diff --git a/mapping/config.go b/mapping/config.go
index 4b46da5..af2d374 100644
--- a/mapping/config.go
+++ b/mapping/config.go
@@ -2,9 +2,7 @@ package mapping
 
 import (
 	"encoding/json"
-	"flag"
 	"goposm/element"
-	"log"
 	"os"
 )
 
@@ -32,8 +30,25 @@ type Mapping struct {
 	Tables Tables `json:"tables"`
 }
 
-func (t *Table) Mappings() map[string][]string {
-	return t.Mapping
+type ElementFilter func(elem element.OSMElem) bool
+
+type TagTables map[string]map[string][]string
+
+func NewMapping(filename string) (*Mapping, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	decoder := json.NewDecoder(f)
+
+	mapping := Mapping{}
+	err = decoder.Decode(&mapping)
+	if err != nil {
+		return nil, err
+	}
+
+	mapping.prepare()
+	return &mapping, nil
 }
 
 func (t *Table) ExtraTags() map[string]bool {
@@ -52,12 +67,12 @@ func (m *Mapping) prepare() {
 	}
 }
 
-func (m *Mapping) mappings(tableType string, mappings map[string]map[string][]string) {
+func (m *Mapping) mappings(tableType string, mappings TagTables) {
 	for name, t := range m.Tables {
 		if t.Type != tableType {
 			continue
 		}
-		for key, vals := range t.Mappings() {
+		for key, vals := range t.Mapping {
 			for _, v := range vals {
 				vals, ok := mappings[key]
 				if ok {
@@ -97,8 +112,8 @@ func (m *Mapping) extraTags(tableType string, tags map[string]bool) {
 	}
 }
 
