http://www.ncbi.nlm.nih.gov/entrez/linkout/doc/subjecttypes.html
Linkout Overview Pubmed Nucleotide Protein Genome Structure Popset Taxonomy OMIM Books Linkout Subjecttypes, Attributes and Urlname Last Updated: October 1, 2001 The"Subjecttype","Attribute"and"Urlname"elements specified in the Linkout DTD are_used to describe Linkout resources. Subjecttype values (listed and described below) will_be_used to display resources by subject, making it easier for Entrez users to browse the available Linkout resources and to retrieve records containing links to specific resources. Additionally, Entrez users will_be better able to find and select relevant Linkout resources in Entrez's Cubby system, which will allow users to choose which links will_be_displayed in the Entrez records they retrieve. For each Linkout resource, the provider should select the Subjecttype value from the list of specific Subject Types that best describes that resource and include it in the appropriate Linkout files. The General category Subject Types such_as, Education, Medical, etc. cannot be_used . If there_is no Subjecttype specified, the resource will_be_displayed in the"Other"category. The Attribute element is_used to_further describe some important aspects of Linkout resources. Attribute values will_be_used to organize resources, and to indicate to users which resources are subject_to particular conditions or limitations (e_g, . resources that require a membership or subscription). For each resource, the provider should select all Attribute values from the list below that apply, and include them in the appropriate Linkout files. A provider may supply a short text string in the Urlname element to describe its resource. Urlname is_used typically when the allowed Subjecttypes and Attributes cannot meet the need of a provider. For more information on the use of the Subjecttype, Attribute and Urlname elements, see the Linkout overview documents. Subjecttype categories Education Funding Sources Literature Medical Molecular_biology Databases Research Materials Researchers Tools Attribute categories Barriers Ownership Publications Subjecttypes Education: These Subjecttype values describe links from Entrez records to resources offering educational content, as_well_as those providing information about educational opportunities. conferences/meetings/workshops: Resources offering announcements of, or information on upcoming scientific conferences, meetings and workshops relevant to the subjects of specific Entrez records. glossaries/dictionaries: Resources offering glossaries or dictionaries of technical terminology or other specialized vocabularies used in research relevant to specific Entrez records. online tutorials/courses: Resources offering information about or providing Web-based primers, tutorials or courses on specialized areas of research relevant to specific Entrez records. Funding Sources: funding Sources: Resources providing information on locating, applying for or obtaining funding for particular areas of research relevant to the subjects of specific Entrez records. Literature: These Subjecttype values describe links to online bibliographic resources from Entrez records (typically Pubmed records. abstracts/indexes/summaries: Resources offering abstracts or summaries of publications cited in Entrez records, or indexes of publications relevant to particular Entrez records. aggregators: Services that provide a single point of online access to multiple full-text publications cited in Entrez records.""aggregators"are_differentiated from"publishers/providers"(see below) by their aggregation of online access to the publications of multiple publishers and/or providers. See Linkout and Publisher Holdings for details on Linkout and publishers. Services that allow users to_order for delivery copies of publications that are_cited in Entrez databases. books: Resources providing information about books directly relevant to specific Entrez records. individual online article: Links from Entrez records to individual online copies of the publications that they reference (i_e.,a link from a Pubmed record to a copy of a research article that the author has_made available on her/his personal Web_site. images: Links to online images from the Entrez records that they are relevant to or referenced by. libraries: Links to libraries or online library catalogs. Also, collections of links to online resources provided by libraries for their users. See Linkout and Library Holdings for details on Linkout and library holdings. patent databases: Links to patent database records from Pubmed citations of publications discussing patented products (including proteins and DNA sequences) or processes, or from relevant Entrez records. publishers/providers: Links to online publications offered by publishers or other providers that submit their Pubmed citation and abstract data electronically. See Linkout and Publisher Holdings for details on Linkout and publishers. Medical: These Subjecttype values describe links from Entrez records to relevant online medical resources. clinical trials: Links from Entrez records to resources providing information about relevant ongoing and upcoming clinical trials, including information on locating, applying to, or participating in clinical trials. consumer health: Links from Entrez records to relevant resources or materials intended to educate or inform the general public about particular health topics or issues. diagnostics: Resources providing information on the signs, symptoms and diagnosis of diseases, syndromes or conditions relevant to specific Entrez records. disease organizations: Institutions, groups or other organizations whose work is_focused on the research of particular diseases or conditions, or that offer