Общие вопросы

Attribute values require quotation marks.
Values for attributes must be in single or double quotation marks. For example, without XML validation, you can specify language=JScript in a <script> element. But to follow XML rules, the same attribute would be language="JScript".

Reserved characters in script elements must be made opaque.
Script elements frequently include greater than (<) and less than (>) symbols, the ampersand symbol (&), and other characters that are reserved in XML. If you are creating a closely conformant XML file, you must make sure that these reserved characters do not confuse the XML parser. You can individually mark characters with escape sequences (for example, specify "<" as "&lt;"), or you can make an entire script element opaque by enclosing it in a <![CDATA[ ...]]> section. Without XML validation, the script component XML parser treats <script> elements as opaque by default.