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Table of Contents
Escape Special Characters
Handle Control Characters
Use CDATA for Large Blocks
Home Backend Development XML/RSS Tutorial How to escape a string for use in XML?

How to escape a string for use in XML?

Nov 22, 2025 am 05:15 AM

Answer: Special characters such as &, , ", ' need to be escaped as corresponding entities, control characters can be removed, and large sections of text can be wrapped with CDATA. For example, "He said "Hello "" should be converted to He said "Hello "; use when containing a large number of special characters; programming languages ​​often provide functions such as escape to assist processing.

How to escape a string for use in XML?

When including text in XML, certain characters need to be escaped to ensure the document remains well-formed. Invalid characters can break parsing or lead to unexpected behavior.

Escape Special Characters

Replace reserved XML characters with their corresponding entities:

  • & becomes &
  • becomes
  • > becomes >
  • " becomes "
  • ' becomes '

This prevents misinterpretation of content as markup. For example, a string like He said "Hello " should become He said "Hello " .

Handle Control Characters

XML 1.0 does not allow control characters below #32 (except for tab, newline, and carriage return). If your string contains such characters, they must be removed or replaced before inclusion.

If you're processing user input or data from external sources, sanitize it by filtering out invalid Unicode points like \x00 through \x08 , \x0B , \x0C , and \x0E through \x1F .

Use CDATA for Large Blocks

If you have a large string with many special characters (like script code or HTML), wrap it in a CDATA section to avoid escaping each character:

alert("Hello & goodbye"); ]]]>

Inside CDATA sections, only is forbidden because it closes the block.

Basically, escape key symbols, clean unsafe control codes, and consider CDATA when practical. Most programming languages ​​also offer built-in functions—like Python's xml.sax.saxutils.escape() or Java's StringEscapeUtils —to handle this safely.

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