<xsd:schema
     xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
     xmlns:xqx="http://www.w3.org/2005/XQueryX"
     xmlns:xqxft="http://www.w3.org/2007/xpath-full-text"
     targetNamespace="http://www.w3.org/2007/xpath-full-text"
     elementFormDefault="qualified" 
     attributeFormDefault="unqualified">

<!-- Initial creation                         2006-08-17: Jim Melton       -->
<!-- First version believed complete          2006-08-29: Jim Melton       -->
<!-- Cleaned up naming                        2007-04-27: Mary Holstege    -->     
<!-- Revised to align with updated syntax     2008-01-14: Jim Melton       -->
<!-- Comments added to clarify each element   2008-11-12: Jim Melton       -->
<!-- Add element decl for ftMatchOptions      2009-07-06: Michael Dyck     -->

  <xsd:import namespace="http://www.w3.org/2005/XQueryX"
              schemaLocation="http://www.w3.org/2005/XQueryX/xqueryx.xsd"/>

  <!-- FTMatchOption                                                       -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTMatchOption ::= FTLanguageOption                                -->
  <!--                   | FTWildCardOption                                -->
  <!--                   | FTThesaurusOption                               -->
  <!--                   | FTStemOption                                    -->
  <!--                   | FTCaseOption                                    -->
  <!--                   | FTDiacriticsOption                              -->
  <!--                   | FTStopWordOption                                -->
  <!--                   | FTExtensionOption                               -->
  <xsd:complexType name="ftMatchOption" />

  <xsd:element name="ftMatchOption" type="xqxft:ftMatchOption"
               abstract="true" />
  

  <!-- Represents the following grammar productions:                       -->
  <!--   FTMatchOptions ::= ( "using" FTMatchOption )+                     -->
  <xsd:complexType name="ftMatchOptions">
    <xsd:sequence minOccurs="1" maxOccurs="unbounded">
      <xsd:element ref="xqxft:ftMatchOption"/>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:element name="ftMatchOptions" type="xqxft:ftMatchOptions"/>
  

  <!-- ftMatchOption alternative: case                                     -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTCaseOption ::= ("case" "insensitive")                           -->
  <!--                  | ("case" "sensitive")                             -->
  <!--                  | "lowercase"                                      -->
  <!--                  | "uppercase"                                      -->
  <xsd:complexType name="ftCaseOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption" >
        <xsd:sequence>
          <xsd:element name="value">
            <xsd:simpleType>
              <xsd:restriction base="xsd:string">
                <xsd:enumeration value="lowercase"/>
                <xsd:enumeration value="uppercase"/>
                <xsd:enumeration value="case sensitive"/>
                <xsd:enumeration value="case insensitive"/>
              </xsd:restriction>
            </xsd:simpleType>
          </xsd:element>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="case" type="xqxft:ftCaseOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- ftMatchOption alternative: diacritics                               -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTDiacriticsOption ::= ("diacritics" "insensitive")               -->
  <!--                        | ("diacritics" "sensitive")                 -->
  <xsd:complexType name="ftDiacriticsOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption" >
        <xsd:sequence>
          <xsd:element name="value">
            <xsd:simpleType>
              <xsd:restriction base="xsd:string">
                <xsd:enumeration value="diacritics sensitive"/>
                <xsd:enumeration value="diacritics insensitive"/>
              </xsd:restriction>
            </xsd:simpleType>
          </xsd:element>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
  
  <xsd:element name="diacritics" type="xqxft:ftDiacriticsOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- ftMatchOption alternative: stemming                                 -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTStemOption ::= ("stemming") | ("no" "stemming")                 -->
  <xsd:complexType name="ftStemOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption" >
        <xsd:sequence>
          <xsd:element name="value">
            <xsd:simpleType>
              <xsd:restriction base="xsd:string">
                <xsd:enumeration value="stemming" /> 
                <xsd:enumeration value="no stemming" /> 
              </xsd:restriction>
            </xsd:simpleType>
          </xsd:element>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
  
  <xsd:element name="stem" type="xqxft:ftStemOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- ftMatchOption alternative: thesaurus                                -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTThesaurusID ::= "at" URILiteral ("relationship" StringLiteral)? -->
  <!--                       (FTRange "levels")?                           -->
  <xsd:complexType name="ftThesaurusID">
    <xsd:sequence>
      <xsd:element name="at" type="xsd:anyURI" />
      <xsd:element name="relationship" type="xsd:string" minOccurs="0" />
      <xsd:element name="levels" type="xqxft:ftRange" minOccurs="0" />
    </xsd:sequence>
  </xsd:complexType>

  <!-- Represents the following grammar productions:                       -->
  <!--   ... (FTThesaurusID | "default")                                   -->
  <!--   ... "(" (FTThesaurusID | "default") ("," FTThesaurusID)* ")")     -->
  <xsd:complexType name="thesaurusSpecSequence">
    <xsd:sequence>
      <xsd:choice>
        <xsd:element name="default" />
        <xsd:element name="thesaurusID"
                     type="xqxft:ftThesaurusID" />
      </xsd:choice>
      <xsd:element name="thesaurusID" type="xqxft:ftThesaurusID"
                   minOccurs="0" maxOccurs="unbounded" />
    </xsd:sequence>
  </xsd:complexType>

