PubMed has changed tags for DOI numbers

Hi all!


It seems that PubMed has changed the tags for DOI from AID to LID for at least new references. This means that the current PubMed import filter is not correct. Old references still have the old AID tags. 

I’ve tried to make an updated PubMed filter that I have attached (that also remove the pii number that still is tagged with the same tag as the DOI number).

It seems to work, but if anyone care to test it I will be happy to learn about any errors.

PS! The  Connection File for those importing from Pubmed directly from EndNote also has to be updated for the new LID tag!


Best wishes


Jan Ove

Message Edited by parabuthus on 02-01-2010 09:17 AM
PubMed (NLM) DOI.enf (2.79 KB)

1 Like

I couldn’t find the LID tag in a pubmed record.  Do you mind giving a few PMIDs so I can test the new filter?



Here are three examples.


Best wishes


Jan Ove

PMID- 20075152
DA - 20100115
DCOM- 20100128
IS - 1468-5833 (Electronic)
IS - 1468-5833 (Linking)
VI - 340
DP - 2010
TI - Social variations in access to hospital care for patients with colorectal,
breast, and lung cancer between 1999 and 2006: retrospective analysis of hospital
episode statistics.
PG - b5479
LID - bmj.b5479 [pii]
LID - 10.1136/bmj.b5479 [doi]

PMID- 20068255
DA - 20100113
DCOM- 20100119
IS - 1468-5833 (Electronic)
IS - 1468-5833 (Linking)
VI - 340
DP - 2010
TI - Effectiveness of early physiotherapy to prevent lymphoedema after surgery for
breast cancer: randomised, single blinded, clinical trial.
PG - b5396
LID - bmj.b5396 [pii]
LID - 10.1136/bmj.b5396 [doi]

PMID- 20071419
DA - 20100114
DCOM- 20100128
IS - 1468-5833 (Electronic)
IS - 1468-5833 (Linking)
VI - 340
DP - 2010
TI - Preoperative MRI fails to reduce risk of incomplete tumour excision in small
breast cancers.
PG - c207
LID - 10.1136/bmj.c207 [doi]
LID - bmj.c207 [pii]

Message Edited by parabuthus on 02-01-2010 04:33 PM

Hi again!


I’m getting a little confused now. Checking the following new references (PMID):


 The AID tag is used. 


I wonder if the LID tag is used for online only references. Looking at the examples I’ve found they all seem to be without normal page number and PubMed display the DOI number in the Summary Display. This is not done for “normal” articles even though they have a DOI number if I check the Medline Display.


Anyway, the filter I have attached have retained instructions for the AID tag in addition to the new LID tag, so the filter should handle both types.


Does anyone know the reason for the LID tag (compared to the AID tag)?


Best wishes


Jan Ove

A quick check shows that BMJ seems to use the LID for the DOI field as far back as 2008 in my random check.  2007 are the last ones that come up in my search that have the DOI mapping correctly in a pubmed search with my current “connect” file. 

I don’t know how many other journals may have other similar idiosyncratic assignments? 

Thanks, Leanne!

I found another title (Drugs):

PMID- 20108993
STAT- In-Data-Review
DA - 20100129
IS - 0012-6667 (Print)
IS - 0012-6667 (Linking)
VI - 70
IP - 2
DP - 2010
TI - Trastuzumab: A Review of its Use as Adjuvant Treatment in Human Epidermal Growth
Factor Receptor 2 (HER2)-Positive Early Breast Cancer.
PG - 215-39
LID - 10.2165/11203700-000000000-00000 [doi]

What is interesting is that the references that uses the LID tag have the DOI number in the summary display (se below):

Trastuzumab: A Review of its Use as Adjuvant Treatment in Human Epidermal Growth Factor Receptor 2 (HER2)-Positive Early Breast Cancer.

Garnock-Jones KP, Keating GM, Scott LJ.

Drugs. 2010;70(2):215-39. doi: 10.2165/11203700-000000000-00000.PMID: 20108993 [PubMed - in process]

I will try to find more titles, but a new filter and connection file will probably be a good thing for those wanting all DOI’s.

Best wishes

Jan Ove

Here’s how NLM defines the difference between LID and AID:

I don’t know if this is helpful or not.

Thanks for the info!

Here is the definitions:

Location ID [LID]

The DOI or publisher ID that serves the role of pagination to locate an online article.

Article Identifier [AID]

Includes article identifiers submitted by journal publishers such as doi (digital object identifier). These data are typically used for generating LinkOut links.

It seems that the LID number is used when a online article lacks normal pagination (?). It seems that the use of this tag is controlled by the publishers when they submitt data to Pubmed.

I’ve found the LID tag is used also for some articles in Journal of Clinical Investigation and Pharmacoeconomics.

Anyway, it seems from this that it is neccessary to “program” the PubMed Connection filter and Import filter for the AID tag to be sure to get all DOI numbers.

I haven’t checked how the situation is for the different Medline filters - if there is two different tags used in the export files for these too.

Best wishes

Jan Ove

Well, here is my new PubMed Connect file. Please put it thru its paces and let me know if I missed anything?

PubMed (NLM)-AID-LID-no pii.enz (4.98 KB)

1 Like

Looking good, Leanne, but don’t you need to include:

LID -    {IGNORE} [pii]

to remove the pii number, which also uses the LID tag?


Jan Ove


PubMed(NLM)-AID-LID-no-pii[2].enz (5.01 KB)