From the schema
Top-level element for a single IATI activity report.
|@version||A number indicating the IATI specification version in use. Defaults to "1.0" if not specified. It is required to specify this attribute if the document is using features specific to an IATI specification other than the initial 1.0 version.|
|@last-updated-datetime||The last date/time that the data for this specific activity was updated. This date must change whenever the value of any field changes.|
|@xml:lang||XML language attribute|
|@default-currency||Default ISO 4217 currency code for all financial values in this activity report. See http://iatistandard.org/101/codelists/currency|
|@hierarchy||Shortcut to show whether this is a parent or child activity, without having to evaluate related-activity elements.|
This example declares that the activity has a default language of English (en) and a default currency of US dollars. It was last updated on the 31st March 2012, and has a hierarchy value of 1.
<iati-activity xml:lang="en" default-currency="USD" last-updated-datetime="2012-03-31T01:01:01" hierarchy="1"> .... </iati-activity>