From the schema
Top-level list of one or more IATI activity records.
|@version||A number indicating the IATI specification version in use.|
|@generated-datetime||A date/time stamp for when this file was generated. This is not necessarily the last-updated date for the individual activity records in it. Uses ISO 8601 date format, e.g. "2010-03-12T18:45:00+01:00". Use of this attribute is highly recommended, to allow recipients to know when a file has been updated.|
|@linked-data-default||IATI publishers are not obliged to publish their own Linked Data. However, if a publisher chooses to publish linked data about their IATI activities then allowing them to declare where this data is published would support discovery of it, and any additional information they may choose to publish as Linked Data alongside it. This attribute is URI path upon which an activity identifier can be appended to get a dereferenceable URI for any activity contained within a file. Where a publisher declares using one of these properties that authoritative linked data is accessible for an activity then consuming applications that are generating Linked Data from an IATI XML file should assert an owl:sameAs relationship to the relevant URI.|
Example that uses version 1.01, and was generated on 29th May 2012:
<iati-activities version="1.01" generated-datetime="2012-05-29T00:00:00"> .... </iati-activities>
Introduced the @linked-data-default attribute on iati-activities element