information, support, and/or other resources to people suffering from particular diseases or conditions, linked from relevant Entrez records. Medical equipment and devices: Organizations or companies providing medical equipment or other medical devices relevant to specific Entrez records. pharmacology: Resources providing information on the pharmacological aspects of substances relevant to specific Entrez records. treatment guidelines: Resources offering treatment guidelines or information on treatment guidelines for particular diseases, syndromes or conditions relevant to specific Entrez records. Molecular_biology databases: These Subjecttype values describe links from Entrez records to corresponding or related records in other online molecular_biology databases. DNA/protein sequence: Databases providing nucleotide or amino_acid sequence data. gene/protein/disease-specific: Databases providing data specific to particular genes, proteins, diseases, syndromes or conditions. gene expression: Databases providing data on gene expression (e_g.,RNA transcription, knockouts. mapping: Databases providing chromosomal mapping data, such_as sequence tagged site (STS) mapping. organism-specific: Databases providing data specific to a particular organism or group of organisms. population/variation: Databases providing data on sequence variation within particular populations, including mutations or other polymorphisms. structure: Databases providing structural or pattern data, such 3-dimensional protein structures, chemical structures or 2 dimensional electrophoresis patterns. taxonomy/phyogenetic: Databases providing data on organism taxonomy, phylogenetic trees and relationships, or biodiversity. Research materials: These Subjecttype values describe links to relevant research material suppliers from Entrez records that discuss the use of these materials. clones/clone libraries: Suppliers providing DNA clones and clone libraries (e_g.,DNA, cdna. culture/stock collections: Suppliers providing cell cultures. laboratory equipment: Suppliers providing laboratory equipment. oligonucleotides: Suppliers providing equipment, materials and reagents used in researching oligonucleotides. other reagents: Suppliers providing other reagents not described by the Subjecttype values above. Researchers: These Subjecttype values describe links from Entrez records to the individuals or organizations that conducted or supported the research cited therein. colleges/universities: Colleges, universities or other academic institutions that have_conducted or supported research cited in Entrez records. companies/research institutes: Private companies or research institutions that have_conducted or supported research cited in Entrez records. directories: Links to the directory entries of individuals or organizations from Entrez records that cite research conducted or supported by those individuals or organizations. individuals: The web_pages of individuals who have_conducted research cited in Entrez records. societies/associations: Societies or organizations that have_conducted or supported research cited in Entrez records. Tools: These Subjecttype values describe links to research tools, utilities or other software from Entrez records citing research that discusses or requires the use of these tools. 3d structure prediction/functional modeling: Tools used in predicting the 3 dimensional structure of proteins, or in modeling protein function. primer design: Tools used in the design of nucleotide primer sequences for use in polymerase chain_reactions. protein identification/characterization: Tools used in the identification, annotation, characterization or other description of proteins. restriction mapping: Tools used in the mapping of restriction enzyme cutting sites. sequence screening/similarity/alignment: Tools used in screening, comparing, matching and alignment of sequences. sequence viewer: Tools used in creating visual representations of nucleotide or amino_acid sequences. translation: Tools used in the translation of sequences or of sequence file formats. Attributes Barriers: These Attribute values describe barriers to accessing the information being_linked to from an Entrez record. registration required: A free registration is_required in_order_to obtain access to the information being_linked. If any expense is_involved, please use the subscription/membership/fee required Attribute value. subscription/membership/fee required: Membership in an organization, a subscription, or some_other fee or expense is_required to obtain access to the information being_linked. Ownership: These Attribute values describe the ownership of the information that_is being_linked (if any) by the individual or organization providing the link. author of URL: The individual or organization providing a link is the author of the information that_is being_linked. publisher of information in URL: The individual or organization providing a link is the publisher of the information that_is being_linked. Publications: These Attribute values describe the form of the documents being_linked from Entrez records. document delivery: Organizations or services that will deliver copies of documents cited in Entrez records. full-text first published: The first version available of full-text documents. full-text online: Full-text documents that are in text, HTML, word_processor or other formats (besides PDF or Postscript. full-text PDF: Full-text documents that are in Adobe Portable Document Format (PDF. full-text Postscript: Full-text documents that are in Postscript format. library-local: Full-text documents hosted in a library. summary: Any summaries of documents cited in Entrez records. Questions regarding Linkout Subjecttypes and Attributes may_be_sent to linkout@ncbi. nlm. nih.