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Index Terms - type-ahead, large data set, server side, online directory, search technique.
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Index Terms - type-ahead, large data set, server side, online directory, search technique.
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This presentation was provided by William Mattingly of the Smithsonian Institution, during the closing segment of the NISO training series "AI & Prompt Design." Session Eight: Limitations and Potential Solutions, was held on May 23, 2024.
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This presentation was provided by Kaveh Bazargan of River Valley Technologies, during the NISO webinar "Sustainability in Publishing." The event was held April 17, 2024.
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2. OASIS Search Web Services
Technical Committee
http://www.oasis-open.org/committees/search-ws
To define Search and Retrieval Web Services, combining
various current and ongoing web service activities.
3. OASIS Search Web Services
TC
Ray Denenberg—Library of Congress—Co-Chair
Matthew Dovey—JISC Executive—Co-Chair
Larry Dixson—Library of Congress—Voting Member
Janifer Gatenby—OCLC—Voting Member
Ralph LeVan—OCLC—Voting Member
Ashley Sanders—Univ. of Manchester—Voting Member
Robert Sanderson—Univ. of Liverpool—Voting Member
Sri Gopalan—Booz Allen Hamilton—Member
MacKenzie Smith—M.I.T. —Member
4. Who is OASIS
OASIS is a non-profit, international consortium that creates
interoperable industry specifications based on public
standards such as XML and SGML.
The ebXML suite of standards is probably their most famous
product
http://www.oasis-open.org
5. Why are we there?
We were hoping to reach a broader audience than we
normally see in NISO
We were hoping that there would be synergies with the
other XML-based standards groups. After all, most of them
have searching requirements.
6. Where We’ve Come From
Pros, Cons and What We’ve Learned
• Z39.50
• SRW/U
• OpenSearch
7. Z39.50
Pros
• High Functionality
• High Interoperability
Cons
• Complicated
• Binary encoding over raw tcp/ip
Lesson Learned
• There’s a need for a high functionality interface
• If people are desperate enough, they’ll do anything
8. SRU
Pros
• XML-based web service
• High Interoperability
Cons
• Still complicated (but much less than Z39.50!)
• Unheard of outside the library community
Lesson Learned
• There’s still a need for a high functionality interface
• If people aren’t desperate, they’ll live with what they’ve
got
9. OpenSearch
Pros
• Simple
• Moderate Interoperability
Cons
• Low Functionality
Lesson Learned
• There’s a need for a simple low functionality interface
• Developers prefer to do as little as possible
10. What We’re Doing
• CQL 1.2
• SRU 2.0
• Abstract Protocol Definition
• Binding to HTTP Get
• Binding to SRU 1.2
• Binding to OpenSearch
• SWS Description Language
11. CQL 1.2
This is the path to actually standardize CQL
Enhances a couple of features (sort and proximity and the
CQL Context Set)
12. SRU 2.0?
I wish I had something to say here, but it’s mostly on the
todo list and the SWS Description Language has more
traction in the committee.
13. Abstract Protocol Description (APD)
This document is an abstract protocol definition for the Search Web
Services (SWS) searchRetrieve operation. It presents the model
for the SearchRetrieve operation and is also intended to serve as
a guideline for the development of application protocol bindings
(hereafter bindings, see definitional note).
A binding describes the capabilities and general characteristic of a
server or search engine, and how it is to be accessed. A binding
may describe a class of servers via a human-readable document
or a binding may be a machine-readable file describing a single
server, provided by that server, according to the description
language described at xxx, which is a fundamental component of
the SWS standard
14. APD Data Model
A server exposes a datastore for access by a remote client for
purposes of search and retrieval. The datastore is a collection of
units of data. Such a unit is referred to as an item in this model.
For purposes of this model there is a single datastore at any
given server.
Associated with a datastore are one or more formats that may be
used for the transfer of items from the server to the client. Such
a format is referred to as an item type in this model. An item
type represents a common understanding shared by the client
and server of the information contained in the items of the
datastore, to allow the transfer of that information. The item
type identifies an abstract representation of the information. It
does not represent nor does it constrain the internal
representation or storage of that information at the server
15. APD Processing Model
A client sends a searchRetrieve request to a server, which responds
with a searchRetrieve response. The request includes a search
query to be matched against the items at the server’s datastore.
The server processes the query, creating a result set (see Result
Set Model) of items that match the query.
The request also indicates the desired number of items to be
included in the response and includes information about how the
individual items in the response, as well as the response at large,
are to be formatted.
The response includes items from the result set, diagnostic
information, and a result set identifier that the client may use in
a subsequent request to retrieve additional items.
16. APD Result Set Model
This is a logical model; support of result sets is not assumed
nor required by this standard
From the client's point of view, the result set is a set of
items each referenced by an ordinal number, beginning
with 1. The client may request a given item from a result
set according to a specific format. For example the client
may request item 1 in Dublin Core, and subsequently
request item 1 in MODS. The format in which items are
supplied is not a property of the result set, nor is it a
property of the requested items as a member of the result
set; the result set is simply the ordered list of items.
17. APD Request Parameters
Abstract Parameter
Name
Description
responseType e.g. 'text/html', ‘application/atom+xml’ ,
application/x+sru
query The search query of the request.
startPosition The position within the result set of the first item to be
returned.
maximumItems The number of items requested to be returned.
itemType e.g. string, jpeg, dc, iso2709. From list provided by
server.
sortOrder The requested order of the result set.
18. APD Response Parameters
Abstract Element Name Description
numberOfItems The number of items matched by the query.
resultSetId The identifier for the result set created by the
query.
items a sequence of items.
nextPosition The next position within the result set following
the final returned item.
Diagnostics Error message and/or diagnostics.
echoedSearchRetrieveRequest The server may echo the request back to the
client.
19. HTTP Get Binding
Syntax
The client sends a request via the HTTP GET method
Specifically it is an HTTP URL of the form:
<base URL>?<searchpart>
Encoding
Convert the value to UTF-8. Percent-encode characters
as necessary within the value. Construct a URI from the
parameter names and encoded values.
20. SRU 1.2 Binding
The APD + the HTTP Get Binding + new request parameters
(operation, version, recordPacking resultSetTTL stylesheet
extraRequestData) – unused base parameters (responseType,
sortOrder) + new response elements (version,
resultSetIdleTime, extraResponseData) and a shiny XML
encoding.
21. SWS Description Language
What do we think we’ve learned?
Developers are tired of being
told how to do their business!
Unless they have a business reason to worry about
interoperability, they won’t. Third party interoperability
needs to be something they can add on when they do
discover they need it. Better yet, let someone else add it
on.
22. Prescriptive vs Descriptive Standards
A prescriptive standard (Z39.50, SRU and the response part
of OpenSearch) causes interoperability by telling you how
to construct your interface, allowing for simple clients that
know how to talk to you. The hard work of interface is
done by the server.
A descriptive standard (WSDL and the request part of
OpenSearch) causes interoperability by allowing you to
describe your interface in such a way that clients can be
created dynamically to talk to you. The hard work of
interface is done by the client.
23. Who Wants This?
• Anyone who wants access to content that doesn’t adhere
to any search standards: Web 2.0 and NISO Metasearch!
• Anyone with content to provide who doesn’t know what
clients might want to search that content
27. P.S., Bibliographic Context Set Anyone?
SRU depends on context sets. The SRU Editorial Board
recognizes the need for context set for bibliographic
searching (equivalent to Bib-1 in the Z39.50 universe).
But, they don’t feel that they are the appropriate body.
Anyone in the NISO community interested?