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> 3.3.10 reference manual: Full-featured search engine software</TH
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><H1
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><A
NAME="tags"
>Tags</A
></H1
><A
NAME="AEN3725"
></A
><P
>Tag is a special character string parameter
which can be assigned to a set
of documents to group them into a logical subsection of the
search database. At search time you can specify a
tag value to limit searches to only a desired group.
You can also pass the tag limit to
<SPAN
CLASS="application"
>indexer</SPAN
> to have it
re-crawl only the given group of the documents,
or perform any other actions on the group,
like watching statistics for the group,
deleting the documents belonging to the group and so on.
</P
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="tags-adding"
>Adding tags</A
></H2
><P
> Use the <B
CLASS="command"
><A
HREF="msearch-cmdref-tag.html"
>Tag</A
></B
>
command in <TT
CLASS="filename"
>indexer.conf</TT
> to assign
a tag value to a site, a site part, or a group of sites.
For example:
<PRE
CLASS="programlisting"
> Tag cars
Server http://www.ford.com/
Server http://www.toyota.com/
Tag computers
Server http://www.sun.com/
Server http://www.apple.com/
</PRE
>
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="tags-search"
>Using tags at search time</A
></H2
><P
> When sending a search query, you can specify a tag value
to limit searches to the desired subsection of the database
with help of the <CODE
CLASS="parameter"
>t</CODE
> parameter
to <SPAN
CLASS="application"
>search.cgi</SPAN
>.
You may find useful to add a <TT
CLASS="literal"
>SELECT</TT
>
search form variable into the search form
in <TT
CLASS="filename"
>search.htm</TT
>:
<PRE
CLASS="programlisting"
> Search through:
<SELECT NAME="t">
<OPTION VALUE="">All sites</OPTION>
<OPTION VALUE="cars">Cars</OPTION>
<OPTION VALUE="computers">Computers</OPTION>
</SELECT>
</PRE
>
Take a look into <A
HREF="msearch-cmdref-tag.html"
>Tag</A
>,
<TT
CLASS="filename"
>indexer.conf-dist</TT
> and <TT
CLASS="filename"
>search.htm-dist</TT
> for more details and examples.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="tags-substring"
>Using substring tag match</A
></H2
><P
> Starting from the version <TT
CLASS="literal"
>3.1.x</TT
>,
tags are stored in the database as character strings
and support patterns with help of <ACRONYM
CLASS="acronym"
>SQL</ACRONYM
>
<B
CLASS="command"
>LIKE</B
> operator with
<TT
CLASS="literal"
>_</TT
> and <TT
CLASS="literal"
>%</TT
> wildcards
and thus support substring searches on tags.
</P
><P
> <P
><B
>Nested tags</B
></P
>
<ACRONYM
CLASS="acronym"
>SQL</ACRONYM
> <B
CLASS="command"
>LIKE</B
> patterns
also make possible to have nested tag. For example,
the documents with the tag value <TT
CLASS="literal"
>computers-hardware</TT
>
can be found using any of the following tag patters:
<TT
CLASS="literal"
>computers-%</TT
>, <TT
CLASS="literal"
>computers-hardware</TT
>,
<TT
CLASS="literal"
>%-hardware</TT
>.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="tags-multiple"
>Multiple selections</A
></H2
><P
> Playing with <B
CLASS="command"
>LIKE</B
> wildcards
you can make a document match multiple tag selections.
For example, the tag <TT
CLASS="literal"
>ABCDE</TT
> will match
all of the following patterns:
<PRE
CLASS="programlisting"
> _BCDE
A_CDE
AB_DE
ABC_E
ABCD_
</PRE
>
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="tags-indexer"
>Using tags with <SPAN
CLASS="application"
>indexer</SPAN
></A
></H2
><P
> To limit an <SPAN
CLASS="application"
>indexer</SPAN
> action to a
desired tag use the <CODE
CLASS="option"
>-t</CODE
> command line option.
For example:
<PRE
CLASS="programlisting"
> indexer -t cars -S
</PRE
>
will display statistics for the documents associated
with the tag <TT
CLASS="literal"
>cars</TT
>.
</P
><P
> You can also
use multiple <CODE
CLASS="option"
>-t</CODE
> options. For example:
<PRE
CLASS="programlisting"
> indexer -t cars -t computers -am
</PRE
>
will mark all documents from the tags <TT
CLASS="literal"
>cars</TT
>
and <TT
CLASS="literal"
>computers</TT
> as <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>expired</I
></SPAN
>
and will re-crawl to these documents forcing full update
information about the documents.
</P
><P
> The <CODE
CLASS="option"
>-t</CODE
> command line option also understands
<ACRONYM
CLASS="acronym"
>SQL</ACRONYM
> <B
CLASS="command"
>LIKE</B
> patterns.
This command:
<PRE
CLASS="programlisting"
> indexer -t "c%" -C
</PRE
>
will delete information about all documents associated with
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>any</I
></SPAN
> tag starting with the
letter <TT
CLASS="literal"
>c</TT
> from the search database.
</P
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