Workflow:PDF/A validation and metadata extraction
- UKWA search interface (create URL list of PDF/A files in UKWA) ->
- GNU_Wget (download files from IA, to create the test corpus) ->
- veraPDF (validates and extracts metadata from test corpus) ->
- XMLstarlet (process XML, extract useful fields into a CSV) ->
- Excel (view and analyse results in spreadsheet form)
The workflow begins with creation of a corpus of test files which is constructed using the UK Web Archive search interface (for example see this). The result is a list of URLs. These are fetched with Wget to create a large test corpus of predominantly PDF/A files. VeraPDF is then used to validate and extract metadata for each file. XMLstarlet is applied to extract fields of interest from the resulting XML creating a CSV. The CSV is then imported to Excel for analysis.
Purpose, context and content
This is a basic workflow for ad-hoc investigation of a set of PDF/A files. This is a very simple, manual, workflow that was used for testing purposes as part of the development of veraPDF, and is described further in this blog post: http://dpconline.org/blog/pdf-eh-redux-putting-verapdf-into-practice
The workflow was useful in that it helped to identify a number of bugs in veraPDF that have since been fixed. The workflow as is provides a very basic method of investigating PDF files, perhaps where some troubleshooting is required.