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Instructions for updating strategies used in searching thematic areas of the VHL In view of the annual update carried out in the MeSH vocabulary which is then incorporated into DeCS, as well as changes in other DeCS categories, the need for the revision and update of the search strategies of the thematic areas of the VHL have become crucial. This revision applies both to the strategies that use descriptors as well as to those using hierarchic codes. To achieve the update of the strategies, the addresses for the two versions of DeCS are available, where consultations using the alphabetical, hierarchic and kwic (keyword in context) indices can be made: - version 2010 from which the strategies were based: DeCS 2010 Search - version 2011 from which the strategies must now be based: DeCS 2011 Search Besides the information available under "DeCS news" regarding the changes occurred in 2011 (DeCS 2011 edition), the link under DeCS previous editions, for the DeCS 2006 edition, contains more detailed information with respect to the important revision of the Public Health category concluded that year, of the descriptors that were modified and eliminated, as well as information of previous DeCS editions. In order to update search strategies containing hierarchic codes (or tree numbers), see changes taken place between the years 2010 and 2011 in the following tables: MeSH Tree number changes - 2011 MeSH Changes in 2011 DeCS hierarchical codes
Methodology for updating search strategies In the DeCS 2011 Search, look for the descriptor in the existing strategy using the "exact descriptor" field, or search the hierarchical code in the existing strategy using the tree index to see if it still exists. - If it exists, fine; - If the descriptor is not found, check in the list of changed descriptors and in the list of deleted descriptors on the DeCS 2011 edition news page and update its strategy with the descriptor that replaced (or absorbed) it; - If the hierarchical code is not found, search for it in the tree index of the DeCS 2010 Search and discover the descriptor to which this hierarchical code belongs and then search for this descriptor using the option "exact term" in the DeCS 2011 Search, to find out if it still exists and, if so, what is its valid hierarchical code. PAREI AQUI A REVISÃO DO INGLÊS DO QUE FOI ACRESCENTADO. - Example for a DeCS descriptor: the descriptor Organic Agriculture, until 2010 only existent in the SP4 subcategory, was included in MeSH's J category, "Technology, Industry, Agriculture". Thus, in 2011, its hierarchical codes are J01.040.895 This update should happen in all strategies where your hierarchical code is used. - Example for a MeSH descriptor: in 2011 the scope for Iron Compounds, which in MeSH 2010 was considered only inorganic, was expanded to also be included among the organic compounds. It therefore started to occur in a second position in the hierarchical structure (under Organometallic Compounds) in the Inorganic Compounds subcategory and in a third position in the Organic Compounds subcategory (also under a second occurence of Organometallic Compounds). So, note its hierarchical structures in these two versions: DeCS 2010 CHEMICALS AND DRUGS
[D] Organic
Compounds [D02] DeCS 2011 CHEMICALS AND DRUGS
[D] Inorganic
Compounds [D01] Organic
Compounds [D02] See below an example of a strategy for Pesticides, valid until 2004 and its updated strategy for 2006: Before updating: (ex SP4.405.350.364$ or ex SP8.473.654.412.052.080.115.020.020$ or ex D05.723$ or ex D27.720.723$) or (ti Pesticide$ or ti Plaguicida$ or ti Praguicida$) [Subject descriptor] Updating that was made: SP4.405.350.364 This hierarchic code which in 2004 corresponded to the Pesticides descriptor in SP4 (Environmental Health) was modified. The new 2006 hierarchic code for the descriptor in the SP4 (Environmental Health) category is: SP4.001.022.238. Explode, truncation The "ex" (from explode) that precedes the hierarchic code and the “$" sign (truncation), indicate that the Pesticides descriptor and all its more specific descriptors will be included in the recovery of literature. SP8.473.654.412.052.080.115.020.020 This hierarchic code, that continues to exist, also belongs to the Pesticides descriptor since, being DeCS polyhierarchical, a descriptor can be located in more than one of its categories/subcategories. It is not necessary to again include in the strategy this descriptor or the other hierarchic branch where the descriptor is found, because it is already also duly contemplated in SP4.001.022.238. Unnecessary truncation Another detail for the elaboration of the strategies is that when a hierarchic code of a descriptor is used under which there is no other more specific descriptor, it is unnecessary to follow it with the “$” sign D05.723 This hierarchic code does no longer appear in version 2004 of DeCS, since the D05 subcategory of MeSH was eliminated in 2004. Its content was transferred to the D27.888 subcategory. In 2005 the D05 subcategory was recreated by MeSH but with other content: Macromolecular Substances. Title words The words of the title continue in the search strategy expression without alterations. Pesticides [D27.720.723] and Pesticides [D27.888.723] These hierarchic branches are almost identical, except for the descriptor Pesticide Residues, present in the D27.888.723 branch and absent in the D27.720.723 branch One should remember that the same descriptor can be inserted in different hierarchies in the DeCS tree, with variations in the specific descriptors. If it is necessary to consider different specific descriptors, the different hierarchic branches can be included in the strategy Final recommendation Thus, contemplating all the existing specific descriptors in the various hierarchic branches where the descriptor Pesticides is inserted, the new search strategy must be as follows: (ex SP4.001.022.238$ or ex D27.888.723$) [Subject descriptor] or (ti Pesticide$ or ti Plaguicida$ or ti Praguicida$) [Title words] Annex: Cited hierarchic branches in the example in the two versions of DeCS: DeCS 2004: Pesticides [D27.720.723] Pesticides [D27.888.723] Pesticides [SP4.405.350.364] Pesticides [SP8.473.654.412.052.080.115.020.020] DeCS
2006: Pesticides [D27.720.723] Pesticides [D27.888.723] Pesticides [SP4.001.022.238] Pesticides [SP8.473.654.412.052.080.115.020.020]
Last updated in: January 17, 2011
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