diff --git a/errors.go b/errors.go
new file mode 100644
index 0000000..332f8cf
--- /dev/null
+++ b/errors.go
@@ -0,0 +1,9 @@
+package model
+
+import "git.milar.in/milarin/adverr"
+
+var (
+	ErrFeatureAlreadyCreated = adverr.NewErrTmpl("ErrFeatureAlreadyCreated", "duplicate feature: '%s'")
+	ErrFeatureWithoutValue   = adverr.NewErrTmpl("ErrFeatureWithoutValue", "feature needs a value: '%s'")
+	ErrInvalidFeatureValue   = adverr.NewErrTmpl("ErrInvalidFeatureValue", "feature needs a value of type %s")
+)
diff --git a/feature.go b/feature.go
new file mode 100644
index 0000000..3125e27
--- /dev/null
+++ b/feature.go
@@ -0,0 +1,207 @@
+package model
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type Feature[T any] struct {
+	name      string
+	value     T
+	priority  int
+	essential bool
+}
+
+var (
+	Feature1080p = &Feature[bool]{
+		name:  "1080p",
+		value: true,
+	}
+	Feature720p = &Feature[bool]{
+		name:  "720p",
+		value: true,
+	}
+	FeatureTrusted = &Feature[bool]{
+		name:  "trusted",
+		value: true,
+	}
+)
+
+var (
+	featureLangOther = Feature[string]{
+		name:  "lang",
+		value: "_",
+	}
+	featureSubOther = Feature[string]{
+		name:  "sub",
+		value: "_",
+	}
+)
+
+func PrintAllFeatures() {
+	fmt.Printf("string features: %#v\n", stringFeatures)
+	fmt.Printf("bool features: %#v\n", boolFeatures)
+}
+
+var (
+	// string features are user-defined. 'primary key' is name and value
+	stringFeatures = []*Feature[string]{}
+
+	// bool features are known at compile time. 'primary key' is value only
+	boolFeatures = []*Feature[bool]{Feature1080p, Feature720p, FeatureTrusted}
+)
+
+func makeStringFeature(name, value string, priority int, essential bool) *Feature[string] {
+	for _, feature := range stringFeatures {
+		if feature.name == name && feature.value == value {
+			panic(ErrFeatureAlreadyCreated.New(fmt.Sprintf("%s:%s", name, value)))
+		}
+	}
+
+	feature := &Feature[string]{
+		name:      name,
+		value:     value,
+		priority:  priority,
+		essential: essential,
+	}
+
+	stringFeatures = append(stringFeatures, feature)
+	return feature
+}
+
+func GetStringFeature(name, value string) *Feature[string] {
+	for _, feature := range stringFeatures {
+		if feature.name == name && feature.value == value {
+			return feature
+		}
+	}
+
+	// lang and sub features have their special '_' value
+	if name == "lang" {
+		return makeStringFeature(name, value, featureLangOther.priority, featureLangOther.essential)
+	} else if name == "sub" {
+		return makeStringFeature(name, value, featureSubOther.priority, featureSubOther.essential)
+	}
+
+	panic("TODO")
+}
+
+func GetBoolFeature(name string, value bool) *Feature[bool] {
+	for _, feature := range boolFeatures {
+		if feature.name == name {
+			return feature
+		}
+	}
+
+	panic("TODO")
+}
+
+func ParseEssentialFeatures(essentialFeatureString string) {
+	featureSpecs := strings.Split(essentialFeatureString, ",")
+
+	for _, featureSpec := range featureSpecs {
+		handleFeatureSpec(featureSpec, -1, true)
+	}
+}
+
+func handleFeatureSpec(featureSpec string, priority int, essential bool) {
+	data := strings.Split(featureSpec, ":")
+	name := data[0]
+
+	if name == "lang" || name == "sub" {
+		if len(data) < 2 {
+			panic(ErrFeatureWithoutValue.New(featureSpec))
+		}
+		value := data[1]
+
+		makeStringFeature(name, value, priority, essential)
+		return
+	}
+
+	value := ""
+	if len(data) >= 2 {
+		value = data[1]
+	}
+
+	var err error
+
+	switch name {
+
+	case "1080p":
+		{
+			Feature1080p.value, err = strconv.ParseBool(value)
+			if err != nil {
+				panic(ErrInvalidFeatureValue.New("bool"))
+			}
+			Feature1080p.priority = priority
+			Feature1080p.essential = essential
+		}
+
+	case "720p":
+		{
+			Feature720p.value, err = strconv.ParseBool(value)
+			if err != nil {
+				panic(ErrInvalidFeatureValue.New("bool"))
+			}
+			Feature720p.priority = priority
+			Feature720p.essential = essential
+		}
+
+	case "trusted":
+		{
+			FeatureTrusted.value, err = strconv.ParseBool(value)
+			if err != nil {
+				panic(ErrInvalidFeatureValue.New("bool"))
+			}
+			FeatureTrusted.priority = priority
+			FeatureTrusted.essential = essential
+		}
+
+	}
+}
+
+/*
+examples for feature priorization:
+
+# if multiple torrents are available, the torrent with most features of this list will be prioritized.
