<!ENTITY % common SYSTEM "common/common.ent">
%common;
]>
-<!-- $Id: pazpar2_conf.xml,v 1.17 2007-04-11 02:18:04 quinn Exp $ -->
+<!-- $Id: pazpar2_conf.xml,v 1.24 2007-05-25 12:30:27 marc Exp $ -->
<refentry id="pazpar2_conf">
<refentryinfo>
<productname>Pazpar2</productname>
</varlistentry>
<varlistentry>
+ <term>icu_chain</term>
+ <listitem>
+ <para>
+ Definition of ICU tokenization and normalization rules
+ are used if ICU support is compiled in. The 'id'
+ attribute is currently not used, and the 'locale'
+ attribute must be set to one of the locale strings
+ defined in ICU. The child elements listed below can be
+ in any order, except the 'index' element which logically
+ belongs to the end of the list. The stated tokenization,
+ normalization and charmapping instructions are performed
+ in order from top to bottom.
+ </para>
+ <variablelist> <!-- Level 2 -->
+ <varlistentry><term>casemap</term>
+ <listitem>
+ <para>
+ The attribure 'rule' defines the direction of the
+ per-character casemapping, allowed values are "l"
+ (lower), "u" (upper), "t" (title).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>normalize</term>
+ <listitem>
+ <para>
+ Normalization and transformation of tokens follows
+ the rules defined in the 'rule' attribute. For
+ possible values we refer to the extensive ICU
+ documentation found at the
+ <ulink url="&url.icu.transform;">ICU
+ transformation</ulink> home page. Set filtering
+ principles are explained at the
+ <ulink url="&url.icu.unicode.set;">ICU set and
+ filtering</ulink> page.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>tokenize</term>
+ <listitem>
+ <para>
+ Tokenization is the only rule in the ICU chain
+ which splits one token into multiple tokens. The
+ 'rule' attribute may have the following values:
+ "s" (sentence), "l" (line-break), "w" (word), and
+ "c" (character), the later probably not beeing
+ very useful in a runing pazpar2 installation.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>index</term>
+ <listitem>
+ <para>
+ Finally the 'index' element instruction - without
+ any 'rule' attribute - is used to store the tokens
+ after chain processing in the relevance ranking
+ unit of Pazpar2. It will always be the last
+ instruction in the chain.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term>service</term>
<listitem>
<para>
<listitem>
<para>
This is the name of the data element. It is matched
- against the 'type' attribute of the 'metadata' element
+ against the 'type' attribute of the
+ 'metadata' element
in the normalized record. A warning is produced if
- metdata elements with an unknown name are found in the
- normalized record. This name is also used to represent
+ metdata elements with an unknown name are
+ found in the
+ normalized record. This name is also used to
+ represent
data elements in the records returned by the
webservice API, and to name sort lists and browse
facets.
<varlistentry><term>rank</term>
<listitem>
<para>
- Specifies that this element is to be used to help rank
+ Specifies that this element is to be used to
+ help rank
records against the user's query (when ranking is
requested). The value is an integer, used as a
multiplier against the basic TF*IDF score. A value of
- 1 is the base, higher values give additional weight to
+ 1 is the base, higher values give additional
+ weight to
elements of this type. The default is '0', which
excludes this element from the rank calculation.
</para>
termlist, or browse facet. Values are tabulated from
incoming records, and a highscore of values (with
their associated frequency) is made available to the
- client through the webservice API. The possible values
+ client through the webservice API.
+ The possible values
are 'yes' and 'no' (default).
</para>
</listitem>
<!-- <zproxy host="localhost:9000"/> -->
<!-- <zproxy port="9000"/> -->
+
+ <!-- optional ICU ranking configuration example -->
+ <!--
+ <icu_chain id="el:word" locale="el">
+ <normalize rule="[:Control:] Any-Remove"/>
+ <tokenize rule="l"/>
+ <normalize rule="[[:WhiteSpace:][:Punctuation:]] Remove"/>
+ <casemap rule="l"/>
+ <index/>
+ </icu_chain>
+ -->
+
<service>
<metadata name="title" brief="yes" sortkey="skiparticle" merge="longest" rank="6"/>
<metadata name="isbn" merge="unique"/>
</para>
</refsect1>
- <refsect1><title>TARGET SETTINGS</title>
+ <refsect1 id="target_settings"><title>TARGET SETTINGS</title>
<para>
Pazpar2 features a cunning scheme by which you can associate various
- kinds of attributes, or settings with search targets. This is done
- through XML files; each file can associate one or more settings
- with one or more targets. The file format is generic in nature,
- designed to support a wide range of application requirements. The
+ kinds of attributes, or settings with search targets. This can be done
+ through XML files which are read at startup; each file can associate
+ one or more settings with one or more targets. The file format is generic
+ in nature, designed to support a wide range of application requirements. The
settings can be purely technical things, like, how to perform a title
search against a given target, or it can associate arbitrary name=value
pairs with groups of targets -- for instance, if you would like to
place all commercial full-text bases in one group for selection
- purposes, or you would like to control what targets are accessible to a
- given user.
