diff --git a/src/tap/config/tap_configuration_file.html b/src/tap/config/tap_configuration_file.html
index 65e54ebb31051d58040eb49e2183db143ca64b20..132ffceeba48c9b03b617cc34b711b3d13f065b4 100644
--- a/src/tap/config/tap_configuration_file.html
+++ b/src/tap/config/tap_configuration_file.html
@@ -857,20 +857,42 @@
<td>text</td>
<td>
<p>Comma-separated list of all allowed UDFs (User Defined Functions).</p>
- <p>
-
- Each item of the list must have the following syntax: <code>[fct_signature]</code>,
- <code>[fct_signature, className]</code> or <code>[fct_signature, className, description]</code>.
- <i>fct_function</i> is the function signature. Its syntax is the same as in
+ <p>Each item of the list must follow one of these syntaxes:</p>
+ <ul>
+ <li><code>[fct_signature]</code></li>
+ <li><code>[fct_signature, transPattern]</code></li>
+ <li><code>[fct_signature, transPattern, description]</code></li>
+ <li><code>[fct_signature, className]</code></li>
+ <li><code>[fct_signature, className, description]</code></li>
+ </ul>
+ <p>
+ <code>fct_function</code> is the function signature. Its syntax is the same as in
<a href="http://www.ivoa.net/documents/TAPRegExt/20120827/REC-TAPRegExt-1.0.html#langs">TAPRegExt</a>.
+ </p>
+ <p>
+ <i>transPattern</i> is a simple way to translate the ADQL function into the target
+ language (e.g. SQL). The string will represent the exact translation of the
+ function. It is possible to insert arguments with <code>$i</code> (where i is an
+ integer > 0 corresponding to the argument index). This translation pattern is
+ very useful when just the name of the function or the order of arguments is
+ different from the ADQL function, or if a simple operation in the target
+ language (e.g. math operation) is required (note that it will not be executed
+ in the TAP library but in the database). If a more complex translation is
+ required, you should give <i>className</i> instead (see next paragraph).
+ </p>
+ <p>
<i>className</i> is the name of a class extending UserDefinedFunction.
An instance of this class will replace any reference of a UDF written in an
ADQL function with the associated signature. A class name must be specified if
the function to represent has a signature (and more particularly a name)
- different in ADQL and in SQL. <i>description</i> is the human description of the
- function to be displayed in the <i>/capabilities</i> of the TAP service. It must be
+ different in ADQL and in SQL. description is the human description of the
+ function to be displayed in the /capabilities of the TAP service. It must be
written between double quotes.
</p>
+ <p>
+ <i>description</i> is the human description of this function. It will be visible in
+ the TAP's capabilities.
+ </p>
<p>
If the list is empty (no item), all unknown functions are forbidden. And if the special value <code>ANY</code> is given, any unknown function is allowed ;
consequently the unknown ADQL functions will be translated into SQL as they are in ADQL.
@@ -880,6 +902,8 @@
<td><ul><li>ΓΈ <em>(default)</em></li>
<li>ANY</li>
<li>[trim(txt String) -> String], [random() -> DOUBLE]</li>
+ <li>[ivo_lower(str varchar)->varchar, "lower($1)"]</li>
+ <li>[ivo_nocasematch(value varchar, pattern varchar)->integer, "CAST($1 ILIKE $2 AS INTEGER)", "Compare a string with a given LIKE's SQL pattern in a case-insensitive way."]</li>
<li>[newFct(x double)->double, {apackage.MyNewFunction}]</li>
<li>[ivo_healpix_index(hpxOrder integer, ra double, dec double) -> bigint, {adql.query.operand.function.healpix.HealpixIndex}, "Compute the index of the \"Healpix cell\" containing the specified position at the given Healpix order."]</li>
<li>[random() -> DOUBLE,,"Generate a random number."]</li>
diff --git a/src/tap/config/tap_full.properties b/src/tap/config/tap_full.properties
index a80320fbb72ace17cf3f6ad83bc36bec2df65d7b..810b9a25d390e3f6ac9a23b5ee17441c4037dfa0 100644
