Culture Simple Type 

Defines the value used to specify a language for an .sdm file.

<xs:simpleType name="Culture">
    <xs:restriction
        base="string"
    >
        <xs:pattern
                        value="[a-z]{2((-[A-Z]{2)?|(-[A-Z]{3)?)"
                  />
    </xs:restriction>
</xs:simpleType>

Patterns

The following pattern is defined by the Culture simple type:

[a-z]{2((-[A-Z]{2)?|(-[A-Z]{3)?)

A string that is two or three lowercase letters defining a language, and then two, three, or four uppercase and lowercase letters defining a region. For example, en (for English), en-US (for English US), and zh-CHS (for Chinese simplified).