+ purposes, or you would like to control what targets are accessible
+ to users by default.
</para>
<para>
process any settings files found therein.
</para>
+ <para>
+ Clients of the pazpar2 webservice interface can selectively override
+ settings for individual targets within the scope of one session. This
+ can be used in conjunction with an external authentication system to
+ determine which resources are to be accessible to which users. Pazpar2
+ itself has no notion of end-users, and so can be used in conjunction
+ with any type of authentication system. Similarly, the authentication
+ tokens submitted to access-controlled search targets can similarly be
+ overriden, to allow use of pazpar2 in a consortial or multi-library
+ environment, where different end-users may need to be represented to
+ some search targets in different ways. This, again, can be managed
+ using an external database or other lookup mechanism. Setting overrides
+ can be performed either using the 'init' or the 'settings' webservice
+ command (see XXX ref to pazpar2 protocol).
+ </para>
+
+ <para>
+ In fact, every setting that applies to a database (except pz:id, which
+ can only be used for filtering targets to use for a search) can be overriden
+ on a per-session basis. This allows the client to override specific CCL fields
+ for searching, etc., to meet the needs of a session or user.
+ </para>
+
+ <para>
+ Finally, as an extreme case of this, the webservice client can
+ introduce entirely new targets, on the fly, as part of the init or
+ settings command. This is useful if you desire to manage information
+ about your search targets in a separate application such as a database.
+ You do not need any static settings file whatsoever to run pazpar2 -- as
+ long as the webservice client is prepared to supply the necessary
+ information at the beginning of every session.
+ </para>
+
+ <para>
+ NOTE: The following discussion of practical issues related to session and settings
+ management are cast in terms of a user interface based on Ajax/Javascript
+ technology. It would apply equally well to many other kinds of browser-based logic.
+ </para>
+
+ <para>
+ Typically, a Javascript client is not allowed to directly alter the parameters
+ of a session. There are two reasons for this. One has to do with access
+ to information; typically, information about a user will be stored in a
+ system on the server side, or it will be accessible in some way from the server.
+ However, since the Javascript client cannot be entirely trusted (some hostile
+ agent might in fact 'pretend' to be a regular ws client), it is more robust
+ to control session sesttings from scripting that you run as part of your
+ webserver. Typically, this can be handled during the session initialization,
+ as follows:
+ </para>
+
+ <para>
+ Step 1: The Javascript client loads, and asks the webserver for a new pazpar2
+ session ID. This can be done using a Javascript call, for instance. Note that
+ it is possible to submit Ajax HTTPXmlRequest calls either to pazpar2 or to the
+ webserver that pazpar2 is proxying for. See (XXX Insert link to pazpar2 protocol).
+ </para>
+
+ <para>
+ Step 2: Code on the webserver authenticates the user, by database lookup,
+ LDAP access, NCIP, etc. Determines which resources the user has access to,
+ and any user-specific parameters that are to be applied during this session.
+ </para>
+
+ <para>
+ Step 3: The webserver initializes a new pazpar2 settings, and sets user-specific
+ parameters as necessary, using the init webservice command. A new session ID is
+ returned.
+ </para>
+
+ <para>
+ Step 4: The webserver returns this session ID to the Javascript client, which then
+ uses the session ID to submit searches, show results, etc.
+ </para>
+
+ <para>
+ Step 5: When the Javascript client ceases to use the session, pazpar2 destroys
+ any session-specific information.
+ </para>
+
<refsect2><title>SETTINGS FILE FORMAT</title>
<para>
Each file contains a root element named <settings>. It may
contain one or more <set> elements. The settings and set
- elements may contain the following attributes. Attributes in set
+ elements may contain the following attributes. Attributes in the set node
overrides those in the setting root element. Each set node must
specify (directly, or inherited from the parent node) at least a
target, name, and value.
