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Xinjiang Petroleum Geology (XPG) guarantees that all published material will be available for perpetuity. XPG is a subscriber member to the Portico-ARCHIVING SERVICE DETAILS REQUIRED-Portico digital preservation service provided by Portico, a not-for-profit organization with a mission to help the academic community use digital technologies to preserve the scholarly record and to advance research and teaching in sustainable ways.

Portico-ARCHIVING SERVICE DETAILS REQUIRED-Portico acts as an independent back up repository for publishers online content. Membership of Portico-ARCHIVING SERVICE DETAILS REQUIRED-Portico demonstrates a publisher¡¯s commitment to ensuring that valuable material they have published will always be available independent of the publishers own existence.

What Portico-ARCHIVING SERVICE DETAILS REQUIRED-Portico does:

 Portico provides access to its library participants when specific conditions or ¡°trigger events¡± occur, which may cause journal titles to no longer be available from the publisher or any other source such as:
  • When a publisher ceases operations and titles are no longer available from any other source
  • When a publisher ceases to publish and offer a title, and it is not offered by another publisher or entity
  • When back issues are removed from a publisher¡¯s offering and are not available elsewhere
  • Upon catastrophic failure by a publisher¡¯s delivery platform for a sustained period of time

When e-journal titles have ¡°triggered,¡± they are available to all participants in the Portico-ARCHIVING SERVICE DETAILS REQUIRED-Portico E-Journal Preservation Service, regardless of whether the participating institution has previously licensed the content.