docs: make customization chapter a separate section

docs/CMakeLists.txt

@@ -10,6 +10,7 @@ set (DOC_SOURCES
      admin
      develop
      api
+     customize
      index.md
      extra.css
      styles.css

docs/admin/Customization.md

@@ -1,101 +0,0 @@
-# Customization of the Database
-
-This section explains in detail how to configure a Nominatim import and
-the various means to use external data.
-
-## External postcode data
-
-Nominatim creates a table of known postcode centroids during import. This table
-is used for searches of postcodes and for adding postcodes to places where the
-OSM data does not provide one. These postcode centroids are mainly computed
-from the OSM data itself. In addition, Nominatim supports reading postcode
-information from an external CSV file, to supplement the postcodes that are
-missing in OSM.
-
-To enable external postcode support, simply put one CSV file per country into
-your project directory and name it `<CC>_postcodes.csv`. `<CC>` must be the
-two-letter country code for which to apply the file. The file may also be
-gzipped. Then it must be called `<CC>_postcodes.csv.gz`.
-
-The CSV file must use commas as a delimiter and have a header line. Nominatim
-expects three columns to be present: `postcode`, `lat` and `lon`. All other
-columns are ignored. `lon` and `lat` must describe the x and y coordinates of the
-postcode centroids in WGS84.
-
-The postcode files are loaded only when there is data for the given country
-in your database. For example, if there is a `us_postcodes.csv` file in your
-project directory but you import only an excerpt of Italy, then the US postcodes
-will simply be ignored.
-
-As a rule, the external postcode data should be put into the project directory
-**before** starting the initial import. Still, you can add, remove and update the
-external postcode data at any time. Simply
-run:
-
-```
-nominatim refresh --postcodes
-```
-
-to make the changes visible in your database. Be aware, however, that the changes
-only have an immediate effect on searches for postcodes. Postcodes that were
-added to places are only updated, when they are reindexed. That usually happens
-only during replication updates.
-
-## Installing Tiger housenumber data for the US
-
-Nominatim is able to use the official [TIGER](https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.html)
-address set to complement the OSM house number data in the US. You can add
-TIGER data to your own Nominatim instance by following these steps. The
-entire US adds about 10GB to your database.
-
-  1. Get preprocessed TIGER 2021 data:
-
-        cd $PROJECT_DIR
-        wget https://nominatim.org/data/tiger2021-nominatim-preprocessed.csv.tar.gz
-
-  2. Import the data into your Nominatim database:
-
-        nominatim add-data --tiger-data tiger2021-nominatim-preprocessed.csv.tar.gz
-
-  3. Enable use of the Tiger data in your `.env` by adding:
-
-        echo NOMINATIM_USE_US_TIGER_DATA=yes >> .env
-
-  4. Apply the new settings:
-
-        nominatim refresh --functions
-
-
-See the [developer's guide](../develop/data-sources.md#us-census-tiger) for more
-information on how the data got preprocessed.
-
-## Special phrases import
-
-As described in the [Importation chapter](Import.md), it is possible to
-import special phrases from the wiki with the following command:
-
-```sh
-nominatim special-phrases --import-from-wiki
-```
-
-But, it is also possible to import some phrases from a csv file. 
-To do so, you have access to the following command:
-
-```sh
-nominatim special-phrases --import-from-csv <csv file>
-```
-
-Note that the two previous import commands will update the phrases from your database.
-This means that if you import some phrases from a csv file, only the phrases
-present in the csv file will be kept into the database. All other phrases will
-be removed.
-
-If you want to only add new phrases and not update the other ones you can add
-the argument `--no-replace` to the import command. For example:
-
-```sh
-nominatim special-phrases --import-from-csv <csv file> --no-replace
-```
-
-This will add the phrases present in the csv file into the database without
-removing the other ones.

docs/customize/Overview.md

@@ -0,0 +1,16 @@
+Nominatim comes with a predefined set of configuration options that should
+work for most standard installations. If you have special requirements, there
+are many places where the configuration can be adapted. This chapter describes
+the following configurable parts:
+
+* [Global Settings](Settings.md) - detailed description of all parameters that
+  can be set in your local `.env` configuration
+* [Tokenizers](Tokenizers.md) - describe the configuration of the module
+  responsible for analysing and indexing names
+* [Special Phrases](Special-Phrases.md) are common nouns or phrases that
+  can be used in search to identify a class of places
+
+There are also guides for adding the following external data:
+
+* [US house numbers from the TIGER dataset](Tiger.md)
+* [External postcodes](Postcodes.md)

