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OPOW critique

by: Nishtha

OPOW critique INFO

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Team Process Product
Jennifer Booker
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This 4 page Bundle was uploaded by Nishtha on Wednesday May 18, 2016. The Bundle belongs to INFO at Drexel University taught by Jennifer Booker in Spring 2016. Since its upload, it has received 10 views. For similar materials see Team Process Product in 324 at Drexel University.


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Date Created: 05/18/16
OPOW – OAI­PMH Output Writer Software Requirements Specification 1 Introduction 1.1  Document Purpose This document is the System Requirements Specification for OPOW, the OAI­PMH  Output Writer.   1.2  OPOW Overview OPOW is a file re­formatting program that reads a plain text input file in one format,  converts the input to an XML format, and writes the re­formatted data to an output file. It reads a file of metadata about educational resources drawn from one or more repositories. The program reformats the input data and outputs it as an XML document that meets the  OAI­PMH standard. The resulting XML document can be made available on the Web  and harvested by Service Providers that can then provide searching of the educational  resources.   Figure 1 shows this context for OPOW.  In the figure, metadata for two repositories has  been put into a metadata file.  OPOW reads this file and outputs an XML file formatted  according to the OAI­PMH standard.  At some later, unspecified time, the XML file can  be harvested by a service provider. Repo Service  Metadata OPOW OAI­PMH Provider Repo Figure 1 ­ Overview of OPOW processing OPOW is being developed as part of the NSF­funded Ensemble project.  Ensemble is  building a distributed digital library of education materials for computing educators.  In  terms of the diagram above, Ensemble is a service provider.  Ensemble will harvest OAI­ PMH metadata and use that metadata to provide a single place to search many  repositories of computing education materials.  OPOW will be one path to connect the  repositories to Ensemble.  Ensemble can be viewed at  The  OAI­PMH data provided by OPOW will appear in the “Collections” section. 1 1.3  Definitions and Acronyms  Dublin Core ­ The Dublin Core metadata format is a standard in the fields of library and  computer science. It defines a standard set of terms that can be used to describe library or  digital repository contents.  The set of metadata elements is similar to the information  typically contained in a library catalog to describe a book or periodical.  A list of the core elements and definition of them is contained at: OAI­PMH ­ Open Archives Initiative Protocol for Metadata Harvesting­ This is a low­ barrier mechanism for repository interoperability. It involves the methodologies  associated with both harvesting and providing metadata about a collection of records.  Data Providers are repositories that expose structured metadata via OAI­PMH. Service  Providers then make OAI­PMH service requests to harvest that metadata. The  specification can be found at: In the context of OPOW, the metadata are elements that describe an educational resource  such as a test, an exam, a lecture, or a homework assignment.  The metadata elements are the Dublin Core elements.  OPOW takes a text file of metadata and converts it to the  XML format that OAI­PMH specifies a Data Provider should use to expose metadata for  harvesting. Repository ­ a collection of digital objects.  For OPOW, the repositories contain  educational resources.  OPOW does not interact with the repositories directly. Resource – an item in a repository.  For OPOW, resources are educational materials such as quizzes, tests, lectures, homework assignments, etc. 2 User Characteristics To be complete . 3 Specific Requirements 3.1 External Interface s 3.1.1 Data Interface OPOW will have two data interfaces.  Input file ­ The input interface is a plain text file that contains metadata (title,  subject, creator, date, etc) describing educational resources (lectures, tests,  2 assignments, etc.) contained in some digital repository. This file may be created by  some process outside of OPOW, or created by manual data entry within OPOW. Output file ­ The output interface is an XML file in OAI­PMH format. It will be  suitable for harvesting by a Service Provider as defined in the OAI­PMH context.   OPOW produces the file but is not responsible for making the file available for  harvesting. 3.1.2 User Interface The user interface of OPOW will provide editing access to the input file and to a set of program options . 3.2 Functions The statements below define the functional requirements for the system. 3.2.1 – Meta­data Conversion OPOW will convert a file of metadata into an XML file formatted according to  the OAI­PMH standard . 3.2.2 – Input File     OPOW will read input from a file with the following characteristics :  The input file will be plain text  The input file will have a layout that is visually easy for a person  to read and edit with a text editor  The input file consists of metadata that describes educational  resources.  The metadata for each resource will consist of pairs where each pair will be a metadata term and a value.  For example, a pair might be the term “creator” and the value “Smith, Jane”.  The metadata terms will be  some or all of the Dublin Core terms listed at the Web site referenced in  the Dublin Core definition above . 3.2.3 – Data Validatio n OPOW will verify that the input data meets the following criteria and produce an  error log for any discrepancies encountere d  Any metadat aterm may occur zero or more times for a given  resourc e  Metadata terms cannot be null  Metadata values can be null or any pattern of bytes  Files that contain data from more than one repository must  provide a repository ID for each resourc e 3  Files that contain data from a single repository need not provide a  repository ID OPOW will have a user controlled option that will produce a  warning message for any metadata term encountered in the input file that  is not in the Dublin Core set of term s  OPOW will provide a user configuration option to replace or  extend the set of metadata terms considered valid by OPOW.  The Dublin  Core metadata terms will be the default set if none are specified by the  user.  If the user specifies terms, those should be considered valid by  OPOW . 3.2. 4 ­ Output File OPOW will write an output file with the following characteristics:  The file will be valid XM L  The file content will meet the OAI­PMH standard for metadata  using Dublin Core elements . 3.2.5 – Configuration Options OPOW will provide a user interface to set configuration options that OPOW will  store and apply until changed by the user.  These options will be The location and name of the input file The location and name of the output file 3.2.6 – Program Execution  OPOW will execute as a stand­alone program that is started and  run as neede d  OPOW will be able to execute in silent mode.  That is, it can  complete execution with no interaction with a person during execution.  OPOW will be able to execute in an interactive mode.  In this  mode, the person interacting with OPOW will be able to edit the input file  and configuration options before the input file is processed 3.2.7 – Input File Editin g OPOW will provide a user interface for viewing and editing data in the input file.  OPOW will provide an interface for creating a new input fil e  OPOW will provide an interface to search and browse the data in  the input file.  OPOW will provide an interface to add and modify data in the  input file. 4


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