xml:space 

Allows one to signal to an application whether an element's white space is
"significant". The behavior of xml:space cascades to all descendant elements, but it can
be turned off locally by setting the xml:space attribute to the value
"default".

Attribute Information

Used By

Attribute Group xml:space2

Source 

<xs:attribute name="space" use="optional" form="qualified">
  <xs:annotation>
    <xs:documentation>Allows one to signal to an application whether an element's white space is "significant". The behavior of xml:space cascades to all descendant elements, but it can be turned off locally by setting the xml:space attribute to the value "default".</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:token">
      <xs:enumeration value="default">
        <xs:annotation>
          <xs:documentation>Allows the application to handle white space as necessary. Not including an xml:space attribute produces the same result as using the default value.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="preserve">
        <xs:annotation>
          <xs:documentation>Instructs the application to maintain white space "as-is", suggesting that it might have meaning.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>

Sample