diff --git a/b2/CHAR b/b2/CHAR
index 4e3a66c..7c27fec 100644
--- a/b2/CHAR
+++ b/b2/CHAR
@@ -1,2 +1,2 @@
-FOO R101X	FP=0603 R=100R TOL=5%
-FOO R102Y	FP=0603 R=1k TOL=1%
+FOO R101X	T=R FP=0603 R=100R TOL=5% GAGA=1
+FOO R102Y	T=R FP=0603 R=1k TOL=1%
diff --git a/b2/db.c b/b2/db.c
index 1f45359..96fc525 100644
--- a/b2/db.c
+++ b/b2/db.c
@@ -10,9 +10,12 @@
  */
 
 
+#include <stdlib.h>
 #include <glib.h>
 
 #include "util.h"
+#include "lang.h"
+#include "chr.h"
 #include "db.h"
 
 
@@ -80,3 +83,72 @@ void part_alias(struct part *a, struct part *b)
 	b->prev = a;
 	tmp->prev = tmp2;
 }
+
+
+static void convert_params(struct param **params,
+    const struct field *f, struct param ***res)
+{
+	struct param **p, *prm;
+	const struct selector *sel;
+	const struct condition *cond;
+
+	while (f) {
+		for (p = params; *p; p = &(*p)->next)
+			if ((*p)->u.name == f->name)
+				break;
+		if (!*p) {
+			f = f->next;
+			continue;
+		}
+
+		/* remove from list */
+		prm = *p;
+		*p = prm->next;
+
+		/* convert parameter */
+		prm->u.field = f;
+		if (!evaluate(f->fmt, prm->value.u.name, &prm->value))
+			yyerrorf("invalid value for %s", f->name);
+
+		/* add to result list */
+		**res = prm;
+		*res = &prm->next;
+		prm->next = NULL;
+
+		/* process selections */
+		for (sel = f->sel; sel; sel = sel->next) {
+			for (cond = sel->cond; cond; cond = cond->next)
+				if (compare(f->fmt, &prm->value, cond->relop,
+				    &cond->value))
+					break;
+			if (cond) {
+				convert_params(params, sel->act.fields, res);
+				convert_params(params, sel->act.rules, res);
+				break;
+			}
+		}
+		if (!sel) {
+			convert_params(params, f->any.fields, res);
+			convert_params(params, f->any.rules, res);
+		}
+
+		f = f->next;
+	}
+}
+
+
+void part_finalize(struct part *part, const struct field *field)
+{
+	struct param *param = part->param;
+	struct param **res = &part->param;
+	struct param *next;
+
+	part->param = NULL;
+	convert_params(&param, field, &res);
+	while (param) {
+		yywarnf("extra parameter: %s", param->u.name);
+		next = param->next;
+		free(param);
+		param = next;
+	}
+}
diff --git a/b2/db.h b/b2/db.h
index db6ec41..0adfbb1 100644
--- a/b2/db.h
+++ b/b2/db.h
@@ -62,5 +62,6 @@ struct part {
 struct part *part_lookup(const char *domain, const char *name);
 struct part *part_add(const char *domain, const char *name);
 void part_alias(struct part *a, struct part *b);
+void part_finalize(struct part *part, const struct field *field);
 
 #endif /* !DB_H */
diff --git a/b2/lang.y b/b2/lang.y
index 0d6eefc..15a0404 100644
--- a/b2/lang.y
+++ b/b2/lang.y
@@ -23,6 +23,8 @@
 #include "y.tab.h"
 
 
+static const struct field *hierarchy;
+
 static struct field_stack {
 	const struct field *field;
 	struct field_stack *next;
@@ -101,6 +103,7 @@ hierarchy:
 	nameset hierarchy
 	| rule
 		{
+			hierarchy = $1;
 			field_dump(stderr, $1);
 		}
 	;
@@ -348,6 +351,9 @@ format:
 characteristics:
 	| TOK_NL
 	| part characteristics
+		{
+			part_finalize($1, hierarchy);
+		}
 	;
 
 part: