Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 17952)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 17953)
@@ -345,12 +345,23 @@
 }
 
-/* only {0.key}, #11104, #12422, #14950, #19572 */
-*[lanes][eval(number_of_tags()) = 1],
-*[surface][eval(number_of_tags()) = 1],
-*[access][eval(number_of_tags()) = 1],
-*[area][eval(number_of_tags()) = 1]!.area_yes_autofix,
-*[name][eval(number_of_tags()) = 1],
-*[ref][eval(number_of_tags()) = 1],
-*[lit][eval(number_of_tags()) = 1] {
+/* only {0.key}, #11104, #12422, #14950, #19572, #20902 */
+/* relations excluded as there is a test for missing type=* plus several other test depending on the type exist */
+node[access][eval(number_of_tags()) = 1],
+way[access][eval(number_of_tags()) = 1],
+node[area][eval(number_of_tags()) = 1]!.area_yes_autofix,
+way[area][eval(number_of_tags()) = 1]!.area_yes_autofix,
+node[lanes][eval(number_of_tags()) = 1],
+way[lanes][eval(number_of_tags()) = 1],
+node[layer][eval(number_of_tags()) = 1],
+way[layer][eval(number_of_tags()) = 1],
+way[level][eval(number_of_tags()) = 1], /* nodes might be valid, e.g. start and end nodes of steps */
+node[lit][eval(number_of_tags()) = 1],
+way[lit][eval(number_of_tags()) = 1],
+node[name][eval(number_of_tags()) = 1],
+way[name][eval(number_of_tags()) = 1],
+node[ref][eval(number_of_tags()) = 1],
+way[ref][eval(number_of_tags()) = 1],
+node[surface][eval(number_of_tags()) = 1],
+way[surface][eval(number_of_tags()) = 1] {
   throwWarning: tr("incomplete object: only {0}", "{0.key}");
   set only_one_tag;
@@ -364,5 +375,6 @@
 }
 /* only {0.tag}, #15269 */
-*[tourism=attraction][eval(number_of_tags()) = 1] {
+node[tourism=attraction][eval(number_of_tags()) = 1], 
+way[tourism=attraction][eval(number_of_tags()) = 1] {
   throwWarning: tr("incomplete object: only {0}", "{0.tag}");
   group: tr("missing tag");
Index: trunk/resources/data/validator/numeric.mapcss
===================================================================
--- trunk/resources/data/validator/numeric.mapcss	(revision 17952)
+++ trunk/resources/data/validator/numeric.mapcss	(revision 17953)
@@ -134,4 +134,47 @@
 }
 
+*[roof:height][roof:height =~ /^0*(\.0*)?( (m|ft))?$/][roof:shape=flat] {
+  throwWarning: tr("{0} is unnecessary for {1}", "{0.tag}", "{2.tag}");
+  group: tr("unnecessary tag");
+  fixRemove: "{0.key}";
+  set zero_roof_height_flat;
+  assertMatch: "node roof:height=0 roof:shape=flat";
+  assertMatch: "node roof:shape=flat roof:height=\"00.00000 ft\" roof:shape=flat";
+  assertNoMatch: "node roof:shape=flat roof:height=2 m roof:shape=flat";
+  assertNoMatch: "node roof:height=0 roof:shape=gabled";
+}
+*[roof:height][roof:height =~ /^[0-9]+(\.[0-9]+)?(( )*(metre|metres|meter|meters|Metre|Metres|Meter|Meters)|m)$/]!.zero_roof_height_flat {
+  throwWarning: tr("unusual value of {0}: use abbreviation for unit and space between value and unit", "{0.key}");
+  set roof_height_meter_autofix;
+  fixAdd: concat("roof:height=", get(regexp_match("([0-9.]+)( )*(.+)",tag("roof:height")),1)," m");
+  assertMatch: "node roof:height=6.78 meters";
+  assertMatch: "node roof:height=5  metre";
+  assertMatch: "node roof:height=2m";
+  assertNoMatch: "node roof:height=2 m";
+  assertNoMatch: "node roof:height=5";
+}
+*[roof:height][roof:height =~ /^[0-9]+(\.[0-9]+)?(( )*(foot|Foot|feet|Feet)|ft)$/]!.zero_roof_height_flat {
+  throwWarning: tr("unusual value of {0}: use abbreviation for unit and space between value and unit", "{0.key}");
+  set roof_height_foot_autofix;
+  fixAdd: concat("roof:height=", get(regexp_match("([0-9.]+)( )*(.+)",tag("roof:height")),1)," ft");
+  assertMatch: "node roof:height=6.78 foot";
+  assertMatch: "node roof:height=5  Feet";
+  assertMatch: "node roof:height=2ft";
+  assertNoMatch: "node roof:height=2 ft";
+  assertNoMatch: "node roof:height=5";
+}
+*[roof:height][roof:height =~ /^[0-9]+,[0-9][0-9]?( (m|ft))?$/] {
+  throwWarning: tr("unusual value of {0}: use . instead of , as decimal separator", "{0.key}");
+  fixAdd: concat("roof:height=", replace(tag("roof:height"), ",", "."));
+  set roof_height_separator_autofix;
+  assertMatch: "node roof:height=5,5";
+  assertMatch: "node roof:height=12,00";
+  assertMatch: "node roof:height=12,5 ft";
+  assertNoMatch: "node roof:height=12,000";
+  assertNoMatch: "node roof:height=3,50,5";
+  assertNoMatch: "node roof:height=3.5";
+  assertNoMatch: "node roof:height=4";
+}
+
 *[maxlength][maxlength =~ /^[1-9][0-9]*(\.[0-9]+)?(( )*(metre|metres|meter|meters|Metre|Metres|Meter|Meters)|m)$/] {
   throwWarning: tr("unusual value of {0}: use abbreviation for unit and space between value and unit", "{0.key}");
@@ -231,9 +274,10 @@
 }
 
