<?xml version="1.0"?>
<xs:schema
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns="http://pmd.sf.net/ruleset/1.0.0"
  targetNamespace="http://pmd.sf.net/ruleset/1.0.0"
  elementFormDefault="qualified">

  <xs:element name="ruleset">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="description" minOccurs="1" maxOccurs="1" />
        <xs:element ref="exclude-pattern" minOccurs="0" maxOccurs="unbounded" />
        <xs:element ref="include-pattern" minOccurs="0" maxOccurs="unbounded" />
        <xs:element ref="rule" minOccurs="1" maxOccurs="unbounded" />
      </xs:sequence>
      <xs:attribute name="name" type="xs:string" use="required" />
      <xs:attribute name="language" type="xs:string" use="optional">
	    <xs:annotation>
	      <xs:documentation source="version">1.0.0+</xs:documentation>
	      <xs:documentation source="description">
            Language on which this ruleset applies;
            e.g. "java" (default), "jsp"
	      </xs:documentation>
	    </xs:annotation>
      </xs:attribute>
    </xs:complexType>
  </xs:element>

  <xs:element name="description" type="xs:string">
  </xs:element>

  <xs:element name="include-pattern" type="xs:string">
  </xs:element>

  <xs:element name="exclude-pattern" type="xs:string">
  </xs:element>

  <xs:element name="rule">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="description" minOccurs="0" maxOccurs="1" />
        <xs:element ref="priority" minOccurs="0" maxOccurs="1"/>
        <xs:element ref="properties" minOccurs="0" maxOccurs="1" />
        <xs:element ref="exclude" minOccurs="0" maxOccurs="unbounded" />
        <xs:element ref="example" minOccurs="0" maxOccurs="unbounded" />
      </xs:sequence>
      <xs:attribute name="name" type="xs:ID" use="optional" />
      <xs:attribute name="since" type="xs:string" use="optional" />
      <xs:attribute name="ref" type="xs:string" use="optional" />
      <xs:attribute name="message" type="xs:string" use="optional" />
      <xs:attribute name="externalInfoUrl" type="xs:string" use="optional" />
      <xs:attribute name="class" type="xs:NMTOKEN" use="optional" />
      <xs:attribute name="dfa" type="xs:boolean" use="optional" />  <!-- rule uses dataflow analysis -->
      <xs:attribute name="typeResolution" type="xs:boolean" default="false" use="optional" />
    </xs:complexType>
  </xs:element>

  <xs:element name="example" type="xs:string"/>

  <!-- Default priority is the lowest -->
  <xs:element name="priority" type="xs:int" default="5"/>

  <xs:element name="properties">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="property" minOccurs="1" maxOccurs="unbounded" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name="property">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="value" minOccurs="0" maxOccurs="1" />
      </xs:sequence>
      <xs:attribute name="name" type="xs:NMTOKEN" use="required" />
      <xs:attribute name="value" type="xs:string" use="optional" />
      <xs:attribute name="description" type="xs:string" use="optional" />
      <xs:attribute name="pluginname" type="xs:NMTOKEN" use="optional" />
    </xs:complexType>
  </xs:element>

  <xs:element name="value" type="xs:string">
  </xs:element>

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

</xs:schema>
