The document discusses website archivability and presents CLEAR, a method for evaluating the archivability of websites. CLEAR assesses website attributes like accessibility, cohesion, metadata, performance, and standards compliance to determine an overall archivability score. It was developed to help automate quality assurance for web archives by providing credible, live measurements of how completely and accurately a website can be archived. The authors also describe a demonstration of CLEAR called ArchiveReady.com and discuss the potential impact of evaluating website archivability for web professionals and archive operators.
Η εφαρμογή έχει σκοπό την αυτοματοποίηση της διακρίβωσης ογκομετρικών δοχείων και δεξαμενών. Χρησιμοποιώντας την εφαρμογή, ο χρήστης μπορεί να πραγματοποιήσει διακρίβωση (ογκομέτρηση) μιας δεξαμενής ακολουθώντας τα εξής απλά βήματα:
Εισαγωγή γενικών πληροφοριών που αφορούν τις εξής παραμέτρους: Πελάτης, Τεχνικός υπεύθυνος, Στοιχεία δεξαμενής, Στοιχεία Πρότυπου Ογκομετρικού Δοχείου, Περιβαλλοντικές Συνθήκες, κλπ.
Εισαγωγή Πρωτογενών Δεδομένων διακρίβωσης (ογκομέτρησης) μέσω ενός αρχείου Excel.
Μεθοδολογία.
Στατιστική επεξεργασία δεδομένων και επιλογή της βέλτιστης λύσης.
Εκτύπωση Πίνακα Βαθμονόμησης και εκτίμηση μετρητικής αβεβαιότητας σύμφωνα με της μεθοδολογία GUM (BIPM et al, Guide to the Expression of Uncertainty in Measurement (GUM), 2nd ed., International Organization for Standardization, Genève, 1995).
BlogForever Crawler: Techniques and algorithms to harvest modern weblogs Pres...Vangelis Banos
Blogs are a dynamic communication medium which has been
widely established on the web. The BlogForever project has
developed an innovative system to harvest, preserve, manage
and reuse blog content. This paper presents a key component
of the BlogForever platform, the web crawler. More
precisely, our work concentrates on techniques to automatically
extract content such as articles, authors, dates and
comments from blog posts. To achieve this goal, we introduce
a simple and robust algorithm to generate extraction
rules based on string matching using the blog’s web feed in
conjunction with blog hypertext. This approach leads to a
scalable blog data extraction process. Furthermore, we show
how we integrate a web browser into the web harvesting process
in order to support the data extraction from blogs with
JavaScript generated content.
CLEAR: a Credible Live Evaluation Method of Website Archivability, iPRES2013Vangelis Banos
This document presents CLEAR, a method for evaluating the archivability of websites. CLEAR assesses website attributes like accessibility, cohesion, metadata, performance, and standards compliance by performing evaluations of facets within each attribute. It generates an archivability score on a scale of 0-100% for each facet and attribute, and an overall score for the website. The document demonstrates CLEAR's implementation in a web application called ArchiveReady.com and discusses its potential benefits for web archivists and professionals to improve web archiving practices and preserve websites effectively. It also outlines some limitations and directions for future work, such as differentially weighting facet evaluations.
Website Archivability - Library of Congress NDIIPP Presentation 2015/06/03Vangelis Banos
Website Archivability (WA) captures the core
aspects of a website crucial in diagnosing
whether it has the potentiality to be archived
with completeness and accuracy.
This document discusses website accessibility and provides guidelines for creating accessible websites. It defines accessibility as ensuring website content can be accessed by everyone regardless of disabilities or technologies used. It outlines various disabilities that can impact website access such as vision, hearing, mobility or cognitive impairments. It then discusses key accessibility standards and guidelines from W3C, Section 508, and ADA. Finally, it provides tips for making websites more accessible through proper use of text alternatives, captions, transcripts, headings, forms, tables and CSS formatting.
Η εφαρμογή έχει σκοπό την αυτοματοποίηση της διακρίβωσης ογκομετρικών δοχείων και δεξαμενών. Χρησιμοποιώντας την εφαρμογή, ο χρήστης μπορεί να πραγματοποιήσει διακρίβωση (ογκομέτρηση) μιας δεξαμενής ακολουθώντας τα εξής απλά βήματα:
Εισαγωγή γενικών πληροφοριών που αφορούν τις εξής παραμέτρους: Πελάτης, Τεχνικός υπεύθυνος, Στοιχεία δεξαμενής, Στοιχεία Πρότυπου Ογκομετρικού Δοχείου, Περιβαλλοντικές Συνθήκες, κλπ.