-func (m *Mapping) elemFilters() map[string][]elemFilter {
-	result := make(map[string][]elemFilter)
+func (m *Mapping) ElementFilters() map[string][]ElementFilter {
+	result := make(map[string][]ElementFilter)
 	for name, t := range m.Tables {
 		if t.Filters == nil {
 			continue
@@ -119,227 +134,3 @@ func (m *Mapping) elemFilters() map[string][]elemFilter {
 	}
 	return result
 }
-
-func (m *Mapping) NodeTagFilter() *TagFilter {
-	mappings := make(map[string]map[string][]string)
-	m.mappings("point", mappings)
-	tags := make(map[string]bool)
-	m.extraTags("point", tags)
-	return &TagFilter{mappings, tags}
-}
-
-func (m *Mapping) WayTagFilter() *TagFilter {
-	mappings := make(map[string]map[string][]string)
-	m.mappings("linestring", mappings)
-	m.mappings("polygon", mappings)
-	tags := make(map[string]bool)
-	m.extraTags("linestring", tags)
-	m.extraTags("polygon", tags)
-	return &TagFilter{mappings, tags}
-}
-
-func (m *Mapping) RelationTagFilter() *RelationTagFilter {
-	mappings := make(map[string]map[string][]string)
-	m.mappings("linestring", mappings)
-	m.mappings("polygon", mappings)
-	tags := make(map[string]bool)
-	m.extraTags("linestring", tags)
-	m.extraTags("polygon", tags)
-	tags["type"] = true // do not filter out type tag
-	return &RelationTagFilter{TagFilter{mappings, tags}}
-}
-
-func (m *Mapping) PointMatcher() *TagMatcher {
-	mappings := make(map[string]map[string][]string)
-	m.mappings("point", mappings)
-	filters := m.elemFilters()
-	return &TagMatcher{mappings, m.tables("point"), filters}
-}
-
-func (m *Mapping) LineStringMatcher() *TagMatcher {
-	mappings := make(map[string]map[string][]string)
-	m.mappings("linestring", mappings)
-	filters := m.elemFilters()
-	return &TagMatcher{mappings, m.tables("linestring"), filters}
-}
-
-func (m *Mapping) PolygonMatcher() *TagMatcher {
-	mappings := make(map[string]map[string][]string)
-	m.mappings("polygon", mappings)
-	filters := m.elemFilters()
-	return &TagMatcher{mappings, m.tables("polygon"), filters}
-}
-
-type TagFilter struct {
-	mappings  map[string]map[string][]string
-	extraTags map[string]bool
-}
-
-type RelationTagFilter struct {
-	TagFilter
-}
-
-func (f *TagFilter) Filter(tags map[string]string) bool {
-	foundMapping := false
-	for k, v := range tags {
-		values, ok := f.mappings[k]
-		if ok {
-			if _, ok := values["__any__"]; ok {
-				foundMapping = true
-				continue
-			} else if _, ok := values[v]; ok {
-				foundMapping = true
-				continue
-			} else if _, ok := f.extraTags[k]; !ok {
-				delete(tags, k)
-			}
-		} else if _, ok := f.extraTags[k]; !ok {
-			delete(tags, k)
-		}
-	}
-	if foundMapping {
-		return true
-	} else {
-		return false
-	}
-}
-
-func (f *RelationTagFilter) Filter(tags map[string]string) bool {
-	if t, ok := tags["type"]; ok {
-		if t != "multipolygon" && t != "boundary" && t != "land_area" {
-			return false
-		}
-	} else {
-		return false
-	}
-	f.TagFilter.Filter(tags)
-	// always return true here since we found a matching type
-	return true
-}
-
-type elemFilter func(elem element.OSMElem) bool
-
-type TagMatcher struct {
-	mappings map[string]map[string][]string
-	tables   map[string]*TableFields
-	filters  map[string][]elemFilter
-}
-
-type Match struct {
-	Key         string
-	Value       string
-	Table       string
-	tableFields *TableFields
-}
-
-func (m *Match) Row(elem *element.OSMElem) []interface{} {
-	return m.tableFields.MakeRow(elem, *m)
-}
-
-func (tagMatcher *TagMatcher) Match(elem element.OSMElem) []Match {
-	tables := make(map[string]Match)
-
-	for k, v := range elem.Tags {
-		values, ok := tagMatcher.mappings[k]
-		if ok {
-			if tbls, ok := values["__any__"]; ok {
-				for _, t := range tbls {
-					tables[t] = Match{k, v, t, tagMatcher.tables[t]}
-				}
-				continue
-			} else if tbls, ok := values[v]; ok {
-				for _, t := range tbls {
-					tables[t] = Match{k, v, t, tagMatcher.tables[t]}
-				}
-				continue
-			}
-		}
-	}
-	var matches []Match
-	for t, match := range tables {
-		filters, ok := tagMatcher.filters[t]
-		filteredOut := false
-		if ok {
-			for _, filter := range filters {
-				if !filter(elem) {
-					filteredOut = true
-					break
-				}
-			}
-		}
-		if !filteredOut {
-			matches = append(matches, match)
-		}
-	}
-	return matches
-}
-
-func NewMapping(filename string) (*Mapping, error) {
-	f, err := os.Open(filename)
-	if err != nil {
-		return nil, err
-	}
-	decoder := json.NewDecoder(f)
-
-	mapping := Mapping{}
-	err = decoder.Decode(&mapping)
-	if err != nil {
-		return nil, err
-	}
-
-	mapping.prepare()
-	return &mapping, nil
-}
-
-func main() {
-	// 	data := `
-	// {
-	//     "tables": {
-	//         "roads": {
-	//             "mapping": {
-	//                 "highway": [
-	//                     "motorway",
-	//                     "motorway_link",
-	//                     "trunk",
-	//                     "trunk_link"
-	//                 ]
-	//             },
-	//             "fields": {
-	//                 "tunnel": {"type": "bool", "key": "tunnel"},
-	//                 "bridge": {"type": "bool"},
-	//                 "oneway": {"type": "direction"},
-	//                 "ref": {"type": "string"},
-	//                 "z_order": {"type": "wayzorder", "key": "NONE"}
-	//             }
-	//         }
-	//     }
-	// }
-	// `
-
-	// t := Table{map[string][]string{"highway": {"motorway", "trunk"}}}
-	// b, err := json.Marshal(t)
-	// if err != nil {
-	// 	log.Fatal(err)
-	// }
-	// log.Println(string(b))
-
-	flag.Parse()
-
-	mapping, err := NewMapping(flag.Arg(0))
-	if err != nil {
-		log.Fatal(err)
-	}
-	// log.Println(mapping.Mappings("point"))
-	// log.Println(mapping.ExtraTags("point"))
-	log.Println(mapping.NodeTagFilter())
-	log.Println(mapping.WayTagFilter())
-	log.Println(mapping.RelationTagFilter())
-
-	// log.Println(mapping)
-
-	// b, err := json.MarshalIndent(mapping, "", "   ")
-	// if err != nil {
-	// 	log.Fatal(err)
-	// }
-	// log.Println(string(b))
-}
diff --git a/mapping/fields.go b/mapping/fields.go
index e662b36..d3351d2 100644
--- a/mapping/fields.go
+++ b/mapping/fields.go
@@ -6,6 +6,23 @@ import (
 	"strconv"
 )
 
