diff --git a/htmlcheck/checker.go b/htmlcheck/checker.go
index dc497da..6ee15b4 100644
--- a/htmlcheck/checker.go
+++ b/htmlcheck/checker.go
@@ -9,6 +9,8 @@
 // The htmlcheck package contains the HTML Checker.
 package htmlcheck
 
+import "net/url"
+
 // HTMLChecker is a component that checks HTML and reformats it as needed.
 type HTMLChecker interface {
 	Append(string) error
@@ -18,9 +20,10 @@ type HTMLChecker interface {
 	Length() (int, error)
 	Lines() (int, error)
 	Counter(string) (int, error)
-	Context() map[string]any
-	ExternalRefs() ([]any, error)
-	InternalRefs() ([]any, error)
+	GetContext(string) any
+	SetContext(string, any)
+	ExternalRefs() ([]*url.URL, error)
+	InternalRefs() ([]string, error)
 }
 
 // var NotYetFinished = errors.New("the HTML checker has not yet been finished")
diff --git a/htmlcheck/checker_config.go b/htmlcheck/checker_config.go
new file mode 100644
index 0000000..d2ad6ce
--- /dev/null
+++ b/htmlcheck/checker_config.go
@@ -0,0 +1,102 @@
+/*
+ * Amsterdam Web Communities System
+ * Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+// The htmlcheck package contains the HTML Checker.
+package htmlcheck
+
+import (
+	_ "embed"
+
+	log "github.com/sirupsen/logrus"
+	"gopkg.in/yaml.v3"
+)
+
+// HTMLCheckerConfig is a configuration that may be used with the HTML Checker.
+type HTMLCheckerConfig struct {
+	Name            string   `yaml:"name"`
+	WordWrap        int      `yaml:"wordWrap"`
+	Rewrap          bool     `yaml:"rewrap"`
+	Angles          bool     `yaml:"angles"`
+	Parens          bool     `yaml:"parens"`
+	DiscardHTML     bool     `yaml:"discardHTML"`
+	DiscardRejected bool     `yaml:"discardRejected"`
+	DiscardComments bool     `yaml:"discardComments"`
+	DiscardXML      bool     `yaml:"discardXML"`
+	OutputFilters   []string `yaml:"outputFilters"`
+	StringRewriters []string `yaml:"stringRewriters"`
+	WordRewriters   []string `yaml:"wordRewriters"`
+	TagRewriters    []string `yaml:"tagRewriters"`
+	ParenRewriters  []string `yaml:"parenRewriters"`
+	TagSet          string   `yaml:"tagSet"`
+	DisallowTags    []string `yaml:"disallowTags"`
+}
+
+func (cfg *HTMLCheckerConfig) rezOutputFilters() []outputFilter {
+	rc := make([]outputFilter, 0, len(cfg.OutputFilters))
+	for i := range cfg.OutputFilters {
+		f, ok := outputFilterRegistry[cfg.OutputFilters[i]]
+		if ok {
+			rc = append(rc, f)
+		} else {
+			log.Errorf("filter %s is not found", cfg.OutputFilters[i])
+		}
+	}
+	return rc
+}
+
+func rezRewriters(desired []string) []rewriter {
+	rc := make([]rewriter, 0, len(desired))
+	for i := range desired {
+		r, ok := rewriterRegistry[desired[i]]
+		if ok {
+			rc = append(rc, r)
+		} else {
+			log.Errorf("rewriter %s is not found", desired[i])
+		}
+	}
+	return rc
+}
+
+func (cfg *HTMLCheckerConfig) rezStringRewriters() []rewriter {
+	return rezRewriters(cfg.StringRewriters)
+}
+
+func (cfg *HTMLCheckerConfig) rezWordRewriters() []rewriter {
+	return rezRewriters(cfg.WordRewriters)
+}
+
+func (cfg *HTMLCheckerConfig) rezTagRewriters() []rewriter {
+	return rezRewriters(cfg.TagRewriters)
+}
+
+func (cfg *HTMLCheckerConfig) rezParenRewriters() []rewriter {
+	return rezRewriters(cfg.ParenRewriters)
+}
+
+// HTMLCheckerConfigFile represents all the configs as they exist in the file.
+type HTMLCheckerConfigFile struct {
+	Configs []HTMLCheckerConfig `yaml:"configs"`
+}
+
+//go:embed configs.yaml
+var configData []byte
+
+// configsRegistry contains all the known configurations by name.
+var configsRegistry = make(map[string]*HTMLCheckerConfig)
+
+// init loads the configuration data.
+func init() {
+	var cfgdata HTMLCheckerConfigFile
+	err := yaml.Unmarshal(configData, &cfgdata)
+	if err != nil {
+		panic(err)
+	}
+	for i := range cfgdata.Configs {
+		configsRegistry[cfgdata.Configs[i].Name] = &(cfgdata.Configs[i])
+	}
+}