<?xml version="1.0" encoding="utf-8"?>

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<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:simpleType name="periodType">

    <xs:restriction base="xs:string">

      <xs:enumeration value="beginChunk" />

      <xs:enumeration value="endChunk" />

      <xs:enumeration value="everyChunk" />

    </xs:restriction>

  </xs:simpleType>

    <xs:simpleType name="transitionType">

    <xs:restriction base="xs:string">

      <xs:enumeration value="from" />

      <xs:enumeration value="to" />

    </xs:restriction>

  </xs:simpleType> 

  <xs:element name="Metadata">

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      <xs:sequence>

        <xs:choice maxOccurs="unbounded">

          <xs:element maxOccurs="unbounded" name="Event">

            <xs:complexType>

              <xs:sequence>

                <xs:element maxOccurs="unbounded" name="Field">

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                    <xs:attribute name="type" type="xs:NMTOKEN" use="required" />

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                    <xs:attribute name="label" type="xs:string" use="required" />

                    <xs:attribute name="description" type="xs:string" use="optional" />

                    <xs:attribute name="contentType" type="xs:string" use="optional" />

                    <xs:attribute name="relation" type="xs:string" use="optional" />

                    <xs:attribute name="experimental" type="xs:boolean" use="optional" />

                    <xs:attribute name="transition" type="transitionType" use="optional" />

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              <xs:attribute name="experimental" type="xs:boolean" use="optional" />

              <xs:attribute name="thread" type="xs:boolean" use="optional" />

              <xs:attribute name="startTime" type="xs:boolean" use="optional" />

              <xs:attribute name="stackTrace" type="xs:boolean" use="optional" />

              <xs:attribute name="period" type="periodType" use="optional" />

              <xs:attribute name="cutoff" type="xs:boolean" use="optional" />

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                    <xs:attribute name="experimental" type="xs:boolean" use="optional" />

                    <xs:attribute name="relation" type="xs:string" use="optional" />

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            </xs:complexType>

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          <xs:element name="XmlType">

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              <xs:attribute name="javaType" type="xs:NMTOKEN" use="optional" />

              <xs:attribute name="unsigned" type="xs:boolean" use="optional" />

              <xs:attribute name="parameterType" type="xs:string" use="required" />

              <xs:attribute name="fieldType" type="xs:string" use="required" />

             </xs:complexType>

          </xs:element>

          <xs:element name="XmlContentType">

            <xs:complexType>

              <xs:attribute name="name" type="xs:NMTOKEN" use="required" />

            </xs:complexType>

          </xs:element>

          <xs:element name="Relation">

            <xs:complexType>

              <xs:attribute name="name" type="xs:NMTOKEN" use="required" />

            </xs:complexType>

          </xs:element>

        </xs:choice>

      </xs:sequence>

    </xs:complexType>

  </xs:element>

</xs:schema>