This site contains downloaded content from the caDSR database. 

- CDEs are common data element metadata descriptions of data fields used in cancer research and other biomedical research. 
- CRFs are case report forms. At this time we have not posted any CRFs for download.
- Classifications are customer defined categories for organizing CDEs and other content into collections to make it easier to find the content they are using.

Please note the following: 

- Each zip file contains a complete dump of the most recent CDEs as of the date of the file. Old files will be archived for reference.
- We are currently keeping 30 days of files in the main folder that are generated nightly. 
- At the end of 30 days, the oldest file is moved to the ../XML_Archive directory.

-The filename of the zip files follows the format: 
	⁃	xml_cde_<timestamp>.zip 
    YYYY[M]M[D]D[H]H[m]m[s]s
 
and the M, D, H, m, and s can be one or two digits.

The files contained in the zip are named similarly to the zip, e.g xml_cde_<timestamp>_X.xml but with a sequential numeric X suffix indicating its order in the export sequence.  Each xml file has 5000 CDE elements and the size of the file adds up to 80-100 MB.  The XML schema for the caDSR XML export can be found in this directory.

Please note:  

- To get the most recent dump of caDSR CDEs select the file with the most recent date. The entire caDSR set of non-retired CDEs is exported to the FTP site nightly.
- There can be multiple versions of a CDE with the same Public ID if there are more than one version in a non-retired state.
- The Data Element modifiedDate indicates only if direct attribute of the data element was updated. An update to the DataElement includes if a different version of a Data Element Concept or Value Domain have been associated with the DataElement. This DataElement modifiedDate does not get updated if attributes of the Value Domain or permissible values are update. 
- Not all Permissible Value Meanings, Object Class, and Property items contain concept annotations.
- The Concept Display Order indicates its relative weight in the semantics of the item. The Primary Concept, Display Order = 0, is the primary meaning of the item. The other concepts are qualifiers/modifiers of the meaning, the higher the Display Orders modify the term with the lower DisplayOrder
- For enumerated Value Domains, there may be inconsistencies in the Value Domain attributes  and the values in the Permissible Values list, such as a maximum length that is less than some for the permissible values. 

- For additional information or feedback please contact NCIAppSupport@nih.gov.