Previous versions of Thema are still available 1.3 1.2 1.1 1.0.
Browse the Thema subject categories hierarchy, or search for a specific term within the hierarchy.
| Notation | Category heading | Add | Mod | ? |
|---|---|---|---|---|
| 3 | Time period qualifiers Use TIME PERIOD 3* Qualifier codes WITH appropriate subject codes for: indicating the time period range of a works content, such as the period covered by an art book (A*), a history book (N*), a memoir or biography (DN*), historical fiction (FV*), a children’s history book (YNH*), etc. National extensions (i.e. 3*-xx- format codes, where ‘xx’ indicates a country code) are for specific named periods of time that are important in particular markets but do not necessarily fit neatly into the structure of the general TIME PERIOD qualifiers. All national extensions are sub-categories of a core time period code, so can be mapped back to a standard period. National extensions can be assigned by any user, and are not exclusive to users in the indicated country. TIME PERIOD qualifiers are usually used in conjunction with PLACE 1* qualifiers. (Specific historical events or individual years would be conveyed in detail elsewhere in a products metadata, for example by the title, the table of contents, the descriptive text or keywords). DO NOT USE: for indicating the year of an annual or road atlas or travel guide or the year a work was originally published in, (this is described in other metadata). DO NOT USE: code “3” itself, but select appropriate specific qualifiers from section 3* |
1.4 | ✽ | |
| 3M | c 1500 onwards to present day | |||
| 3MP | 20th century, c 1900 to c 1999 | |||
| 3MPB | Early 20th century c 1900 to c 1950 | |||
| 3MPBA | c 1900 to c 1909 | |||
| 3MPBF | c 1910 to c 1919 | |||
| 3MPBG | c 1919 to c 1939 (Inter-war period) | 1.4 | ||
| 3MPBL | c 1940 to c 1949 | |||
| 3MPB-AR-B | 1916–1930 (period of the Saenz Peña Law and First democratic governments in Argentina) | 1.3.2 | 1.4 | |
| 3MPB-ES-A | c 1900 to c 1931 (period of the end of Spanish Monarchy) | 1.2.5 | 1.4 | |
| 3MPB-FI-A | 1899–1917 (period of Russification of Finland) | 1.3.2 | 1.4 | |
| 3MPB-IT-R | 1900–1914 (Italian Giolittian period) | 1.4 | ||
| 3MPB-JP-B | 1912–1926 (Japanese Taisho period) | 1.3.3 | ||
| 3MPB-JP-D | 1926–1945 (Japanese pre-war Showa period) | 1.3.3 | ||
| 3MPB-US-H | c 1890 to c 1929 (Progressive Era in the USA) | 1.4 |
version detail
- An ellipsis indicates a category has more detailed subcategories
- Click on a category description to reveal these ‘descendant’ subcategories
- Indentation indicates the ancestors and descendants of a category
- Click on the ✽ or ? to see or hide the usage notes
- Search for categories (for example ‘celebrity’) using the search field at the top
- Searches are not case-sensitive, and search both the category headings and any notes
- You don’t need to use complete words (eg ‘celeb’)
- You can also search for Thema codes – these searches must be exact (eg ‘MFGV’)
- Click on a search result category to see it ‘in context’ with its ancestor and descendant categories
- A click on ‘Category heading’ or a blank search returns you to the top level of the hierarchy
- Click on the notation to copy the code to the clipboard