+var AvailableFieldTypes map[string]FieldType
+
+func init() {
+	AvailableFieldTypes = map[string]FieldType{
+		"bool":          {"bool", "bool", Bool},
+		"id":            {"id", "int64", Id},
+		"string":        {"string", "string", String},
+		"direction":     {"direction", "int8", Direction},
+		"integer":       {"integer", "int32", Integer},
+		"mapping_key":   {"mapping_key", "string", Key},
+		"mapping_value": {"mapping_value", "string", Value},
+		"geometry":      {"geometry", "geometry", Geometry},
+		"wayzorder":     {"wayzorder", "int32", WayZOrder},
+		"pseudoarea":    {"pseudoarea", "float32", PseudoArea},
+	}
+}
+
 type MakeValue func(string, *element.OSMElem, Match) interface{}
 
 type FieldSpec struct {
@@ -39,7 +56,7 @@ func (t *Table) TableFields() *TableFields {
 		field := FieldSpec{}
 		field.Name = mappingField.Name
 
-		fieldType, ok := FieldTypes[mappingField.Type]
+		fieldType, ok := AvailableFieldTypes[mappingField.Type]
 		if !ok {
 			log.Println("unhandled type:", mappingField.Type)
 		} else {
@@ -56,23 +73,6 @@ type FieldType struct {
 	Func   MakeValue
 }
 
-var FieldTypes map[string]FieldType
-
-func init() {
-	FieldTypes = map[string]FieldType{
-		"bool":          {"bool", "bool", Bool},
-		"id":            {"id", "int64", Id},
-		"string":        {"string", "string", String},
-		"direction":     {"direction", "int8", Direction},
-		"integer":       {"integer", "int32", Integer},
-		"mapping_key":   {"mapping_key", "string", Key},
-		"mapping_value": {"mapping_value", "string", Value},
-		"geometry":      {"geometry", "geometry", Geometry},
-		"wayzorder":     {"wayzorder", "int32", WayZOrder},
-		"pseudoarea":    {"pseudoarea", "float32", PseudoArea},
-	}
-}
-
 func Bool(val string, elem *element.OSMElem, match Match) interface{} {
 	if val == "" || val == "0" || val == "false" || val == "no" {
 		return false
diff --git a/mapping/filter.go b/mapping/filter.go
index 1aa9355..213953d 100644
--- a/mapping/filter.go
+++ b/mapping/filter.go
@@ -1,287 +1,77 @@
 package mapping
 
-type TagMap map[string]map[string]bool
+func (m *Mapping) NodeTagFilter() *TagFilter {
+	mappings := make(map[string]map[string][]string)
+	m.mappings("point", mappings)
+	tags := make(map[string]bool)
+	m.extraTags("point", tags)
+	return &TagFilter{mappings, tags}
+}
 
