Open Harvester Systems

The Open Harvester Systems is a free metadata indexing system developed by the Public Knowledge Project through its federally funded efforts to expand and improve access to research.

OHS allows you to create a searchable index of the metadata from Open Archives Initiative (OAI)-compliant archives, such as sites using Open Journal Systems (OJS) or Open Conference Systems (OCS).

OHS version 2.x includes the following features:

  • Ability to harvest OAI metadata in a variety of schemas (including unqualified DC, the PKP (Open Journal Systems/Open Conference Systems) Dublin Core extension, MODS, and MARCXML). Additional schema are supported via plugins.
  • Flexible search interface that allows simple searching and advanced searching using crosswalked fields from all harvested archives. Advanced searching of archives that share the same schema will be possible using fields as defined in the schema. When creating crosswalks for searching, admins can define elements are text, date, or HTML multiple select interface widgets.
  • Ability to perform granular harvesting using setSpec and timestamps.
  • Ability to perform post-harvest and pre-indexing filtering/normalization on metadata.
  • User Interface with CSS and template-based HTML for easy customization.
  • Searching is highly scalable (creates an inverted index for searching).

A discussion forum is also available.