Add xml definition of net drive usage report.

windows/netreport/src/netdrive_usage.xsd

+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
+  <xs:element name="report">
+    <xs:complexType>
+      <xs:sequence>
+        <xs:element ref="item"  minOccurs="0" maxOccurs="unbounded"/>
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="item">
+    <xs:complexType>
+      <xs:all>
+        <xs:element name="computer" type="xs:string"/>
+        <xs:element name="account" type="xs:string"/>
+        <xs:element name="date" type="xs:date"/>
+        <xs:element name="usage" type="xs:decimal"/>
+        <xs:element ref="details" minOccurs="0" maxOccurs="1"/>
+      </xs:all>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="details">
+    <xs:complexType>
+      <xs:element ref="line" minOccurs="1" maxOccurs="unbounded"/>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="line">
+    <xs:complexType>
+      <xs:all>
+        <xs:element name="drive" type="xs:string"/>
+        <xs:element name="remote" type="xs:string"/>
+        <xs:element name="start" type="xs:time"/>
+        <xs:element name="duration" type="xs:integer"/>
+        <xs:element name="bytes" type="xs:integer"/>
+      </xs:all>
+    </xs:complexType>
+  </xs:element>
+</xs:schema>