-var PointTags TagMap
-var WayTags TagMap
-var RelationTags TagMap
+func (m *Mapping) WayTagFilter() *TagFilter {
+	mappings := make(map[string]map[string][]string)
+	m.mappings("linestring", mappings)
+	m.mappings("polygon", mappings)
+	tags := make(map[string]bool)
+	m.extraTags("linestring", tags)
+	m.extraTags("polygon", tags)
+	return &TagFilter{mappings, tags}
+}
 
-// default mapping created from imposm defaultmapping.py
-// TODO make configurable
-func init() {
-	PointTags = TagMap{
-		"aeroway": map[string]bool{
-			"aerodome": true,
-			"gate":     true,
-			"helipad":  true,
-			"terminal": true,
-		},
-		"amenity": map[string]bool{
-			"fire_station": true,
-			"fuel":         true,
-			"hospital":     true,
-			"library":      true,
-			"police":       true,
-			"school":       true,
-			"townhall":     true,
-			"university":   true,
-		},
-		"highway": map[string]bool{
-			"bus_stop":          true,
-			"motorway_junction": true,
-			"turning_circle":    true,
-		},
-		"name": map[string]bool{
-			"__any__": true,
-		},
-		"place": map[string]bool{
-			"city":     true,
-			"country":  true,
-			"county":   true,
-			"hamlet":   true,
-			"locality": true,
-			"region":   true,
-			"state":    true,
-			"suburb":   true,
-			"town":     true,
-			"village":  true,
-		},
-		"population": map[string]bool{
-			"__any__": true,
-		},
-		"railway": map[string]bool{
-			"crossing":        true,
-			"halt":            true,
-			"level_crossing":  true,
-			"station":         true,
-			"subway_entrance": true,
-			"tram_stop":       true,
-		},
-		"ref": map[string]bool{
-			"__any__": true,
-		},
+func (m *Mapping) RelationTagFilter() *RelationTagFilter {
+	mappings := make(map[string]map[string][]string)
+	m.mappings("linestring", mappings)
+	m.mappings("polygon", mappings)
+	tags := make(map[string]bool)
+	m.extraTags("linestring", tags)
+	m.extraTags("polygon", tags)
+	tags["type"] = true // do not filter out type tag
+	return &RelationTagFilter{TagFilter{mappings, tags}}
+}
+
+type TagFilter struct {
+	mappings  map[string]map[string][]string
+	extraTags map[string]bool
+}
+
+type RelationTagFilter struct {
+	TagFilter
+}
+
+func (f *TagFilter) Filter(tags map[string]string) bool {
+	foundMapping := false
+	for k, v := range tags {
+		values, ok := f.mappings[k]
+		if ok {
+			if _, ok := values["__any__"]; ok {
+				foundMapping = true
+				continue
+			} else if _, ok := values[v]; ok {
+				foundMapping = true
+				continue
+			} else if _, ok := f.extraTags[k]; !ok {
+				delete(tags, k)
+			}
+		} else if _, ok := f.extraTags[k]; !ok {
+			delete(tags, k)
+		}
 	}
-	WayTags = map[string]map[string]bool{
-		"admin_level": map[string]bool{
-			"__any__": true,
-		},
-		"aeroway": map[string]bool{
-			"aerodrome": true,
-			"apron":     true,
-			"helipad":   true,
-			"runway":    true,
-			"taxiway":   true,
-			"terminal":  true,
-		},
-		"amenity": map[string]bool{
-			"cinema":           true,
-			"college":          true,
-			"fuel":             true,
-			"hospital":         true,
-			"library":          true,
-			"parking":          true,
-			"place_of_worship": true,
-			"school":           true,
-			"theatre":          true,
-			"university":       true,
-		},
-		"area": map[string]bool{
-			"__any__": true,
-		},
-		"boundary": map[string]bool{
-			"administrative": true,
-		},
-		"bridge": map[string]bool{
-			"__any__": true,
-		},
-		"building": map[string]bool{
-			"__any__": true,
-		},
-		"highway": map[string]bool{
-			"bridleway":      true,
-			"cycleway":       true,