Εισαγωγή Πρωτογενών Δεδομένων διακρίβωσης (ογκομέτρησης) μέσω ενός αρχείου Excel.
Μεθοδολογία.
Στατιστική επεξεργασία δεδομένων και επιλογή της βέλτιστης λύσης.
Εκτύπωση Πίνακα Βαθμονόμησης και εκτίμηση μετρητικής αβεβαιότητας σύμφωνα με της μεθοδολογία GUM (BIPM et al, Guide to the Expression of Uncertainty in Measurement (GUM), 2nd ed., International Organization for Standardization, Genève, 1995).
BlogForever Crawler: Techniques and algorithms to harvest modern weblogs Pres...Vangelis Banos
Blogs are a dynamic communication medium which has been
widely established on the web. The BlogForever project has
developed an innovative system to harvest, preserve, manage
and reuse blog content. This paper presents a key component
of the BlogForever platform, the web crawler. More
precisely, our work concentrates on techniques to automatically
extract content such as articles, authors, dates and
comments from blog posts. To achieve this goal, we introduce
a simple and robust algorithm to generate extraction
rules based on string matching using the blog’s web feed in
conjunction with blog hypertext. This approach leads to a
scalable blog data extraction process. Furthermore, we show
how we integrate a web browser into the web harvesting process
in order to support the data extraction from blogs with
JavaScript generated content.
CLEAR: a Credible Live Evaluation Method of Website Archivability, iPRES2013Vangelis Banos
This document presents CLEAR, a method for evaluating the archivability of websites. CLEAR assesses website attributes like accessibility, cohesion, metadata, performance, and standards compliance by performing evaluations of facets within each attribute. It generates an archivability score on a scale of 0-100% for each facet and attribute, and an overall score for the website. The document demonstrates CLEAR's implementation in a web application called ArchiveReady.com and discusses its potential benefits for web archivists and professionals to improve web archiving practices and preserve websites effectively. It also outlines some limitations and directions for future work, such as differentially weighting facet evaluations.
Website Archivability - Library of Congress NDIIPP Presentation 2015/06/03Vangelis Banos
Website Archivability (WA) captures the core
aspects of a website crucial in diagnosing
whether it has the potentiality to be archived
with completeness and accuracy.
This document discusses website accessibility and provides guidelines for creating accessible websites. It defines accessibility as ensuring website content can be accessed by everyone regardless of disabilities or technologies used. It outlines various disabilities that can impact website access such as vision, hearing, mobility or cognitive impairments. It then discusses key accessibility standards and guidelines from W3C, Section 508, and ADA. Finally, it provides tips for making websites more accessible through proper use of text alternatives, captions, transcripts, headings, forms, tables and CSS formatting.
Ensuring your site is usable by any user, anywhere in the world, on their device, with their network speed by focusing on uptime, speed and performance, critical content, accessibility, and usability.
This document provides an overview of a major seminar on knowledge discovery from web logs. It discusses how analyzing vast amounts of web site traversal data stored in web logs can reveal useful knowledge about user behavior that can be applied to improve web service performance. Specific techniques covered include mining web logs to build path profiles that predict future page visits, using these predictions to prefetch web documents for faster loading, and clustering web pages to create more intuitive user interfaces. The document lists several applications of web log mining and its advantages.
This is usually a memorandum of understanding between the repository management team and the institutions
research office which is used by library top management to assess the quality of the repository and whether the
repository is meeting the institutions business or academic objectives.
Case Study For Service Providers Analysis PlatformMike Taylor
Service Providers Analysis Platform. Platform for Comprehensive Vendor Research & Analysis provide the buyer a comprehensive vendor research market leading database of companies and references.
This document discusses building a software tool to archive websites using web crawling and blockchain technology. It proposes a system that crawls websites, stores web page content and metadata in WARC files, and records this information in a blockchain database with two layers - a domain blockchain to store domain information and a web content blockchain to store WARC files. This approach aims to provide a consistent and secure system for archiving websites while allowing users to monitor and analyze archived web content. The document reviews related work on web archiving and outlines the proposed system architecture and implementation requirements.
