15.2.19. XSD string data type

String data type (String Data Type) ¶

String data types can contain characters, line feeds, carriage returns, and tabs.

Here is an example of a string declaration in a scheme:

<xs:element name="customer" type="xs:string"/>

The elements in the document should look like this:

<customer>John Smith</customer>

Or something like this:

<customer>       John Smith     </customer>

注意： If you use a string data type, the XML processor does not change the value in it.

Normalize string data types (NormalizedString Data Type) ¶

Normalized string data types are derived from string data types.

Normalized string data types can also contain characters, but the XML processor removes line breaks, carriage returns, and tabs.

Here is an example of normalizing string data types in a schema:

<xs:element name="customer" type="xs:normalizedString"/>

The elements in the document should look like this:

<customer>John Smith</customer>

Or something like this:

<customer>     John Smith     </customer>

注意： In the above example, the XML processor replaces all tabs with spaces.

Token data type (Token Data Type) ¶

The Token data type is also derived from the string data type.

The Token data type can also contain characters, but the XML processor removes newline characters, carriage returns, tabs, beginning and ending spaces, and (consecutive) spaces.

Here is an example of an token declaration in schema:

<xs:element name="customer" type="xs:token"/>

The elements in the document should look like this:

<customer>John Smith</customer>

Or something like this:

<customer>     John Smith     </customer>

注意： In the above example, the XML parser removes tabs.

String data type ¶

Note that all of the following data types are derived from the string data type (except the string data type itself)!

Qualification of string data types (Restriction) ¶

Restrictions that can be used with string data types:

• Enumeration

• Length

• MaxLength

• MinLength

• Pattern (this constraint cannot be used by NMTOKENS, IDREFS, and ENTITIES)

• WhiteSpace