-			"footway":        true,
-			"living_street":  true,
-			"motorway":       true,
-			"motorway_link":  true,
-			"path":           true,
-			"pedestrian":     true,
-			"primary":        true,
-			"primary_link":   true,
-			"residential":    true,
-			"road":           true,
-			"secondary":      true,
-			"secondary_link": true,
-			"service":        true,
-			"steps":          true,
-			"tertiary":       true,
-			"track":          true,
-			"trunk":          true,
-			"trunk_link":     true,
-			"unclassified":   true,
-		},
-		"landuse": map[string]bool{
-			"allotments":        true,
-			"basin":             true,
-			"cemetery":          true,
-			"commercial":        true,
-			"farm":              true,
-			"farmland":          true,
-			"farmyard":          true,
-			"forest":            true,
-			"grass":             true,
-			"industrial":        true,
-			"meadow":            true,
-			"park":              true,
-			"quarry":            true,
-			"railway":           true,
-			"recreation_ground": true,
-			"reservoir":         true,
-			"residential":       true,
-			"retail":            true,
-			"village_green":     true,
-			"wood":              true,
-		},
-		"leisure": map[string]bool{
-			"common":         true,
-			"garden":         true,
-			"golf_course":    true,
-			"nature_reserve": true,
-			"park":           true,
-			"pitch":          true,
-			"playground":     true,
-			"sports_centre":  true,
-			"stadium":        true,
-		},
-		"name": map[string]bool{
-			"__any__": true,
-		},
-		"natural": map[string]bool{
-			"land":  true,
-			"scrub": true,
-			"water": true,
-			"wood":  true,
-		},
-		"oneway": map[string]bool{
-			"__any__": true,
-		},
-		"railway": map[string]bool{
-			"funicular":    true,
-			"light_rail":   true,
-			"monorail":     true,
-			"narrow_gauge": true,
-			"preserved":    true,
-			"rail":         true,
-			"station":      true,
-			"subway":       true,
-			"tram":         true,
-		},
-		"ref": map[string]bool{
-			"__any__": true,
-		},
-		"tunnel": map[string]bool{
-			"__any__": true,
-		},
-		"waterway": map[string]bool{
-			"canal":     true,
-			"drain":     true,
-			"river":     true,
-			"riverbank": true,
-			"stream":    true,
-		}}
-
-	RelationTags = map[string]map[string]bool{
-
-		"admin_level": map[string]bool{
-			"__any__": true,
-		},
-		"aeroway": map[string]bool{
-			"aerodrome": true,
-			"apron":     true,
-			"helipad":   true,
-			"runway":    true,
-			"taxiway":   true,
-			"terminal":  true,
-		},
-		"amenity": map[string]bool{
-			"cinema":           true,
-			"college":          true,
-			"fuel":             true,
-			"hospital":         true,
-			"library":          true,
-			"parking":          true,
-			"place_of_worship": true,
-			"school":           true,
-			"theatre":          true,
-			"university":       true,
-		},
-		"area": map[string]bool{
-			"__any__": true,
-		},
-		"boundary": map[string]bool{
-			"administrative": true,
-		},
-		"bridge": map[string]bool{
-			"__any__": true,
-		},
-		"building": map[string]bool{
-			"__any__": true,
-		},
-		"highway": map[string]bool{
-			"bridleway":      true,
-			"cycleway":       true,
-			"footway":        true,
-			"living_street":  true,
-			"motorway":       true,
-			"motorway_link":  true,
-			"path":           true,
-			"pedestrian":     true,
-			"primary":        true,
-			"primary_link":   true,
-			"residential":    true,
-			"road":           true,
-			"secondary":      true,
-			"secondary_link": true,
-			"service":        true,