Human Scale Web Collecting for Individuals and Institutions (Webrecorder Work...Anna Perricci
This is the main slide deck for a workshop at iPRES 2018 on human scale web collecting. A primary focus of the presentation was the use of Webrecorder.io, a free, open source web archiving tool available to all.
Accessibility is a hot issue that is unavoidable in the web industry. The deadline to ensure that web content meets all accessibility standards has come and gone. Whether you're a designer, developer, content owner or project manager, this presentation will cover strategies to reach and maintain accessibility goals.
Presentation from 2018 OmniUpdate User Training Conference
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The holiday rush of mobile and web traffic to your web site has the potential for unprecedented success or spectacular public failure. The world’s leading retailers have turned to the cloud to assure that no matter what load, mobile and web apps will delight customers and protect revenue.
Join us as Cliff explores the key criteria for holiday web performance readiness:
Closing the gap in front- and back-end web performance and reliability
Collecting real user data to define the most realistic test scenarios
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Leveraging CloudTest technology, as have 6 of 10 leading retailers
Research study on content management systems (CMS): issues with the conventio...IRJET Journal
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3 (de 3). Evaluación de Accessibilidad DigitalDCU_MPIUA
The document provides an overview of easy checks that can be performed as part of an initial evaluation of a website's accessibility. It discusses evaluating key aspects such as page titles, image text alternatives, headings, text color contrast, ability to resize text, keyboard navigation, and forms. Performing these basic checks helps identify potential issues in meeting accessibility guidelines and standards. The checks are designed to be quick to perform and can help prioritize more in-depth evaluation of areas needing improvement.
This document outlines Bluebonnet Solutions' 7-section website assessment methodology. It evaluates websites across key categories like responsive design, browser compatibility, coding errors, page speed, SEO, and database optimization. Each section is scored on criteria derived from Google's guidelines to analyze how well a site meets industry best practices for user experience, search visibility, and technical performance across different devices.
TCEA Virtual Learning SIG Lunch and Learn: Understanding Digital AccessibilityRaymond Rose
This document contains a presentation on understanding digital accessibility. It discusses what ADA, Section 504, and WCAG are and provides information on voluntary product accessibility templates and the roles of accessibility coordinators. Common findings from the Office of Civil Rights are outlined. The presentation emphasizes making accessibility the default and provides resources on evaluation tools, standards, and readings on relevant cases and agreements. The attendee is assigned homework on identifying coordinators and grievance procedures and using the WAVE tool to evaluate a page.
Automated Inference of Access Control Policies for Web ApplicationsLionel Briand
This document proposes an approach to automatically infer access control policies for web applications through dynamic analysis and machine learning. The approach involves exploring the application to discover resources, analyzing resource access data, inferring access rules using decision trees, assessing rule consistency, and targeted testing. An evaluation on two applications found the approach was effective in discovering resources and inferring correct policies for one application. Inconsistencies in the inferred rules also helped detect some access control issues in the applications.
IJERD (www.ijerd.com) International Journal of Engineering Research and Devel...IJERD Editor
The document proposes a framework for improving browser performance using fuzzy logic. It splits the browser cache into an instant cache and durable cache. Web objects are initially stored in the instant cache, and objects visited more than a threshold are moved to the durable cache. When the durable cache is full, a fuzzy system classifies each object as cacheable or uncacheable. Uncacheable objects are removed to make space for new objects. The fuzzy system considers factors like recency, frequency and size to determine cacheability. Experimental results showed this approach improved hit ratio and byte hit ratio compared to LRU and LFU caching policies.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, tools, hardware and software specifications, information architecture, site design, and application layer specifications for the project. The target user is between 10-70 years old and a novice web user. The site will be developed using current web technologies and a MySQL database. It will have simple navigation focused on key content areas and be accessible across different browsers and connections.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, and tools to be used. The site will use a content management system to allow staff to easily edit and upload content. It will have a simple navigation structure and meet technical requirements for speed and compatibility. Detailed specifications are provided for the hardware, information architecture, site design, application layers, and use cases.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, tools, hardware and software specifications, information architecture, site design, and application layer specifications for the project. The target user is between 10-70 years old and a novice web user. The site will be developed using current web technologies and a MySQL database. It will have simple navigation and emphasize updated content to educate visitors about pollution issues in India.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, tools, hardware and software specifications, information architecture, site design, and application layer specifications for the project. The target user is between 10-70 years old and a novice web user. The site will be developed using current web technologies and a MySQL database. It will have simple navigation and emphasize updated content to educate visitors about pollution issues in India.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, and tools to be used. The site will use a content management system to allow staff to easily edit and upload content. It will have a simple navigation structure and emphasize updated content. Hardware requirements, information architecture, site design guidelines, and application layer specifications are also defined. Finally, use cases and workflow diagrams demonstrate how the different components and features will function.
