sort — Metaproxy Z39.50 Sort Module
This filter performs sorting of Z39.50 result sets. The sorting criteria is selected via an X-Path expression. Only XML records are supported. The sorting is done only for the first present request following a search. The number of records to prefetch is configurable. For example, if a client asks initially for 10 records this module may extend that, and fetch more records and only return the results in the 10 record window - after sorting.
The configuration is given as attribute inside element
sort. This element must occur exactly once. Future
versions of the sort module may include multiple sort elements.
The attributes within sort are:
Specifies the X-Path expression that picks the sorting data from the record.
Allows one or more namespaces to be declared with a user-defined prefix. Each prefix may be referred to within the xpath expression.
Number of records to prefetch.
Is a boolean value (false, true). If true, the sort module will sort ascending. If false, the sort module will sort descending. If omitted, the sort order will be ascending.
# Metaproxy XML config file schemas
#
# Copyright (C) Index Data
# See the LICENSE file for details.
namespace mp = "http://indexdata.com/metaproxy"
filter_sort =
attribute type { "sort" },
attribute id { xsd:NCName }?,
attribute name { xsd:NCName }?,
element mp:sort {
attribute prefetch { xsd:integer }?,
attribute xpath { xsd:string },
attribute namespaces { xsd:string }?,
attribute ascending { xsd:boolean }?,
attribute debug { xsd:boolean }?
}