+# when a new torrent with more features is uploaded, it will replace the files of the old torrent.
+# that ensures availability of latest episodes but highest preferred quality on the long run
+#
+# This list is ordered by the separator '|'. Features within the same '|' block (separated by comma) get same priority.
+# the first '|' block is prioritized highest.
+#
+# '_'  is a placeholder for all other features not directly mentioned in the list.
+# It can be used for a default priority. If not default priority is given, it will be set to 0.
+#
+# This example basically means:
+# torrents with japanese language have priority 3
+# torrents with english or german languages or subtitles in english or german have priority 2
+# torrents with any other languages or subtitles will have priority 1
+TORRENT_PRIORITIZED_FEATURES="sub:ja|lang:en,sub:en,lang:de,sub:de|lang:_,sub:_"
+
+# torrents without these features will never be downloaded ('_' features not supported)-
+#
+# essential features will be parsed before prioritized features.
+# a feature cannot be both essential and prioritized.
+#
+# This example basically means: Only download torrents with japanese language and subtitles
+TORRENT_ESSENTIAL_FEATURES="lang:ja,1080p"
+
+# complete feature list:
+# "lang:<lang_code>": language (audio)
+# "sub:<lang_code>": subtitles
+# "1080p[:<bool>]": full hd resolution with optional bool flag
+# "720p[:<bool>]": hd resolution
+# "trusted[:<bool>]": trusted torrent uploader (highlighted in green on nyaa.si)
+
+TODO: add feature min-seeders:<int_amount>
+TODO: add feature max-seeders:<int_amount>
+TODO: add feature min-leechers:<int_amount>
+TODO: add feature max-leechers:<int_amount>
+TODO: add feature min-downloads:<int_amount>
+TODO: add feature max-downloads:<int_amount>
+TODO: add feature min-upload-time:<datetime>
+TODO: add feature max-upload-time:<datetime>
+
+*/
diff --git a/go.mod b/go.mod
index da45494..153402b 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,7 @@ module git.milar.in/animan/model
 
 go 1.18
 
-require git.milar.in/milarin/anilist v1.4.1
+require (
+	git.milar.in/milarin/adverr v0.2.1
+	git.milar.in/milarin/anilist v1.4.1
+)
diff --git a/go.sum b/go.sum
index cb2e815..ab76918 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,4 @@
+git.milar.in/milarin/adverr v0.2.1 h1:eyXFGC+Ui/kcNt2+NqP3HiAplwxzqeNr9DfitsUb3c4=
+git.milar.in/milarin/adverr v0.2.1/go.mod h1:wwfglcey4R3vqjNL/d8mbnvFJGzETRXzAEolIHZY32w=
 git.milar.in/milarin/anilist v1.4.1 h1:XxpKZ3CZiwKf7tUW2z+OMktWt/fLKMd8xAGPr+eodQE=
-git.milar.in/milarin/anilist v1.4.1/go.mod h1:8PTHXFMA45JpfRFIpcdrKwDHue8fbT/wwV1BuHFn6c0=
\ No newline at end of file
+git.milar.in/milarin/anilist v1.4.1/go.mod h1:8PTHXFMA45JpfRFIpcdrKwDHue8fbT/wwV1BuHFn6c0=