Ensuring your site is usable by any user, anywhere in the world, on their device, with their network speed by focusing on uptime, speed and performance, critical content, accessibility, and usability.
This document provides an overview of a major seminar on knowledge discovery from web logs. It discusses how analyzing vast amounts of web site traversal data stored in web logs can reveal useful knowledge about user behavior that can be applied to improve web service performance. Specific techniques covered include mining web logs to build path profiles that predict future page visits, using these predictions to prefetch web documents for faster loading, and clustering web pages to create more intuitive user interfaces. The document lists several applications of web log mining and its advantages.
This is usually a memorandum of understanding between the repository management team and the institutions
research office which is used by library top management to assess the quality of the repository and whether the
repository is meeting the institutions business or academic objectives.
Case Study For Service Providers Analysis PlatformMike Taylor
Service Providers Analysis Platform. Platform for Comprehensive Vendor Research & Analysis provide the buyer a comprehensive vendor research market leading database of companies and references.
This document discusses building a software tool to archive websites using web crawling and blockchain technology. It proposes a system that crawls websites, stores web page content and metadata in WARC files, and records this information in a blockchain database with two layers - a domain blockchain to store domain information and a web content blockchain to store WARC files. This approach aims to provide a consistent and secure system for archiving websites while allowing users to monitor and analyze archived web content. The document reviews related work on web archiving and outlines the proposed system architecture and implementation requirements.
Human Scale Web Collecting for Individuals and Institutions (Webrecorder Work...Anna Perricci
This is the main slide deck for a workshop at iPRES 2018 on human scale web collecting. A primary focus of the presentation was the use of Webrecorder.io, a free, open source web archiving tool available to all.
Accessibility is a hot issue that is unavoidable in the web industry. The deadline to ensure that web content meets all accessibility standards has come and gone. Whether you're a designer, developer, content owner or project manager, this presentation will cover strategies to reach and maintain accessibility goals.
Presentation from 2018 OmniUpdate User Training Conference
Keys To World-Class Retail Web Performance - Expert tips for holiday web read...SOASTA
As Walmart.com’s former head of Performance and Reliability, Cliff Crocker knows large scale web performance. Now SOASTA’s VP of products, Cliff is pouring his passion and expertise into cloud testing to solve the biggest challenges in mobile and web performance.
The holiday rush of mobile and web traffic to your web site has the potential for unprecedented success or spectacular public failure. The world’s leading retailers have turned to the cloud to assure that no matter what load, mobile and web apps will delight customers and protect revenue.
Join us as Cliff explores the key criteria for holiday web performance readiness:
Closing the gap in front- and back-end web performance and reliability
Collecting real user data to define the most realistic test scenarios
Preparing properly for the virtual walls of traffic during peak events
Leveraging CloudTest technology, as have 6 of 10 leading retailers
Research study on content management systems (CMS): issues with the conventio...IRJET Journal
This document discusses research on content management systems (CMS) and their benefits for managing business websites. It examines challenges with traditional website management approaches that require technical expertise and are time-consuming. CMS platforms allow non-technical users to easily create and edit digital content through intuitive interfaces. They provide centralized content storage and streamlined collaboration. The study aims to understand business users' experiences with CMS and whether they agree on its benefits. It reviews prior literature on issues with conventional content management and how CMS addresses problems like content duplication and inconsistent designs.
