sch:include 

The required href attribute references an external well-formed XML document
whose document element is a Schematron element of a type which allowed by the grammar for
Schematron at the current position in the schema. The external document is inserted in place
of the include element.

Element Information

Model

Attributes

QName Type Fixed Default Use Inheritable Annotation
href sch:uriValue required 
References an external well-formed XML document.

Used By

Elements sch:diagnostics, sch:pattern, sch:phase, sch:rule, sch:schema

Source 

<xs:element name="include">
  <xs:annotation>
    <xs:documentation>The required href attribute references an external well-formed XML document whose document element is a Schematron element of a type which allowed by the grammar for Schematron at the current position in the schema. The external document is inserted in place of the include element.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:attribute name="href" use="required" type="sch:uriValue">
      <xs:annotation>
        <xs:documentation>References an external well-formed XML document.</xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
</xs:element>

Sample