Escape characters for HTML and XML languages

Xml HTML the escape character in

HTML, >,& and so on have special meaning, (the first two characters used for link check,& for escape), cannot be used directly. When you use these three characters, you should use their escape sequences, as follows:

& or &

&

And

< or <

<

Less than sign

> or >

>

Greater-than sign

"

"

Double quotes

Space

©

©

Copyright symbol

®

®

Register character

The former is a character escape sequence, and the latter is a numeric escape sequence. The number is converted to the ASCII value of the character. For example & lt; Font > shown as, if directly written as is considered a link to sign.

What needs to be stated is:

A. there should be no spaces between the characters of the escape sequence;

B. the escape sequence must end with ";" ;

c. a separate & is not considered to be an escape start;

d. Case sensitive.

Another character that needs to be escaped is the quotation mark, whose escape sequence is "" "or" "

The character set used by HTML is the ISO &859 Larin-1 character set, which has many characters that cannot be entered on a standard keyboard. Only escape sequences can be used for these special characters.

XML Escape Character

An illegal XML character must be replaced with the corresponding entity.

If you use a character similar to "<" in an XML document, the parser will get an error because the parser will think that this is the beginning of a new element. So you should not write the code as follows:

If salary < 1000 Then

To avoid this, you must convert the character "<" to an entity, as follows:

If salary < 1000 Then

Here are five entities that are predefined in an XML document:

<

<

Less than sign

>

>

Greater-than sign

&

&

And

'

'

Single quotation mark

"

"

Double quotes

The entity must begin with the symbol "&" with the symbol ";" End.

Note: Only the "<" and "&" characters are strictly prohibited for XML. The rest is legal, and in order to reduce errors, using entities is a good habit.