Copy of the Vision of Britain g_link table prior to 2016 rebuild.

Table ID:
G_LINK_2015     (58142)
Contents:
Copy of the Vision of Britain g_link table prior to 2016 rebuild.
Approx. number of rows:
52,309
Table type:
Raw Data
Documentation Author:
Humphrey Southall
Chronology:
The data cover the period 1881 to 1911.

Sources:

  1. The "links" table has been built up by the Great Britain Historical GIS Project over many years, so it needs to be treated as primary data.


Notes:

  1. The following values of g_authority appear, based on systematically harvesting place-specific web pages within these sites:
    • GENUKI_WEB (11,348 links): Genealogy UK and Ireland, a very large site created by a network of genealogists.
    • GeoNames (15,127 links): Global gazetteer.
    • Hist_WkHse (731 links): History of the Workhouse, created by Peter Higginbottom.
    • VCH_Web (7,012 links): Victoria County History at British History Online.
    • Wikipedia (18,091 links).
  2. The first version of the g_link table was a child table to our list of administrative units, but even the VCH was really more concerned with "places" so it is now a child table to g_place.


Checking:

  1. The table has been checked for internal consistency by setting up foreign key constraints to auo.g_authority and gbhdb.g_place_2015, but we cannot guarrantee that the external addresses work. As this table is intended as a permanent record of the pre-2016 system, over time more and more links will not work.


Indices:

IndexTypeColumn(s) indexed
g_link_2015_pkey Primary key g_place, g_url


Constraints:

The table has the following associated constraints:

ConstraintTypeDetails
g_link_2015_pkey Primary Key See details above for primary key index
g_link_ch_wk Check (((url_works)::text = 'N'::text) OR ((url_works)::text = 'Y'::text))



Columns within table:

ColumnTypeContents
g_authority Text string (max.len.=24). Identifier for the external site, as defined in our auo.g_authority table.
g_url Text string (max.len.=204). The URL of the page on the external site.
url_works Text string (max.len.=5). Flag column with values Y and N. It enables us to identify a particular external page as not working without actually removing it from our database. NB external sites, and especially GENUKI, sometimes change the format of their addresses, so they can be got working again by a global revision of the links we hold.
g_seq Integer number. Sequence number placing rows in order. This is particularly important where we have more than one link from one of our places to more than one page in a particular external site, which is common with our links to the Victoria County History.
g_url_label Text string (max.len.=124). Label to appear on the link when presented in the website. This will generally be the page title on the remote site, but given the kinds of page we link to this will often also be a place name.
g_place Integer number. ID number for the VoB place the link is for.
created_by Text string (max.len.=64). Name of the script which originally inserted current row into the table. This will generally also identify the source.