diff --git a/src/mapcss/Condition.py b/src/mapcss/Condition.py
index 5b8e385..d04c66e 100644
--- a/src/mapcss/Condition.py
+++ b/src/mapcss/Condition.py
@@ -40,7 +40,11 @@ class Condition:
     if self.params[0][:2] == "::":
       return []
     return set([self.params[0]])
-    
+  def get_numerics(self):
+    if self.type in ("<", ">", ">=", "<="):
+      return self.params[0]
+    else:
+      return False
   def test(self, tags):
     """
     Test a hash against this condition
@@ -126,13 +130,13 @@ class Condition:
         return params[0], '"%s" IS NULL'%(params[0])
         
       if t == '<':
-        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+(\.[[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) < %s"""%(params[0],params[0],params[1])
+        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+([.][[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) &lt; %s"""%(params[0],params[0],params[1])
       if t == '<=':
-        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+(\.[[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) <= %s"""%(params[0],params[0],params[1])
+        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+([.][[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) &lt;= %s"""%(params[0],params[0],params[1])
       if t == '>':
-        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+(\.[[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) > %s"""%(params[0],params[0],params[1])
+        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+([.][[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) > %s"""%(params[0],params[0],params[1])
       if t == '>=':
-        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+(\.[[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) >= %s"""%(params[0],params[0],params[1])
+        return params[0], """(CASE WHEN "%s"  ~  E'^[[:digit:]]+([.][[:digit:]]+)?$' THEN CAST ("%s" AS FLOAT) ELSE 0 END) >= %s"""%(params[0],params[0],params[1])
     except KeyError:
       pass
   def get_mapnik_filter(self):
@@ -159,13 +163,13 @@ class Condition:
         return '[%s] = \'\''%(params[0])
 
       if t == '<':
-        return '[%s] &lt; %s'%(params[0], float(params[1]))
+        return '[%s__num] &lt; %s'%(params[0], float(params[1]))
       if t == '<=':
-        return '[%s] &lt;= %s'%(params[0], float(params[1]))
+        return '[%s__num] &lt;= %s'%(params[0], float(params[1]))
       if t == '>':
-        return '[%s] &gt; %s'%(params[0], float(params[1]))
+        return '[%s__num] &gt; %s'%(params[0], float(params[1]))
       if t == '>=':
-        return '[%s] &gt;= %s'%(params[0], float(params[1]))
+        return '[%s__num] &gt;= %s'%(params[0], float(params[1]))
       #return ""
     except KeyError:
       pass
diff --git a/src/mapcss/Rule.py b/src/mapcss/Rule.py
index a3ad858..e406ee5 100644
--- a/src/mapcss/Rule.py
+++ b/src/mapcss/Rule.py
@@ -61,7 +61,12 @@ class Rule():
     for condition in self.conditions:
       a.update(condition.get_interesting_tags())
     return a
-
+  def get_numerics(self):
+    a = set()
+    for condition in self.conditions:
+      a.add(condition.get_numerics())
+    a.discard(False)
+    return a
   def get_sql_hints(self, obj, zoom):
     if obj:
       if (self.subject!='') and not _test_feature_compatibility(obj, self.subject, {":area":"yes"}):
diff --git a/src/mapcss/StyleChooser.py b/src/mapcss/StyleChooser.py
index 149fad1..0a35cd2 100644
--- a/src/mapcss/StyleChooser.py
+++ b/src/mapcss/StyleChooser.py
@@ -49,6 +49,17 @@ class StyleChooser:
     self.stylepos=0
 
 
+  def get_numerics(self):
+    """
+    Returns a set of number-compared values.
+    """
+    a = set()
+    for c in self.ruleChains:
+      for r in c:
+        a.update(r.get_numerics())
+    a.discard(False)
+    return a
+
   def get_interesting_tags(self, type, zoom):
     """
     Returns a set of tags that were used in here.
@@ -77,10 +88,7 @@ class StyleChooser:
       for r in c:
         p = r.get_sql_hints(type, zoom)
         if p:
-          #print p
-
           q = "("+p[1] + ")"#[t[1] for t in p]
-          #print q
           if q == "()":
             q = ""
           if b and q:
diff --git a/src/mapcss/__init__.py b/src/mapcss/__init__.py
index 6488de8..081249d 100644
--- a/src/mapcss/__init__.py
+++ b/src/mapcss/__init__.py
@@ -313,10 +313,10 @@ def parseCondition(s):
               log.debug("condition NE: %s = %s"%(a[0], a[1]))
               return  Condition('ne'     ,a)
               ## FIXME: convert other conditions to python
-            if      CONDITION_GT.match(s):
-              a = CONDITION_GT.match(s).groups()
-              log.debug("condition GT: %s > %s"%(a[0], a[1]))
-              return  Condition('>'     ,a)
+            if      CONDITION_LE.match(s):
+              a = CONDITION_LE.match(s).groups()
+              log.debug("condition LE: %s <= %s"%(a[0], a[1]))
+              return  Condition('<='     ,a)
             if      CONDITION_GE.match(s):
               a = CONDITION_GE.match(s).groups()
               log.debug("condition GE: %s >= %s"%(a[0], a[1]))
@@ -325,10 +325,11 @@ def parseCondition(s):
               a = CONDITION_LT.match(s).groups()
               log.debug("condition LT: %s < %s"%(a[0], a[1]))
               return  Condition('<'     ,a)
-            if      CONDITION_LE.match(s):
-              a = CONDITION_LE.match(s).groups()
-              log.debug("condition LE: %s <= %s"%(a[0], a[1]))
-              return  Condition('<='     ,a)
+            if      CONDITION_GT.match(s):
+              a = CONDITION_GT.match(s).groups()
+              log.debug("condition GT: %s > %s"%(a[0], a[1]))
+              return  Condition('>'     ,a)
+
             if      CONDITION_REGEX.match(s):
               a = CONDITION_REGEX.match(s).groups()
               log.debug("condition REGEX: %s = %s"%(a[0], a[1]))