diff --git a/edufeed.md b/edufeed.md
index e787bd2..6a284ef 100644
--- a/edufeed.md
+++ b/edufeed.md
@@ -59,9 +59,8 @@ This is how we convert each property of the AMB:
 - `description` → `["description", <value>]`
 - `about` (array of concept objects) → Repeat for each:
   - `["about:id", <uri>]`
-  - `["about:prefLabel", <label>]`
+  - `["about:prefLabel:lang", <label>]`
   - `["about:type", "Concept"]`
-  - `["about:inLanguage", <language>]` (if applicable)
 - `keywords` → `["t", <keyword>]` (repeat for each keyword, using Nostr `t` tag)
 - `inLanguage` → `["inLanguage", <languageCode>]` (repeat for each language)
 - `image` → `["image", <uri>]`
@@ -106,41 +105,36 @@ This is how we convert each property of the AMB:
   - `["license:id", <license_uri>]`
 - `conditionsOfAccess` (Concept object) →
   - `["conditionsOfAccess:id", <uri>]`
-  - `["conditionsOfAccess:prefLabel", <label>]` (optional)
+  - `["conditionsOfAccess:prefLabel:lang", <label>]` (optional)
   - `["conditionsOfAccess:type", "Concept"]` (optional)
-  - `["conditionsOfAccess:inLanguage", <language>]` (optional)
 
 **Educational:**
 
 - `learningResourceType` (array of Concept objects) → Repeat for each:
   - `["learningResourceType:id", <uri>]`
-  - `["learningResourceType:prefLabel", <label>]` (optional)
+  - `["learningResourceType:prefLabel:lang", <label>]` (optional)
   - `["learningResourceType:type", "Concept"]` (optional)
-  - `["learningResourceType:inLanguage", <language>]` (optional)
 - `audience` (array of Concept objects) → Repeat for each:
   - `["audience:id", <uri>]`
-  - `["audience:prefLabel", <label>]` (optional)
+  - `["audience:prefLabel:lang", <label>]` (optional)
   - `["audience:type", "Concept"]` (optional)
-  - `["audience:inLanguage", <language>]` (optional)
 - `teaches` (array of Concept objects) → Repeat for each:
   - `["teaches:id", <uri>]`
-  - `["teaches:prefLabel", <label>]` (optional)
+  - `["teaches:prefLabel:lang", <label>]` (optional)
 - `assesses` (array of Concept objects) → Repeat for each:
   - `["assesses:id", <uri>]`
-  - `["assesses:prefLabel", <label>]` (optional)
+  - `["assesses:prefLabel:lang", <label>]` (optional)
 - `competencyRequired` (array of Concept objects) → Repeat for each:
   - `["competencyRequired:id", <uri>]`
-  - `["competencyRequired:prefLabel", <label>]` (optional)
+  - `["competencyRequired:prefLabel:lang", <label>]` (optional)
 - `educationalLevel` (array of Concept objects) → Repeat for each:
   - `["educationalLevel:id", <uri>]`
-  - `["educationalLevel:prefLabel", <label>]` (optional)
+  - `["educationalLevel:prefLabel:lang", <label>]` (optional)
   - `["educationalLevel:type", "Concept"]` (optional)
-  - `["educationalLevel:inLanguage", <language>]` (optional)
 - `interactivityType` (Concept object) →
   - `["interactivityType:id", <uri>]`
-  - `["interactivityType:prefLabel", <label>]` (optional)
+  - `["interactivityType:prefLabel:lang", <label>]` (optional)
   - `["interactivityType:type", "Concept"]` (optional)
-  - `["interactivityType:inLanguage", <language>]` (optional)
 
 **Relations:**
 
@@ -190,218 +184,6 @@ This is how we convert each property of the AMB:
   - `["caption:encodingFormat", <format>]` (optional, IANA media type)
   - `["caption:inLanguage", <languageCode>]` (optional)
 
-## Conversion Guidelines
-
-### AMB → Nostr Event (JavaScript)
-
-```javascript
-function flattenAMBToNostrTags(ambData) {
-  const tags = [];
-  
-  function addTag(key, value) {
-    if (value !== null && value !== undefined && value !== '') {
-      tags.push([key, String(value)]);
-    }
-  }
-  
-  function flattenObject(obj, prefix = '') {
-    for (const [key, value] of Object.entries(obj)) {
-      const fullKey = prefix ? `${prefix}:${key}` : key;
-      
-      // Special case: id maps to 'd' tag
-      if (key === 'id' && !prefix) {
-        addTag('d', value);
-        continue;
-      }
-      
-      // Special case: keywords map to 't' tags (Nostr-native)
-      if (key === 'keywords' && !prefix && Array.isArray(value)) {
-        value.forEach(keyword => {
-          addTag('t', keyword);
-        });
-        continue;
-      }
-      
-      if (Array.isArray(value)) {
-        // Arrays: repeat the same key for each element
-        value.forEach(item => {
-          if (typeof item === 'object' && item !== null) {
-            flattenObject(item, fullKey);
-          } else {
-            addTag(fullKey, item);
-          }
-        });
-      } else if (typeof value === 'object' && value !== null) {
-        // Nested objects: flatten recursively
-        flattenObject(value, fullKey);
-      } else {
-        // Simple values
-        addTag(fullKey, value);
-      }
-    }
-  }
-  
-  flattenObject(ambData);
-  return tags;
-}
-
-// Example usage:
-const ambMetadata = {
-  id: "https://example.org/resource/123",
-  name: "Introduction to Physics",
-  creator: [
-    {
-      name: "Dr. Jane Smith",
-      type: "Person",
-      affiliation: {
-        name: "MIT",
-        type: "Organization"
-      }
-    }
-  ],
-  keywords: ["Physics", "Education"]
-};
-
-const tags = flattenAMBToNostrTags(ambMetadata);
-// Result (using Nostr-native conventions):
-// [
-//   ["d", "https://example.org/resource/123"],
-//   ["name", "Introduction to Physics"],
-//   ["creator:name", "Dr. Jane Smith"],
-//   ["creator:type", "Person"],
-//   ["creator:affiliation:name", "MIT"],
-//   ["creator:affiliation:type", "Organization"],
-//   ["t", "Physics"],
-//   ["t", "Education"]
-// ]
-//
-// Note: If creator had Nostr identity, would also include:
-// ["p", "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798", "wss://relay.example.com", "creator"]
-```
-
-### Nostr Event → AMB Metadata (JavaScript)
-
-```javascript
-function unflattenNostrTagsToAMB(tags) {
-  const result = {};
-  
-  // Group tags by their key
-  const tagGroups = {};
-  const pTags = [];  // Collect p tags separately
-  
-  tags.forEach(([key, ...values]) => {
-    // Special case: 'd' tag maps to 'id'
-    if (key === 'd') {
-      result.id = values[0];
-      return;
-    }
-    
-    // Special case: 'p' tags with 'creator' marker map to creator.id
-    if (key === 'p') {
-      const [pubkey, relay, marker] = values;
-      if (marker === 'creator' || marker === 'contributor') {
-        pTags.push({ pubkey, relay, marker });
-      }
-      return;
-    }
-    
-    // Special case: 't' tags map to 'keywords'
-    if (key === 't') {
-      if (!result.keywords) {
-        result.keywords = [];
-      }
-      result.keywords.push(values[0]);
-      return;
-    }
-    
-    if (!tagGroups[key]) {
-      tagGroups[key] = [];
-    }
-    tagGroups[key].push(values);
-  });
-  
-  // Process p tags (creator/contributor)
-  if (pTags.length > 0) {
-    result.creator = pTags.map(({ pubkey }) => ({
-      id: pubkey
-    }));
-  }
-  
-  // Process each tag group
-  for (const [key, valuesList] of Object.entries(tagGroups)) {
-    const parts = key.split(':');
-    
-    // Multiple occurrences of same key = array
-    if (valuesList.length > 1) {
-      // Check if this is an object array (has nested properties)
-      const hasNestedProps = Object.keys(tagGroups).some(k => 
-        k.startsWith(key + ':')
-      );
-      
-      if (hasNestedProps) {
-        // Array of objects - reconstruct each object
-        const arrayResult = [];
-        valuesList.forEach(values => {
-          const obj = {};
-          setNestedValue(obj, parts, values[0]);
-          arrayResult.push(obj);
-        });
-        setNestedValue(result, parts, arrayResult);
-      } else {
-        // Simple array
-        setNestedValue(result, parts, valuesList.map(v => v[0]));
-      }
-    } else {
-      // Single occurrence
-      setNestedValue(result, parts, valuesList[0][0]);
-    }
-  }
-  
-  return result;
-}
-
-function setNestedValue(obj, parts, value) {
-  const lastPart = parts[parts.length - 1];
-  let current = obj;
-  
-  for (let i = 0; i < parts.length - 1; i++) {
-    if (!current[parts[i]]) {
-      current[parts[i]] = {};
-    }
-    current = current[parts[i]];
-  }
-  
-  current[lastPart] = value;
-}
-
-// Example usage:
-const nostrTags = [
-  ["d", "https://example.org/resource/123"],
-  ["name", "Introduction to Physics"],
-  ["p", "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798", "wss://relay.example.com", "creator"],
-  ["creator:affiliation:name", "MIT"],
-  ["creator:affiliation:type", "Organization"],
-  ["t", "Physics"],
-  ["t", "Education"]
-];
-
-const ambMetadata = unflattenNostrTagsToAMB(nostrTags);
-// Result:
-// {
-//   id: "https://example.org/resource/123",
-//   name: "Introduction to Physics",
-//   creator: {
-//     // Note: p tag is decoded to get the pubkey
-//     id: "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
-//     affiliation: {
-//       name: "MIT",
-//       type: "Organization"
-//     }
-//   },
-//   keywords: ["Physics", "Education"]
-// }
-```
-
 ## How to convert an AMB nostr-event to AMB metadata
 
 To convert a Nostr event back to AMB metadata:
@@ -416,93 +198,6 @@ To convert a Nostr event back to AMB metadata:
    - Convert string booleans to actual booleans
    - Parse ISO8601 dates if needed for validation
 
-### Reconstruction Algorithm
-
-```javascript
-function reconstructAMB(nostrEvent) {
-  const amb = {
-    "@context": [
-      "https://w3id.org/kim/amb/context.jsonld",
-      { "@language": "de" }
-    ],
-    type: ["LearningResource"]
-  };
-  
-  // Group tags by their base key (before first ':')
-  const tagsByBase = {};
-  nostrEvent.tags.forEach(tag => {
-    const [key, ...values] = tag;
-    const baseKey = key.split(':')[0];
-    
-    if (!tagsByBase[baseKey]) {
-      tagsByBase[baseKey] = [];
-    }
-    tagsByBase[baseKey].push({ fullKey: key, values });
-  });
-  
-  // Reconstruct each property
-  for (const [baseKey, tags] of Object.entries(tagsByBase)) {
-    if (baseKey === 'd') {
-      amb.id = tags[0].values[0];
-      continue;
-    }
-    
-    // Check if this is a simple property or nested
-    const hasNested = tags.some(t => t.fullKey.includes(':'));
-    
-    if (!hasNested) {
-      // Simple property
-      if (tags.length === 1) {
-        amb[baseKey] = tags[0].values[0];
-      } else {
-        // Multiple values = array
-        amb[baseKey] = tags.map(t => t.values[0]);
-      }
-    } else {
-      // Nested property - group by instance
-      amb[baseKey] = reconstructNestedProperty(tags);
-    }
-  }
-  
-  return amb;
-}
-
-function reconstructNestedProperty(tags) {
-  // Group tags that belong to the same array instance
-  const instances = [];
-  let currentInstance = {};
-  let lastDepth = 0;
-  
-  tags.forEach(tag => {
-    const parts = tag.fullKey.split(':');
-    const depth = parts.length;
-    
-    // If depth decreased, we're starting a new instance
-    if (depth <= lastDepth && Object.keys(currentInstance).length > 0) {
-      instances.push(currentInstance);
-      currentInstance = {};
-    }
-    
-    // Build nested structure
-    let current = currentInstance;
-    for (let i = 1; i < parts.length - 1; i++) {
-      if (!current[parts[i]]) {
-        current[parts[i]] = {};
-      }
-      current = current[parts[i]];
-    }
-    current[parts[parts.length - 1]] = tag.values[0];
-    
-    lastDepth = depth;
-  });
-  
-  if (Object.keys(currentInstance).length > 0) {
-    instances.push(currentInstance);
-  }
-  
-  return instances.length === 1 ? instances[0] : instances;
-}
-```
 