</para>
</listitem>
</varlistentry>
- <varlistentry>
- <term>user</term>
- <listitem>
- <para>
- This specifies the user ID to which this setting applies. A
- given setting may have values for any number of users, or it
- may have a 'default' value which is applied when no user is
- specified, or when no user-specific value is available.
- </para>
- </listitem>
- </varlistentry>
<varlistentry>
<term>name</term>
<listitem>
</variablelist>
<para>
- By setting defaults for user, target, name, or value in the root
+ By setting defaults for target, name, or value in the root
settings node, you can use the settings files in many different
ways. For instance, you can use a single file to set defaults for
many different settings, like search fields, retrieval syntaxes,
within your application.
</para>
+ <para>
+ The following examples illustrate uses of the settings system to
+ associate settings with targets to meet different requirements.
+ </para>
+
+ <para>
+ The example below associates a set of default values that can be
+ used across many targets. Note the wildcard for targets.
+ This associates the given settings with all targets for which no
+ other information is provided.
+ <screen><![CDATA[
+<settings target="*">
+
+ <!-- This file introduces default settings for pazpar2 -->
+ <!-- $Id: pazpar2_conf.xml,v 1.24 2007-05-25 12:30:27 marc Exp $ -->
+
+ <!-- mapping for unqualified search -->
+ <set name="pz:cclmap:term" value="u=1016 t=l,r s=al"/>
+
+ <!-- field-specific mappings -->
+ <set name="pz:cclmap:ti" value="u=4 s=al"/>
+ <set name="pz:cclmap:su" value="u=21 s=al"/>
+ <set name="pz:cclmap:isbn" value="u=7"/>
+ <set name="pz:cclmap:issn" value="u=8"/>
+ <set name="pz:cclmap:date" value="u=30 r=r"/>
+
+ <!-- Retrieval settings -->
+
+ <set name="pz:requestsyntax" value="marc21"/>
+ <!-- <set name="pz:elements" value="F"/> NOT YET IMPLEMENTED -->
+
+ <!-- Result normalization settings -->
+
+ <set name="pz:nativesyntax" value="iso2709"/>
+ <set name="pz:xslt" value="../etc/marc21.xsl"/>
+
+</settings>
+
+ ]]></screen>
+ </para>
+
+ <para>
+ The next example shows certain settings overriden for one target,
+ one which returns XML records containing DublinCore elements, and
+ which furthermore requires a username/password.
+ <screen><![CDATA[
+<settings target="funkytarget.com:210/db1">
+ <set name="pz:requestsyntax" value="xml"/>
+ <set name="pz:nativesyntax" value="xml"/>
+ <set name="pz:xslt" value="../etc/dublincore.xsl"/>
+
+ <set name="pz:authentication" value="myuser/password"/>
+</settings>
+ ]]></screen>
+ </para>
+
+ <para>
+ The following example associates a specific name/value combination
+ with a number of targets. The targets below are access-restricted,
+ and can only be used by users with special credentials.
+ <screen><![CDATA[
+<settings name="pz:allow" value="0">
+ <set target="funkytarget.com:210/*"/>
+ <set target="commercial.com:2100/expensiveDb"/>
+</settings>
+ ]]></screen>
+ </para>
+
</refsect2>
<refsect2><title>RESERVED SETTING NAMES</title>
<listitem>
<para>
The element set name to be used when retrieving records from a
- server.
+ server (not yet implemented).
</para>
</listitem>
</varlistentry>
<term>pz:nativesyntax</term>
<listitem>
<para>
- The representation of the retrieval records. Currently
+ The representation (syntax) of the retrieval records. Currently
recognized values are iso2709 and xml.
</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>pz:encoding</term>
- <listitem>
<para>
- The native encoding of retrieval records. Can be anything
- recognized by conv, but typical values are marc8 and latin1.
- The default is UTF-8.
+ For iso2709, can also specify a native character set, e.g. "iso2709;latin-1".
+ If no character set is provided, MARC-8 is assumed.
</para>
</listitem>
</varlistentry>
</listitem>
</varlistentry>
<varlistentry>
+ <term>pz:maxrecs</term>
+ <listitem>
+ <para>
+ Controls the maximum number of records to be retrieved from a
+ server. The default is 100 (not yet implemented).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term>pz:id</term>
<listitem>
<para>
projects / pazpar2-moved-to-github.git / blobdiff