+
+ <para>
+ String indexes can be accessed directly,
+ independently which attribute set is in use. These are just
+ ignored. The above mentioned name normalization applies.
+ String index names are defined in the
+ used indexing filter configuration files, for example in the
+ <literal>&acro.grs1;</literal>
+ <filename>*.abs</filename> configuration files, or in the
+ <literal>alvis</literal> filter &acro.xslt; indexing stylesheets.
+ </para>
+
+ <para>
+ &zebra; internal indexes can be accessed directly,
+ according to the same rules as the user defined
+ string indexes. The only difference is that
+ &zebra; internal index names are hardwired,
+ all uppercase and
+ must start with the character <literal>'_'</literal>.
+ </para>
+
+ <para>
+ Finally, <literal>&acro.xpath;</literal> access points are only
+ available using the <literal>&acro.grs1;</literal> filter for indexing.
+ These access point names must start with the character
+ <literal>'/'</literal>, they are <emphasis>not
+ normalized</emphasis>, but passed unaltered to the &zebra; internal
+ &acro.xpath; engine. See <xref linkend="querymodel-use-xpath"/>.
+
+ </para>
+
+
+ </section>
+
+
+ <section id="querymodel-pqf-apt-mapping-structuretype">
+ <title>Mapping of &acro.pqf; &acro.apt; structure and completeness to
+ register type</title>
+ <para>
+ Internally &zebra; has in its default configuration several
+ different types of registers or indexes, whose tokenization and
+ character normalization rules differ. This reflects the fact that
+ searching fundamental different tokens like dates, numbers,
+ bitfields and string based text needs different rule sets.
+ </para>
+
+ <table id="querymodel-zebra-mapping-structure-types" frame="top">
+ <title>Structure and completeness mapping to register types</title>
+ <tgroup cols="4">
+ <thead>
+ <row>
+ <entry>Structure</entry>
+ <entry>Completeness</entry>
+ <entry>Register type</entry>
+ <entry>Notes</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry>
+ phrase (@attr 4=1), word (@attr 4=2),
+ word-list (@attr 4=6),
+ free-form-text (@attr 4=105), or document-text (@attr 4=106)
+ </entry>
+ <entry>Incomplete field (@attr 6=1)</entry>
+ <entry>Word ('w')</entry>
+ <entry>Traditional tokenized and character normalized word index</entry>
+ </row>
+ <row>
+ <entry>
+ phrase (@attr 4=1), word (@attr 4=2),
+ word-list (@attr 4=6),
+ free-form-text (@attr 4=105), or document-text (@attr 4=106)
+ </entry>
+ <entry>complete field' (@attr 6=3)</entry>
+ <entry>Phrase ('p')</entry>
+ <entry>Character normalized, but not tokenized index for phrase
+ matches
+ </entry>
+ </row>
+ <row>
+ <entry>urx (@attr 4=104)</entry>
+ <entry>ignored</entry>
+ <entry>URX/URL ('u')</entry>
+ <entry>Special index for URL web addresses</entry>
+ </row>
+ <row>
+ <entry>numeric (@attr 4=109)</entry>
+ <entry>ignored</entry>
+ <entry>Numeric ('n')</entry>
+ <entry>Special index for digital numbers</entry>
+ </row>
+ <row>
+ <entry>key (@attr 4=3)</entry>
+ <entry>ignored</entry>
+ <entry>Null bitmap ('0')</entry>
+ <entry>Used for non-tokenizated and non-normalized bit sequences</entry>
+ </row>
+ <row>
+ <entry>year (@attr 4=4)</entry>
+ <entry>ignored</entry>
+ <entry>Year ('y')</entry>
+ <entry>Non-tokenizated and non-normalized 4 digit numbers</entry>
+ </row>
+ <row>
+ <entry>date (@attr 4=5)</entry>
+ <entry>ignored</entry>
+ <entry>Date ('d')</entry>
+ <entry>Non-tokenizated and non-normalized ISO date strings</entry>
+ </row>
+ <row>
+ <entry>ignored</entry>
+ <entry>ignored</entry>
+ <entry>Sort ('s')</entry>
+ <entry>Used with special sort attribute set (@attr 7=1, @attr 7=2)</entry>
+ </row>
+ <row>
+ <entry>overruled</entry>
+ <entry>overruled</entry>
+ <entry>special</entry>
+ <entry>Internal record ID register, used whenever
+ Relation Always Matches (@attr 2=103) is specified</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ <!-- see in util/zebramap.c -->
+