add documentation for housenumber analyzer

diff --git a/docs/customize/Tokenizers.md b/docs/customize/Tokenizers.md
index f75bc6a5c9da88fad8b92bc046337d2fcebff863..d849eb48c0d457c7c57b27e2807ff55675e2fa33 100644 (file)
--- a/docs/customize/Tokenizers.md
+++ b/docs/customize/Tokenizers.md
@@ -206,15 +206,16 @@ by a sanitizer (see for example the
 The token-analysis section contains the list of configured analyzers. Each
 analyzer must have an `id` parameter that uniquely identifies the analyzer.
 The only exception is the default analyzer that is used when no special
 The token-analysis section contains the list of configured analyzers. Each
 analyzer must have an `id` parameter that uniquely identifies the analyzer.
 The only exception is the default analyzer that is used when no special

-analyzer was selected.
+analyzer was selected. There is one special id '@housenumber'. If an analyzer
+with that name is present, it is used for normalization of house numbers.

 
 Different analyzer implementations may exist. To select the implementation,
 
 Different analyzer implementations may exist. To select the implementation,

-the `analyzer` parameter must be set. Currently there is only one implementation
-`generic` which is described in the following.
+the `analyzer` parameter must be set. The different implementations are
+described in the following.

 
 ##### Generic token analyzer
 
 
 ##### Generic token analyzer
 

-The generic analyzer is able to create variants from a list of given
+The generic analyzer `generic` is able to create variants from a list of given

 abbreviation and decomposition replacements and introduce spelling variations.
 
 ###### Variants
 abbreviation and decomposition replacements and introduce spelling variations.
 
 ###### Variants


@@ -331,6 +332,14 @@ the mode by adding:
 
 to the analyser configuration.
 
 
 to the analyser configuration.
 

+##### Housenumber token analyzer
+
+The analyzer `housenumbers` is purpose-made to analyze house numbers. It
+creates variants with optional spaces between numbers and letters. Thus,
+house numbers of the form '3 a', '3A', '3-A' etc. are all considered equivalent.
+
+The analyzer cannot be customized.
+

 ### Reconfiguration
 
 Changing the configuration after the import is currently not possible, although
 ### Reconfiguration
 
 Changing the configuration after the import is currently not possible, although