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C:/app/Administrator/product/11.2.0/dbhome_1/RDBMS/xml/orarep/

files >> C:/app/Administrator/product/11.2.0/dbhome_1/RDBMS/xml/orarep/histogram.xsd

 <?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <xs:include schemaLocation="file://rdbms/xml/orarep/bucket.xsd" />
  <xs:element name="histogram">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="bucket" minOccurs="1" maxOccurs="unbounded" />
      </xs:sequence>
      <xs:attribute name="name" use="required" type="xs:string" />
    </xs:complexType>
  </xs:element>
</xs:schema>