Why Am I Getting the 'The Processing Instruction Target Matching 'xX[lL]' Is Not Allowed' Error in My XSLT Stylesheet?

Error: "The Processing Instruction Target Matching "xX[lL]" Is Not Allowed"

The error message, "The processing instruction target matching 'xX[lL]' is not allowed," indicates an issue with the XML declaration in an XSLT stylesheet. The XML declaration must appear at the very beginning of the file, with no preceding whitespace or other characters.

Correcting the Problem

To resolve this error, check the following possibilities:

• Ensure there is no whitespace or other visible content before the declaration. Remove any leading spaces, newlines, or tabs.
• Check for invisible content, such as a Byte Order Mark (BOM), before the declaration. BOMs are used to specify the byte order of a file and can cause problems if they appear before the XML declaration. Remove the BOM using techniques suggested by the W3C.
• Verify that there is only one declaration in the file, located at the top. Search for "

Example

In the XSLT stylesheet provided, the error likely occurs because of leading spaces before the first line. Remove these spaces to correct the issue:

  
  
    
    
    
      
    
The above is the detailed content of Why Am I Getting the 'The Processing Instruction Target Matching 'xX[lL]' Is Not Allowed' Error in My XSLT Stylesheet?. For more information, please follow other related articles on the PHP Chinese website!