This file is indexed.

/usr/lib/cgi-bin/schemaExtension.xsd is in qgis-server 2.8.6+dfsg-1build1.

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<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:wms="http://www.opengis.net/wms" xmlns:qgs="http://www.qgis.org/wms" targetNamespace="http://www.qgis.org/wms" elementFormDefault="qualified" version="1.0.0">
  <import namespace="http://www.opengis.net/wms" schemaLocation="http://schemas.opengis.net/wms/1.3.0/capabilities_1_3_0.xsd"/>
  <element name="GetPrint" type="wms:OperationType" substitutionGroup="wms:_ExtendedOperation" />
  <element name="GetStyles" type="wms:OperationType" substitutionGroup="wms:_ExtendedOperation" />
</schema>