Sociolinguistics and its closely related neighbors, ethnolinguistics and anthropological linguistics, are often studied in the context of specific languages. (“Sociolinguistics” will be used throughout to represent any and/or all of sociolinguistics, ethnolinguistics, and anthropological linguistics.) Until recently, however, no provision was given in the DDC for expressing a specific language in the context of sociolinguistics et al. An expansion at 306.442 Anthropological linguistics, ethnolinguistics, sociolinguistics of a specific language now provides for notation from Table 6 Languages to be added to 306.442 to collocate language-specific sociolinguistics.
Consider, for example, Language ideologies and the globalization of standard Spanish (to which the LCSH Sociolinguistics has been assigned). With the expansion at 306.442, the number for this work becomes 306.44261 Sociolinguistics of Spanish (built with 306.442, plus notation T6—61 Spanish, as instructed at 306.442). (Because it wasn't possible previously to add Table 6 notation to 306.44 Language ["Class here sociolinguistics"], classifiers sometimes desperately and cleverly tried to fill the need by adding standard subdivision notation T1—09 Geographic treatment, plus notation T2—175 Regions where specific languages predominate, as instructed under T1—091 Areas, regions, places in general, plus the appropriate notation from Table 6, as instructed under T2—175. Such classification was an end run around a missing add instruction: geographic treatment in a region where a language predominates is not the same thing as the language itself.)
Sometimes classification of a sociolinguistics work wants to express both language and place. Because this happens fairly often, the add instruction under 306.442 provides for the classifier to use 0 as a facet indicator between the notation for language and Table 2 notation instead of using standard subdivision T1—09: "Add to base number 306.442 notation T6—2-9 from Table 6, e.g., sociolinguistics of French 306.44241; then add 0 and to the result add notation T2—1- 9 from Table 2, e.g., sociolinguistics of French in Quebec 306.442410714." This is the approach that we take with a work like Sociolinguistics and Nigerian English, which should now be classed in 306.442210669 Sociolinguistics of English in Nigeria (built with 306.442, plus notation T6—21 English, plus facet indicator 0, plus notation T2—669 Nigeria, all as instructed under 306.442).
A work on the sociolinguistics of a place, where the work is not language-specific, uses 306.44 Language plus standard subdivision T1—09 Geographic treatment plus Table 2 notation, as in the past. For example, The languages of urban Africa, to which the LCSH Sociolinguistics—Africa has been assigned,should continue to be classed in 306.44096091732 Sociolinguistics of African urban regions (built with 306.44, plus notation T1—09 Geographic treatment, plus notation T2—6 Africa, as instructed under T1—093-099 Specific continents, countries, localities, plus notation T1—093-099:091 Areas, regions, places in general from the add table under T1—093-099, plus notation T2—1732 Urban regions, as instructed under T1—093-099:091).