If you have acquired a new title for 2012, please notify CrossRef Support (support@crossref.org) of the transfer in advance to ensure a smooth transition. Title transfer procedures are available in our help documentation. 

Note that DOIs already assigned by any previous title owner must be maintained, and new DOIs should not be created for existing content. DOIs for titles are available through the depositor reports. We are also able to provide DOIs and metadata for acquired titles upon request.

Recent cited-by linking query results may not be accurate.  If you have submitted XML  batch cited-by queries recently, the query response has been returning an empty result instead of matches, for example:

 <forward_link doi="10.1053/sonc.2002.35642"> </forward_link>  

This problem has been fixed but we recommend any cited-by batch queries submitted within the past 4 days be resubmitted.

UNIXREF query results do not currently include a namespace. We're going to start including it as of October 7 (example below). This should not be an issue for most systems. If you do anticipate problems, please comment or contact me directly at pfeeney@crossref.org.

<?xml version="1.0" encoding="UTF-8"?>
<doi_records xmlns="http://www.crossref.org/xschema/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.crossref.org/xschema/1.0 http://www.crossref.org/schema/unixref1.0.xsd">
... 

As announced, schema verions prior to 4.3.0 have been discontinued. Deposits with previous versions of the schema (4.1.0, 3.0.3, etc.) are currently failing.

Migrating to 4.3.0 for journal deposits requires only changing the version number in the schema declaration.  Book and conference proceedings deposits require more complex changes. Review the help topic on schema for more information.

Please contact support@crossref.org or comment with any questions.