3 (de 3). Evaluación de Accessibilidad DigitalDCU_MPIUA
The document provides an overview of easy checks that can be performed as part of an initial evaluation of a website's accessibility. It discusses evaluating key aspects such as page titles, image text alternatives, headings, text color contrast, ability to resize text, keyboard navigation, and forms. Performing these basic checks helps identify potential issues in meeting accessibility guidelines and standards. The checks are designed to be quick to perform and can help prioritize more in-depth evaluation of areas needing improvement.
This document outlines Bluebonnet Solutions' 7-section website assessment methodology. It evaluates websites across key categories like responsive design, browser compatibility, coding errors, page speed, SEO, and database optimization. Each section is scored on criteria derived from Google's guidelines to analyze how well a site meets industry best practices for user experience, search visibility, and technical performance across different devices.
TCEA Virtual Learning SIG Lunch and Learn: Understanding Digital AccessibilityRaymond Rose
This document contains a presentation on understanding digital accessibility. It discusses what ADA, Section 504, and WCAG are and provides information on voluntary product accessibility templates and the roles of accessibility coordinators. Common findings from the Office of Civil Rights are outlined. The presentation emphasizes making accessibility the default and provides resources on evaluation tools, standards, and readings on relevant cases and agreements. The attendee is assigned homework on identifying coordinators and grievance procedures and using the WAVE tool to evaluate a page.
Automated Inference of Access Control Policies for Web ApplicationsLionel Briand
This document proposes an approach to automatically infer access control policies for web applications through dynamic analysis and machine learning. The approach involves exploring the application to discover resources, analyzing resource access data, inferring access rules using decision trees, assessing rule consistency, and targeted testing. An evaluation on two applications found the approach was effective in discovering resources and inferring correct policies for one application. Inconsistencies in the inferred rules also helped detect some access control issues in the applications.
IJERD (www.ijerd.com) International Journal of Engineering Research and Devel...IJERD Editor
The document proposes a framework for improving browser performance using fuzzy logic. It splits the browser cache into an instant cache and durable cache. Web objects are initially stored in the instant cache, and objects visited more than a threshold are moved to the durable cache. When the durable cache is full, a fuzzy system classifies each object as cacheable or uncacheable. Uncacheable objects are removed to make space for new objects. The fuzzy system considers factors like recency, frequency and size to determine cacheability. Experimental results showed this approach improved hit ratio and byte hit ratio compared to LRU and LFU caching policies.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, tools, hardware and software specifications, information architecture, site design, and application layer specifications for the project. The target user is between 10-70 years old and a novice web user. The site will be developed using current web technologies and a MySQL database. It will have simple navigation focused on key content areas and be accessible across different browsers and connections.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, and tools to be used. The site will use a content management system to allow staff to easily edit and upload content. It will have a simple navigation structure and meet technical requirements for speed and compatibility. Detailed specifications are provided for the hardware, information architecture, site design, application layers, and use cases.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, tools, hardware and software specifications, information architecture, site design, and application layer specifications for the project. The target user is between 10-70 years old and a novice web user. The site will be developed using current web technologies and a MySQL database. It will have simple navigation and emphasize updated content to educate visitors about pollution issues in India.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, tools, hardware and software specifications, information architecture, site design, and application layer specifications for the project. The target user is between 10-70 years old and a novice web user. The site will be developed using current web technologies and a MySQL database. It will have simple navigation and emphasize updated content to educate visitors about pollution issues in India.
The document provides functional specifications and requirements for phases 2 through 4 of the Openhealth.in web site project. It outlines the goals, audience, phases, and tools to be used. The site will use a content management system to allow staff to easily edit and upload content. It will have a simple navigation structure and emphasize updated content. Hardware requirements, information architecture, site design guidelines, and application layer specifications are also defined. Finally, use cases and workflow diagrams demonstrate how the different components and features will function.
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1. The Theory and Practice
of Website Archivability
Vangelis Banos1, Yunhyong Kim2, Seamus Ross2, Yannis Manolopoulos1
1Department of Informatics, Aristotle University, Thessaloniki , Greece
2University of Glasgow, United Kingdom
FROM CLEAR TO ARCHIVEREADY.COM
2. 2
Table of Contents
1. Problem definition,
2. CLEAR: A Credible Live Method to
Evaluate Website Archivability,
3. Demo: http://archiveready.com/,
4. Future Work.
3. Problem definition
• Web content acquisition is a critical step in
the process of web archiving,
• Web bots face increasing difficulties in
harvesting websites,
• After web harvesting, archive administrators
review manually the content and endorse or
reject the harvested material,
• Key Problem: Web harvesting is automated
while Quality Assurance (QA) is manual.