  <!-- Represents the following grammar productions:                       -->
  <!--   FTThesaurusOption ::=                                             -->
  <!--       ("thesaurus" (FTThesaurusID | "default"))                     -->
  <!--     | ("thesaurus"                                                  -->
  <!--          "(" (FTThesaurusID | "default") ("," FTThesaurusID)* ")")  -->
  <!--     | ("no" "thesaurus")                                            -->
  <xsd:complexType name="ftThesaurusOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption" >
        <xsd:choice>
          <xsd:element name="noThesauri" />
          <xsd:element name="thesauri" type="xqxft:thesaurusSpecSequence" />
        </xsd:choice>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="thesaurus" type="xqxft:ftThesaurusOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- ftMatchOption alternative: stopwords                                -->
  <!-- Represents the following grammar productions:                       -->
  <!--     FTStopWords ::= ("at" URILiteral)                               -->
  <!--   | ("(" StringLiteral ("," StringLiteral)* ")")                    -->
  <xsd:complexType name="ftStopWords">
    <xsd:choice>
      <xsd:element name="ref" type="xsd:anyURI" />
      <xsd:element name="list">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element ref="xqx:stringConstantExpr"
                         minOccurs="1" maxOccurs="unbounded" />
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
    </xsd:choice>
  </xsd:complexType>

  <xsd:element name="ftStopWords" type="xqxft:ftStopWords" />


  <!-- Represents the following grammar productions:                       -->
  <!--   ... "stop" "words" FTStopWords ...                                -->
  <!--   ... "stop" "words" "default" ...                                  -->
  <xsd:group name="baseStopWords">
    <xsd:choice>
      <xsd:element name="default" />
      <xsd:element ref="xqxft:ftStopWords" />
    </xsd:choice>
  </xsd:group>

  <!-- Represents the following grammar productions:                       -->
  <!--   FTStopWordsInclExcl ::= ("union" | "except") FTStopWords          -->
  <xsd:complexType name="ftStopWordsInclExcl">
    <xsd:choice>
      <xsd:element name="union" type="xqxft:ftStopWords" />
      <xsd:element name="except" type="xqxft:ftStopWords" />
    </xsd:choice>
  </xsd:complexType>

  <!-- Represents the following grammar productions:                       -->
  <!--   ... ("using" "stop" "words" FTStopWords FTStopWordsInclExcl*) ... -->
  <!--   ... ("using" "default" "stop" "words" FTStopWordsInclExcl*) ...   -->
  <xsd:complexType name="stopWordsSpecSequence">
    <xsd:sequence>
      <xsd:group ref="xqxft:baseStopWords" />
      <xsd:element name="ftStopWordsInclExcl"
                   type="xqxft:ftStopWordsInclExcl"
                   minOccurs="0" maxOccurs="unbounded" />
    </xsd:sequence>
  </xsd:complexType>

  <!-- Represents the following grammar productions:                       -->
  <!--   FTStopWordOption ::=                                              -->
  <!--       ("stop" "words" FTStopWords FTStopWordsInclExcl*)             -->
  <!--     | ("stop" "words" "default" FTStopWordsInclExcl*)               -->
  <!--     | ("no" "stop" "words")                                         -->
  <xsd:complexType name="ftStopWordOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption" >
        <xsd:choice>
          <xsd:element name="noStopwords" />
          <xsd:element name="stopwords" type="xqxft:stopWordsSpecSequence" />
        </xsd:choice>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="stopword" type="xqxft:ftStopWordOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- ftMatchOption alternative: language                                 -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTLanguageOption ::= "language" StringLiteral                     -->
  <xsd:complexType name="ftLanguageOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption" >
        <xsd:sequence>
          <xsd:element name="value" type="xsd:string" />
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="language" type="xqxft:ftLanguageOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- ftMatchOption alternative: wildcards                                -->
  <!-- Represents the following grammar productions:                       -->
  <!--   FTWildCardOption ::= ("wildcards")                                -->
  <!--                      | ("no" "wildcards")                           -->
  <xsd:complexType name="ftWildCardOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption">
        <xsd:sequence>
          <xsd:element name="value">
            <xsd:simpleType>
              <xsd:restriction base="xsd:string">
                <xsd:enumeration value="wildcards" /> 
                <xsd:enumeration value="no wildcards" />
              </xsd:restriction>
            </xsd:simpleType>
          </xsd:element>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="wildcard" type="xqxft:ftWildCardOption"
               substitutionGroup="xqxft:ftMatchOption" />


  <!-- Represents the following grammar productions:                       -->
  <!--   FTExtensionOption ::= "option" QName StringLiteral                -->
  <xsd:complexType name="ftExtensionOption">
    <xsd:complexContent>
      <xsd:extension base="xqxft:ftMatchOption">
        <xsd:sequence>
          <xsd:element name="ftExtensionName" type="xqx:QName"/>
          <xsd:element name="ftExtensionValue" type="xsd:string"/>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>

  <xsd:element name="ftExtensionOption" type="xqxft:ftExtensionOption"
               substitutionGroup="xqxft:ftMatchOption" />

</xsd:schema>