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XMLCDATA

All text in an XML document is parsed by the parser.

Only text within a CDATA section is ignored by the parser.

PCDATA - Parsed Character Data

XML parsers typically parse all text in an XML document.

When an XML element is parsed, the text between its tags is also parsed: This text is also parsed</message>

Parsers do this because XML elements can contain other elements, as in this example where the <name> element contains two other elements (first and last):

The parser breaks it down into sub-elements like this:

Parsed Character Data (PCDATA) is the term used for text data parsed by XML parsers.

CDATA - (Unparsed) Character Data

The term CDATA refers to text data that should not be parsed by the XML parser.

Characters like "<" and "&" are illegal in XML elements.

"<" causes an error because the parser interprets it as the start of a new element.

"&" causes an error because the parser interprets it as the start of a character entity.

Certain text, such as JavaScript code, contains many "<" or "&" characters. To avoid errors, script code can be defined as CDATA.

All content within a CDATA section is ignored by the parser.

A CDATA section starts with "" and ends with "]]>":

In the above example, the parser ignores all content within the CDATA section.

Notes on CDATA Sections:

CDATA sections cannot contain the string "]]>". Nested CDATA sections are not allowed.

The "]]>" marking the end of a CDATA section cannot contain spaces or line breaks.

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