-*[height      ][height !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([1-9][0-9]*\'((10|11|[0-9])((\.[0-9]+)?)\")?))$/]!.height_separator_autofix!.height_meter_autofix!.height_foot_autofix,
-*[maxheight][maxheight !~ /^(([1-9][0-9]*(\.[0-9]+)?( (m|ft))?)|([0-9]+\'(([0-9]|10|11)(\.[0-9]*)?\")?)|none|default|below_default)$/]!.maxheight_separator_autofix!.maxheight_meter_autofix!.maxheight_foot_autofix,
-*[maxlength][maxlength !~ /^(([1-9][0-9]*(\.[0-9]+)?( (m|ft))?)|([0-9]+\'(([0-9]|10|11)(\.[0-9]*)?\")?)|none|default|below_default)$/]!.maxlength_separator_autofix!.maxlength_meter_autofix!.maxlength_foot_autofix,
-*[width        ][width !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([0-9]+\'([0-9]+(\.[0-9]+)?\")?))$/]!.width_separator_autofix!.width_meter_autofix!.width_foot_autofix,
-*[maxwidth  ][maxwidth !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([0-9]+\'([0-9]+(\.[0-9]+)?\")?))$/]!.maxwidth_separator_autofix!.maxwidth_meter_autofix!.maxwidth_foot_autofix {
+*[height     ][height      !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([1-9][0-9]*\'((10|11|[0-9])((\.[0-9]+)?)\")?))$/]!.height_separator_autofix!.height_meter_autofix!.height_foot_autofix,
+*[maxheight  ][maxheight   !~ /^(([1-9][0-9]*(\.[0-9]+)?( (m|ft))?)|([0-9]+\'(([0-9]|10|11)(\.[0-9]*)?\")?)|none|default|below_default)$/]!.maxheight_separator_autofix!.maxheight_meter_autofix!.maxheight_foot_autofix,
+*[roof:height][roof:height !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([1-9][0-9]*\'((10|11|[0-9])((\.[0-9]+)?)\")?))$/]!.roof_height_separator_autofix!.roof_height_meter_autofix!.roof_height_foot_autofix!.zero_roof_height_flat,
+*[maxlength  ][maxlength   !~ /^(([1-9][0-9]*(\.[0-9]+)?( (m|ft))?)|([0-9]+\'(([0-9]|10|11)(\.[0-9]*)?\")?)|none|default|below_default)$/]!.maxlength_separator_autofix!.maxlength_meter_autofix!.maxlength_foot_autofix,
+*[width      ][width       !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([0-9]+\'([0-9]+(\.[0-9]+)?\")?))$/]!.width_separator_autofix!.width_meter_autofix!.width_foot_autofix,
+*[maxwidth   ][maxwidth    !~ /^(([0-9]+(\.[0-9]+)?( (m|ft))?)|([0-9]+\'([0-9]+(\.[0-9]+)?\")?))$/]!.maxwidth_separator_autofix!.maxwidth_meter_autofix!.maxwidth_foot_autofix {
   throwWarning: tr("unusual value of {0}: {1} is default; only positive values; point is decimal separator; if units, put space then unit", "{0.key}", "meters");
   assertMatch: "node height=medium";