diff --git a/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/context/functions/FunctionDeclarationParsing.java b/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/context/functions/FunctionDeclarationParsing.java
index bd7b38296e39..38b25440a6eb 100644
--- a/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/context/functions/FunctionDeclarationParsing.java
+++ b/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/context/functions/FunctionDeclarationParsing.java
@@ -102,7 +102,7 @@ public class FunctionDeclarationParsing {
 
     XPathType r = null;
     if ("numeric".equals(type)) {
-      r = XPathType.NUMBER;
+      r = XPath2Type.NUMERIC;
     } else if (type.startsWith("xs:")) {
       final String base = type.substring(3);
       r = XPath2Type.fromName(new QName(XPath2Type.XMLSCHEMA_NS, base));
diff --git a/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2StaticTypeTest.java b/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2StaticTypeTest.java
index e7d2a5e1722f..190dba7570ed 100644
--- a/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2StaticTypeTest.java
+++ b/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2StaticTypeTest.java
@@ -23,20 +23,46 @@ import org.intellij.lang.xpath.psi.XPathType;
 public class XPath2StaticTypeTest extends TestCase {
 
   public void testStatic() throws Throwable {
-    assertTrue(XPathType.isAssignable(XPath2Type.ITEM, XPath2Type.STRING));
+    assertTrue(XPathType.isAssignable(XPath2Type.NODE, XPath2Type.ITEM));
 
-    assertTrue(XPathType.isAssignable(XPath2Type.STRING, XPath2Type.ANYURI));
+    assertFalse(XPathType.isAssignable(XPath2Type.NODE, XPath2Type.STRING));
+  }
+
+  public void testBooleanAssignability() {
+    // via "effective boolean value"
+    assertTrue(XPathType.isAssignable(XPath2Type.BOOLEAN, XPath2Type.STRING));
+    assertTrue(XPathType.isAssignable(XPath2Type.BOOLEAN, XPath2Type.NUMERIC));
+    assertTrue(XPathType.isAssignable(XPath2Type.BOOLEAN, XPath2Type.INTEGER));
+
+    assertFalse(XPathType.isAssignable(XPath2Type.BOOLEAN_STRICT, XPath2Type.STRING));
+  }
+
+  public void testAnyAssignability() {
+    assertTrue(XPathType.isAssignable(XPath2Type.ITEM, XPath2Type.STRING));
+    assertTrue(XPathType.isAssignable(XPath2Type.ITEM, XPath2Type.BOOLEAN));
+    assertTrue(XPathType.isAssignable(XPath2Type.ITEM, XPath2Type.DATE));
+  }
+
+  public void testNumericAssignability() {
+    assertTrue(XPathType.isAssignable(XPath2Type.FLOAT, XPath2Type.INTEGER));
 
     assertTrue(XPathType.isAssignable(XPath2Type.DOUBLE, XPath2Type.FLOAT));
     assertTrue(XPathType.isAssignable(XPath2Type.DOUBLE, XPath2Type.INTEGER));
 
-    assertTrue(XPathType.isAssignable(XPath2SequenceType.create(XPath2Type.STRING), XPath2SequenceType.create(XPath2Type.STRING)));
+    assertTrue(XPathType.isAssignable(XPath2Type.FLOAT, XPath2Type.DOUBLE));
+
+    assertFalse(XPathType.isAssignable(XPath2Type.NUMERIC, XPath2Type.BOOLEAN));
+  }
+
+  public void testStringAssignability() {
+    assertTrue(XPathType.isAssignable(XPath2Type.STRING, XPath2Type.ANYURI));
     assertTrue(XPathType.isAssignable(XPath2Type.STRING, XPath2SequenceType.create(XPath2Type.STRING)));
+
+    assertTrue(XPathType.isAssignable(XPath2SequenceType.create(XPath2Type.STRING), XPath2SequenceType.create(XPath2Type.STRING)));
     assertTrue(XPathType.isAssignable(XPath2SequenceType.create(XPath2Type.STRING), XPath2Type.STRING));
 
-    assertFalse(XPathType.isAssignable(XPath2SequenceType.create(XPath2Type.STRING), XPath2SequenceType.create(XPath2Type.INTEGER)));
-
     assertFalse(XPathType.isAssignable(XPath2Type.STRING, XPath2Type.INTEGER));
-    assertFalse(XPathType.isAssignable(XPath2Type.NODE, XPath2Type.STRING));
+
+    assertFalse(XPathType.isAssignable(XPath2SequenceType.create(XPath2Type.STRING), XPath2SequenceType.create(XPath2Type.INTEGER)));
   }
 }
diff --git a/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2TypeTest.java b/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2TypeTest.java
index 123e98c33760..6e3ae03d90c5 100644
--- a/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2TypeTest.java
+++ b/plugins/xpath/xpath-lang/test/org/intellij/lang/xpath/XPath2TypeTest.java
@@ -89,6 +89,10 @@ public class XPath2TypeTest extends XPath2HighlightingTestBase {
     doXPathHighlighting();
   }
 
+  public void testToNumericIDEA67335() throws Throwable {
+    doXPathHighlighting();
+  }
+
   @Override
   protected String getSubPath() {
     return "xpath/highlighting/types";
diff --git a/plugins/xpath/xpath-lang/testData/xpath/highlighting/types/toNumericIDEA67335.xpath2 b/plugins/xpath/xpath-lang/testData/xpath/highlighting/types/toNumericIDEA67335.xpath2
new file mode 100644
index 000000000000..f58a6ab00bea
--- /dev/null
+++ b/plugins/xpath/xpath-lang/testData/xpath/highlighting/types/toNumericIDEA67335.xpath2
@@ -0,0 +1 @@
+ceiling(<error descr="Expected type 'xs:numeric?', got 'xs:boolean'">0 = 1</error>) + floor(<error descr="Expected type 'xs:numeric?', got 'xs:string'">'a'</error>) + round(.)
\ No newline at end of file