XML in a Nutshell, 3rd Edition

Name

xs:appinfo

Synopsis

<xs:appinfo
  source = "anyURI">
  <!-- any well-formed XML markup -->
</xs:appinfo>

The xs:appinfo element appears exclusively inside xs:annotation elements, where it provides machine-readable information about the schema or schema element it’s documenting. It has no effect on schema validation. It can contain absolutely any XML markup: an XSLT stylesheet for the schema, a schema for the schema, a schema in a different schema language such as Schematron, or anything else you can imagine. The only restriction is that the contents must be well-formed. Alternately, instead of or in addition to including this information directly, the source attribute can point to it using a URI.