3
4. Website
Archivability ?
What is
Website Archivability captures the core aspects
of a website crucial in diagnosing whether it has
the potentiality to be archived with
completeness and accuracy.
Attention! it must not be confused with website dependability,
reliability, availability, safety, security, survivability, maintainability.
5. CLEAR: A Credible Live Method to Evaluate
Website Archivability
• An approach to producing a credible on-the-fly
measurement of Website Archivability, by:
• Using standard HTTP to get website elements,
• Evaluating information such as file types, content
encoding and transfer errors,
• Combining this information with an evaluation of the
website's compliance with recognised practices in
digital curation,
• Using adopted standards, validating formats,
assigning metadata
• Calculating Website Archivability Score (0 – 100%)
5
8. 8
C L E A R
• The method can be summarised as follows:
1. Perform specific Evaluations on Website
Attributes,
2. In order to calculate each Archivability Facet’s
score,
• Scores range from (0 – 100%),
• Not all evaluations are equal, if an important
evaluation fails, score = 0, if a minor
evaluation fails, score = 50%
3. Producing the final Website Archivability as the
sum all Facets’ scores.
10. Accessibility evaluation
10
Facet Evaluation Rating Total
Accessibility
No RSS feed 50%
50%
No robots.txt 50%
No sitemap.xml 0%
6 links, all valid 100%
http://ipres2013.ist.utl.pt/ Website Archivability evaluation on 23rd April 2013
11. Cohesion
11
• Dependencies are a great issue in digital curation.
• If a website is dispersed across different web
locations (images, javascripts, CSS, CDNs, etc),
the acquisition and ingest is likely to risk suffering if
one or more web locations fail on change.
• Web bots may have issues accessing a lot of
different web locations due to configuration issues.
12. Cohesion evaluation
12
Facet Evaluation Rating Total
Cohesion
1 external and no internal scripts 0%
70%
4 local and 1 external images 80%
No proprietary (Quicktime & Flash)
files
100%
1 local CSS file 100%
http://ipres2013.ist.utl.pt/ Website Archivability evaluation on 23rd April 2013
13. Metadata
13
• Metadata are necessary for digital curation and
archiving.
• Lack of metadata impairs the ability to manage,
organise, retrieve and interact with content.
• Web content metadata may be:
• Syntactic: (e.g. content encoding, character set)
• Semantic: (e.g. description, keywords, dates)
• Pragmatic: (e.g. FOAF, RDF, Dublin Core)
14. Metadata evaluation
14
Facet Evaluation Rating Total
Metadata
Meta description found 100%
87%
HTTP Content type 100%
HTTP Page expiration not found 50%
HTTP Last-modified found 100%
http://ipres2013.ist.utl.pt/ Website Archivability evaluation on 23rd April 2013
15. Performance
15
• Calculate the average network response time for all
website content.
• The throughput of web spider data acquisition
affects the number and complexity of the web
sources it can process.
• Performance evaluation:
Facet Evaluation Rating Total
Performance Average network response
time is 0.546ms
100% 100%
http://ipres2013.ist.utl.pt/ Website Archivability evaluation on 23rd April 2013
16. Standards Compliance
16
• Digital curation best practices recommend that web
resources must be represented in known and
transparent standards, in order to be preserved.
17. Standards Compliance evaluation
17
Facet Evaluation Rating Total
Standards
Compliance
1 Invalid CSS file 0%
87%
Invalid HTML file 0%
Meta description found 100%
No HTTP Content encoding 50%
HTTP Content Type found 100%
HTTP Page expiration found 100%
HTTP Last-modified found 100%
No Quicktime or Flash objects 100%
5 images found and validated with JHOVE 100%
http://ipres2013.ist.utl.pt/ Website Archivability evaluation on 23rd April 2013
20. Impact
20
1. Web professionals
- evaluate the archivability of their websites
in an easy but thorough way,
- become aware of web preservation concepts,
- embrace preservation-friendly practices.