--- a/src/tap/config/tap_full.properties
+++ b/src/tap/config/tap_full.properties
@@ -1,8 +1,8 @@
################################################################################
# FULL TAP CONFIGURATION FILE #
# #
-# TAP Version: 2.3 #
-# Date: 20 March. 2019 #
+# TAP Version: 2.4 #
+# Date: 21 August 2020 #
# Author: Gregory Mantelet (CDS;ARI) #
# #
################################################################################
@@ -751,24 +751,49 @@ geometries =
# [OPTIONAL]
# Comma-separated list of all allowed UDFs (User Defined Functions).
#
-# Each item of the list must have the following syntax: [fct_signature],
-# [fct_signature, className] or [fct_signature, className, description].
-# fct_function is the function signature. Its syntax is the same as in
-# TAPRegExt. className is the name of a class extending UserDefinedFunction.
+# Each item of the list must follow one of these syntaxes:
+# [fct_signature],
+# [fct_signature, transPattern],
+# [fct_signature, transPattern, description],
+# [fct_signature, className],
+# [fct_signature, className, description].
+#
+# `fct_function` is the function signature. Its syntax is the same as in
+# TAPRegExt.
+#
+# `transPattern` is a simple way to translate the ADQL function into the target
+# language (e.g. SQL). The string will represent the exact translation of the
+# function. It is possible to insert arguments with `$i` (where i is an
+# integer > 0 corresponding to the argument index). This translation pattern is
+# very useful when just the name of the function or the order of arguments is
+# different from the ADQL function, or if a simple operation in the target
+# language (e.g. math operation) is required (note that it will not be executed
+# in the TAP library but in the database). If a more complex translation is
+# required, you should give `className` instead (see next paragraph).
+#
+# `className` is the name of a class extending UserDefinedFunction.
# An instance of this class will replace any reference of a UDF written in an
# ADQL function with the associated signature. A class name must be specified if
# the function to represent has a signature (and more particularly a name)
# different in ADQL and in SQL. description is the human description of the
# function to be displayed in the /capabilities of the TAP service. It must be
# written between double quotes.
-#
-# Example: udfs = [ivo_healpix_index(hpxOrder integer, ra double, dec double)
-# -> bigint, {adql.query.operand.function.healpix.HealpixIndex}
-# , "Compute the index of the \"Healpix cell\" containing the
-# specified position at the given Healpix order."],
-# [trim(txt String) -> String],
-# [newFct(x double)->double, {apackage.MyNewFunction}],
-# [random() -> DOUBLE,,"Generate a random number."]
+#
+# `description` is the human description of this function. It will be visible in
+# the TAP's capabilities.
+#
+# Example: udfs = [ivo_healpix_index(hpxOrder integer, ra double, dec double) \
+# -> bigint, \
+# {adql.query.operand.function.healpix.HealpixIndex}, \
+# "Compute the index of the \"Healpix cell\" containing the \
+# specified position at the given Healpix order."], \
+# [trim(txt String) -> String], \
+# [newFct(x double)->double, {apackage.MyNewFunction}], \
+# [random() -> DOUBLE,,"Generate a random number."], \
+# [ivo_lower(str varchar)->varchar, "lower($1)"], \
+# [ivo_nocasematch(value varchar, pattern varchar)->integer, \
+# "CAST($1 ILIKE $2 AS INTEGER)", \
+# "Compare a string with a given LIKE's SQL pattern in a case-insensitive way."]
#
# If the list is empty (no item), all unknown functions are forbidden. And if
# the special value ANY is given, any unknown function is allowed ; consequently
diff --git a/src/tap/config/tap_min.properties b/src/tap/config/tap_min.properties
index 93b33e16134d065994aa57b70b68899887da5628..92bb2a5e669755e38127c4250a39f82581cc12f0 100644
--- a/src/tap/config/tap_min.properties
+++ b/src/tap/config/tap_min.properties
@@ -1,8 +1,8 @@
################################################################################
# MINIMUM TAP CONFIGURATION FILE #
# #
-# TAP Version: 2.3 #
-# Date: 11 Apr. 2019 #
+# TAP Version: 2.4 #
+# Date: 21 August 2020 #
# Author: Gregory Mantelet (CDS;ARI) #
# #
################################################################################