-			"steps":          true,
-			"tertiary":       true,
-			"track":          true,
-			"trunk":          true,
-			"trunk_link":     true,
-			"unclassified":   true,
-		},
-		"landuse": map[string]bool{
-			"allotments":        true,
-			"basin":             true,
-			"cemetery":          true,
-			"commercial":        true,
-			"farm":              true,
-			"farmland":          true,
-			"farmyard":          true,
-			"forest":            true,
-			"grass":             true,
-			"industrial":        true,
-			"meadow":            true,
-			"park":              true,
-			"quarry":            true,
-			"railway":           true,
-			"recreation_ground": true,
-			"reservoir":         true,
-			"residential":       true,
-			"retail":            true,
-			"village_green":     true,
-			"wood":              true,
-		},
-		"leisure": map[string]bool{
-			"common":         true,
-			"garden":         true,
-			"golf_course":    true,
-			"nature_reserve": true,
-			"park":           true,
-			"pitch":          true,
-			"playground":     true,
-			"sports_centre":  true,
-			"stadium":        true,
-		},
+	if foundMapping {
+		return true
+	} else {
+		return false
 	}
 }
+
+func (f *RelationTagFilter) Filter(tags map[string]string) bool {
+	if t, ok := tags["type"]; ok {
+		if t != "multipolygon" && t != "boundary" && t != "land_area" {
+			return false
+		}
+	} else {
+		return false
+	}
+	f.TagFilter.Filter(tags)
+	// always return true here since we found a matching type
+	return true
+}
diff --git a/mapping/matcher.go b/mapping/matcher.go
new file mode 100644
index 0000000..1cb7780
--- /dev/null
+++ b/mapping/matcher.go
@@ -0,0 +1,81 @@
+package mapping
+
+import (
+	"goposm/element"
+)
+
+func (m *Mapping) PointMatcher() *TagMatcher {
+	mappings := make(TagTables)
+	m.mappings("point", mappings)
+	filters := m.ElementFilters()
+	return &TagMatcher{mappings, m.tables("point"), filters}
+}
+
+func (m *Mapping) LineStringMatcher() *TagMatcher {
+	mappings := make(TagTables)
+	m.mappings("linestring", mappings)
+	filters := m.ElementFilters()
+	return &TagMatcher{mappings, m.tables("linestring"), filters}
+}
+
+func (m *Mapping) PolygonMatcher() *TagMatcher {
+	mappings := make(TagTables)
+	m.mappings("polygon", mappings)
+	filters := m.ElementFilters()
+	return &TagMatcher{mappings, m.tables("polygon"), filters}
+}
+
+type TagMatcher struct {
+	mappings TagTables
+	tables   map[string]*TableFields
+	filters  map[string][]ElementFilter
+}
+
+type Match struct {
+	Key         string
+	Value       string
+	Table       string
+	tableFields *TableFields
+}
+
+func (m *Match) Row(elem *element.OSMElem) []interface{} {
+	return m.tableFields.MakeRow(elem, *m)
+}
+
+func (tagMatcher *TagMatcher) Match(elem element.OSMElem) []Match {
+	tables := make(map[string]Match)
+
+	for k, v := range elem.Tags {
+		values, ok := tagMatcher.mappings[k]
+		if ok {
+			if tbls, ok := values["__any__"]; ok {
+				for _, t := range tbls {
+					tables[t] = Match{k, v, t, tagMatcher.tables[t]}
+				}
+				continue
+			} else if tbls, ok := values[v]; ok {
+				for _, t := range tbls {
+					tables[t] = Match{k, v, t, tagMatcher.tables[t]}
+				}
+				continue
+			}
+		}
+	}
+	var matches []Match
+	for t, match := range tables {
+		filters, ok := tagMatcher.filters[t]
+		filteredOut := false
+		if ok {
+			for _, filter := range filters {
+				if !filter(elem) {
+					filteredOut = true
+					break
+				}
+			}
+		}
+		if !filteredOut {
+			matches = append(matches, match)
+		}
+	}
+	return matches
+}