2. Web archive operators
- make informed decisions on archiving websites,
- perform large scale website evaluations with ease,
- automate web archiving Quality Assurance,
- minimise wasted resources on problematic websites.
21. 21
Future Work
1. Not optimal to treat all Archivability Facets as equal.
2. Evaluating a single website page, based on the
assumption that web pages from the same website
share the same components and standards.
Sampling would be necessary.
3. Certain classes and specific types of errors create
lesser or greater obstacles to website acquisition
and ingest than others. Differential valuing of error
classes and types is necessary.
4. Cross validation with web archive data is under way
22. THANK YOU
Vangelis Banos
Web: http://vbanos.gr/
Email: vbanos@gmail.com
ANY QUESTIONS?
22
The research leading to these results has
received funding from the European
Commission Framework Programme 7
(FP7), BlogForever project, grant
agreement No.269963.
Editor's Notes
Abstract: Web archiving is crucial to ensure that cultural, scientificand social heritage on the web remains accessible and usableover time. A key aspect of the web archiving process is opti-mal data extraction from target websites. This procedure isdifficult for such reasons as, website complexity, plethora ofunderlying technologies and ultimately the open-ended na-ture of the web. The purpose of this work is to establishthe notion of Website Archivability (WA) and to introducethe Credible Live Evaluation of Archive Readiness (CLEAR)method to measureWA for any website. Website Archivabil-ity captures the core aspects of a website crucial in diagnos-ing whether it has the potentiality to be archived with com-pleteness and accuracy. An appreciation of the archivabilityof a web site should provide archivists with a valuable toolwhen assessing the possibilities of archiving material and in-fluence web design professionals to consider the implicationsof their design decisions on the likelihood could be archived.A prototype application, archiveready.com, has been estab-lished to demonstrate the viabiity of the proposed methodfor assessing Website Archivability.
Web content acquisition is a critical step in the process of web archiving;If the initial Submission Information Package lacks completeness and accuracy for any reason (e.g. missing or invalid web content), the rest of the preservation processes are rendered useless;There is no guarantee that web bots dedicated to retrieving website content can access and retrieve it successfully;Web bots face increasing difficulties in harvesting websites.Efforts to deploy crowdsourced techniques to manage QA provide an indication of how significant the bottleneck is.Dirty data -> useless systemAs websites become more sophisticated and complex, the difficulties that web bots face in harvesting them increase.For instance, some web bots have limited abilities to process GIS les, dynamic web content, or streaming media [16]. Toovercome these obstacles, standards have been developed to make websites more amenable to harvesting by web bots.Two examples are the Sitemaps.xml and Robots.txt protocols. Such protocols are not used universally.
Website archivability must not be confused with website dependability, the former refers to the ability to archive a website while the latter is a system property that integrates such attributes as reliability, availability, safety, security, survivability and maintainability[1].Support web archivists in decision making, in order to improve the quality of web archives.Expand and optimize the knowledge and practices of web archivists.Standardize the web aggregation practices of web archives, especially QA.Foster good practices in web development, make sites more amenable to harvesting, ingesting, and preserving.Raise awareness among web professionals regarding preservation.
The concept of CLEAR emerged from our current research in web preservation in the context of the BlogForever project which involves weblog harvesting and archiving. Our work revealed the need for a method to assess website archive readiness in order to support web archiving workflows.
Already contacted by the following institutionsThe Internet Archive,University of Manchester,Columbia University Libraries,Society of California Archivists General Assembly,Old Dominion University, Virginia, USA,Digital Archivists in Netherlands.
For instance Metadata breadth and depth might be critical for a particular web archiving research task andtherefore in establishing the archivability score for a particular site the user may which to instantiate this thinking incalculating the overall score. A next step will be to introduce a mechanism to allow the user to weight each Archivability Facet to reflect specific objectives.One way to address these concerns might be to apply an ap-proach similar to normalized discounted cummulative gain(NDCG) in information retrieval49: for example, a user canrank the questions/errors to prioritise them for each facet.The basic archivability score can be adjusted to penalise theoutcome when the website does not meet the higher rankedcriteria. Further experimentation with the tool will lead toa richer understanding of new directions in automation inweb archiving.