parameters.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema attributeFormDefault="unqualified"
           elementFormDefault="qualified"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns="http://reporting.pentaho.org/namespaces/parameter/1.0"
           targetNamespace="http://reporting.pentaho.org/namespaces/parameter/1.0">

  <xs:element name="parameters" type="parametersType"/>

  <xs:complexType name="parametersType">
    <xs:sequence>
      <xs:element type="parameterType" name="parameter" maxOccurs="unbounded" minOccurs="0"/>
      <xs:element type="outputParameterType" name="output-parameter" maxOccurs="unbounded" minOccurs="0"/>
      <xs:element type="errorsType" name="errors" maxOccurs="unbounded" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute type="xs:boolean" name="show-parameter-ui" use="optional"/>
    <xs:attribute type="xs:boolean" name="is-prompt-needed" use="optional"/>
    <xs:attribute type="xs:boolean" name="paginate" use="optional"/>
    <xs:attribute type="xs:boolean" name="subscribe" use="optional"/>
    <xs:attribute type="xs:string" name="layout" use="optional"/>
    <xs:attribute type="xs:int" name="accepted-page" use="optional"/>
    <xs:attribute type="xs:int" name="page-count" use="optional"/>
    <xs:attribute type="xs:boolean" name="autoSubmit" use="optional"/>
    <xs:attribute type="xs:boolean" name="autoSubmitUI" use="optional"/>
  </xs:complexType>

  <xs:complexType name="outputParameterType">
    <xs:attribute type="xs:string" name="name" use="required"/>
    <!-- whatever else you need -->
  </xs:complexType>
  <xs:complexType name="parameterType">
    <xs:sequence>
      <xs:element type="attributeType" name="attribute" maxOccurs="1" minOccurs="0"/>
      <xs:element type="valuesType" name="values" maxOccurs="1" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute type="xs:string" name="name" use="required"/>
    <xs:attribute type="xs:string" name="type" use="required"/>
    <xs:attribute type="xs:string" name="timezone-hint" use="required"/>
    <xs:attribute type="xs:boolean" name="is-strict" use="optional"/> <!-- was is-strict -->
    <xs:attribute type="xs:boolean" name="is-multi-select" use="optional"/>
    <xs:attribute type="xs:boolean" name="is-mandatory" use="optional"/>
  </xs:complexType>

  <xs:complexType name="errorsType">
    <xs:sequence>
      <xs:element type="errorType" name="error" maxOccurs="unbounded" minOccurs="0"/>
      <xs:element type="globalErrorType" name="global-error" maxOccurs="unbounded" minOccurs="0"/>
    </xs:sequence>

  </xs:complexType>

  <xs:complexType name="errorType">
    <xs:attribute type="xs:string" name="message" use="required"/>
    <xs:attribute type="xs:string" name="parameter" use="required"/>
  </xs:complexType>

  <xs:complexType name="globalErrorType">
    <xs:attribute type="xs:string" name="message" use="required"/>
  </xs:complexType>

  <xs:complexType name="valuesType">
    <xs:sequence>
      <xs:element type="valueType" name="value" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="valueType">
    <xs:attribute type="xs:string" name="label" use="optional"/>
    <xs:attribute type="xs:string" name="type" use="required"/>
    <xs:attribute type="xs:string" name="value" use="required"/>
    <xs:attribute type="xs:boolean" name="selected" use="required"/>
  </xs:complexType>

  <xs:complexType name="attributeType">
    <xs:attribute type="xs:string" name="namespace" use="required"
                  default="http://reporting.pentaho.org/namespaces/engine/parameter-attributes/core"/>
    <xs:attribute type="xs:string" name="name" use="required"/>
    <xs:attribute type="xs:string" name="value" use="required"/>
  </xs:complexType>
</xs:schema>