docs/customize/Postcodes.md

@@ -0,0 +1,37 @@
+# External postcode data
+
+Nominatim creates a table of known postcode centroids during import. This table
+is used for searches of postcodes and for adding postcodes to places where the
+OSM data does not provide one. These postcode centroids are mainly computed
+from the OSM data itself. In addition, Nominatim supports reading postcode
+information from an external CSV file, to supplement the postcodes that are
+missing in OSM.
+
+To enable external postcode support, simply put one CSV file per country into
+your project directory and name it `<CC>_postcodes.csv`. `<CC>` must be the
+two-letter country code for which to apply the file. The file may also be
+gzipped. Then it must be called `<CC>_postcodes.csv.gz`.
+
+The CSV file must use commas as a delimiter and have a header line. Nominatim
+expects three columns to be present: `postcode`, `lat` and `lon`. All other
+columns are ignored. `lon` and `lat` must describe the x and y coordinates of the
+postcode centroids in WGS84.
+
+The postcode files are loaded only when there is data for the given country
+in your database. For example, if there is a `us_postcodes.csv` file in your
+project directory but you import only an excerpt of Italy, then the US postcodes
+will simply be ignored.
+
+As a rule, the external postcode data should be put into the project directory
+**before** starting the initial import. Still, you can add, remove and update the
+external postcode data at any time. Simply
+run:
+
+```
+nominatim refresh --postcodes
+```
+
+to make the changes visible in your database. Be aware, however, that the changes
+only have an immediate effect on searches for postcodes. Postcodes that were
+added to places are only updated, when they are reindexed. That usually happens
+only during replication updates.

docs/customize/Settings.md

@@ -0,0 +1,27 @@
+This section provides a reference of all configuration parameters that can
+be used with Nominatim.
+
+# Configuring Nominatim
+
+Nominatim uses [dotenv](https://github.com/theskumar/python-dotenv) to manage
+its configuration settings. There are two means to set configuration
+variables: through an `.env` configuration file or through an environment
+variable.
+
+The `.env` configuration file needs to be placed into the
+[project directory](../admin/Import/#creating-the-project-directory). It
+must contain configuration parameters in `<parameter>=<value>` format.
+Please refer to the dotenv documentation for details.
+
+The configuration options may also be set in the form of shell environment
+variables. This is particularly useful, when you want to temporarily change
+a configuration option. For example, to force the replication serve to
+download the next change, you can temporarily disable the update interval:
+
+    NOMINATIM_REPLICATION_UPDATE_INTERVAL=0 nominatim replication --once
+
+If a configuration option is defined through .env file and environment
+variable, then the latter takes precedence. 
+
+# Configuration Parameter Reference
+

docs/customize/Special-Phrases.md

@@ -0,0 +1,34 @@
+# Special phrases
+
+## Importing OSM user-maintained special phrases
+
+As described in the [Importation chapter](Import.md), it is possible to
+import special phrases from the wiki with the following command:
+
+```sh
+nominatim special-phrases --import-from-wiki
+```
+
+## Importing custom special phrases
+
+But, it is also possible to import some phrases from a csv file. 
+To do so, you have access to the following command:
+
+```sh
+nominatim special-phrases --import-from-csv <csv file>
+```
+
+Note that the two previous import commands will update the phrases from your database.
+This means that if you import some phrases from a csv file, only the phrases
+present in the csv file will be kept into the database. All other phrases will
+be removed.
+
+If you want to only add new phrases and not update the other ones you can add
+the argument `--no-replace` to the import command. For example:
+
+```sh
+nominatim special-phrases --import-from-csv <csv file> --no-replace
+```
+
+This will add the phrases present in the csv file into the database without
+removing the other ones.

docs/customize/Tiger.md

@@ -0,0 +1,28 @@
+# Installing TIGER housenumber data for the US
+
+Nominatim is able to use the official [TIGER](https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.html)
+address set to complement the OSM house number data in the US. You can add
+TIGER data to your own Nominatim instance by following these steps. The
+entire US adds about 10GB to your database.
+
+  1. Get preprocessed TIGER 2021 data:
+
+        cd $PROJECT_DIR
+        wget https://nominatim.org/data/tiger2021-nominatim-preprocessed.csv.tar.gz
+
+  2. Import the data into your Nominatim database:
+
+        nominatim add-data --tiger-data tiger2021-nominatim-preprocessed.csv.tar.gz
+
+  3. Enable use of the Tiger data in your `.env` by adding:
+
+        echo NOMINATIM_USE_US_TIGER_DATA=yes >> .env
+
+  4. Apply the new settings:
+
+        nominatim refresh --functions
+
+
+See the [TIGER-data project](https://github.com/osm-search/TIGER-data) for more
+information on how the data got preprocessed.
+

docs/mkdocs.yml

@@ -19,12 +19,17 @@ pages:
         - 'Import' : 'admin/Import.md'
         - 'Update' : 'admin/Update.md'
         - 'Deploy' : 'admin/Deployment.md'
-        - 'Customize Imports' : 'admin/Customization.md'
-        - 'Tokenizers' : 'admin/Tokenizers.md'
         - 'Nominatim UI'  : 'admin/Setup-Nominatim-UI.md'
         - 'Advanced Installations' : 'admin/Advanced-Installations.md'
         - 'Migration from older Versions' : 'admin/Migration.md'
         - 'Troubleshooting' : 'admin/Faq.md'
+    - 'Customization Guide':
+        - 'Overview': 'customize/Overview.md'
+        - 'Configuration Settings': 'customize/Settings.md'
+        - 'Special Phrases': 'customize/Special-Phrases.md'
+        - 'Tokenizers' : 'customize/Tokenizers.md'
+        - 'External data: US housenumbers from TIGER': 'customize/Tiger.md'
+        - 'External data: Postcodes': 'customize/Postcodes.md'
     - 'Developers Guide':
         - 'Setup for Development' : 'develop/Development-Environment.md'
         - 'Architecture Overview' : 'develop/overview.md'