<!ENTITY % common SYSTEM "common/common.ent">
%common;
]>
-<!-- $Id: pazpar2_conf.xml,v 1.15 2007-04-09 05:01:32 quinn Exp $ -->
+<!-- $Id: pazpar2_conf.xml,v 1.23 2007-04-24 04:37:58 quinn Exp $ -->
<refentry id="pazpar2_conf">
<refentryinfo>
<productname>Pazpar2</productname>
</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 1.23 2007-04-24 04:37:58 quinn 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>
</varlistentry>
<varlistentry>
- <term>pz:syntax</term>
+ <term>pz:requestsyntax</term>
<listitem>
<para>
This specifies the record syntax to use when requesting
- records from a given server.
+ records from a given server. The value can be a symbolic name like
+ marc21 or xml, or it can be a Z39.50-style dot-separated OID.
</para>
</listitem>
</varlistentry>
<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>
</para>
</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>
+ This setting can't be 'set' -- it contains the ID (normally
+ ZURL) for a given target, and is useful for filtering --
+ specifically when you want to select one or more specific
+ targets in the search command.
+ </para>
+ </listitem>
+ </varlistentry>
</variablelist>
</refsect2>
projects / pazpar2-moved-to-github.git / blobdiff