed

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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