 ## How to query for AMB nostr-events in supporting relays
 
@@ -532,17 +227,14 @@ Query capabilities should include:
     ["name", "Pythagorean Theorem Video"],
     ["description", "An introductory video explaining the Pythagorean theorem"],
     ["about:id", "http://w3id.org/kim/schulfaecher/s1017"],
-    ["about:prefLabel", "Mathematik"],
+    ["about:prefLabel:de", "Mathematik"],
     ["about:type", "Concept"],
-    ["about:inLanguage", "de"],
     ["about:id", "http://w3id.org/kim/schulfaecher/s1005"],
-    ["about:prefLabel", "Deutsch"],
+    ["about:prefLabel:de", "Deutsch"],
     ["about:type", "Concept"],
-    ["about:inLanguage", "de"],
     ["learningResourceType:id", "http://w3id.org/openeduhub/vocabs/new_lrt/7a6e9608-2554-4981-95dc-47ab9ba924de"],
-    ["learningResourceType:prefLabel", "Video"],
+    ["learningResourceType:prefLabel:de", "Video"],
     ["learningResourceType:type", "Concept"],
-    ["learningResourceType:inLanguage", "de"],
     ["t", "Pythagoras"],
     ["t", "Geometrie"],
     ["t", "Mathematik"],
@@ -587,15 +279,15 @@ Query capabilities should include:
     ["dateCreated", "2024-01-15"],
     ["datePublished", "2024-02-01"],
     ["about:id", "https://w3id.org/kim/hochschulfaechersystematik/n079"],
-    ["about:prefLabel", "Informatik"],
+    ["about:prefLabel:de", "Informatik"],
     ["about:type", "Concept"],
     ["learningResourceType:id", "https://w3id.org/kim/hcrt/course"],
-    ["learningResourceType:prefLabel", "Course"],
+    ["learningResourceType:prefLabel:de", "Kurs"],
     ["audience:id", "http://purl.org/dcx/lrmi-vocabs/educationalAudienceRole/student"],
-    ["audience:prefLabel", "student"],
+    ["audience:prefLabel:de", "Student"],
     ["audience:type", "Concept"],
     ["educationalLevel:id", "https://w3id.org/kim/educationalLevel/level_06"],
-    ["educationalLevel:prefLabel", "Bachelor or equivalent"],
+    ["educationalLevel:prefLabel:en", "Bachelor or equivalent"],
     ["inLanguage", "en"],
     ["license:id", "https://creativecommons.org/licenses/by-sa/4.0/"],
     ["isAccessibleForFree", "true"]
@@ -607,17 +299,6 @@ Query capabilities should include:
 
 ## Tools
 
-### Decoding Nostr Identifiers with njump
-
-[`njump`](https://njump.me/) is a helpful tool for decoding and navigating Nostr identifiers, particularly useful when working with `p` tags (pubkeys) and `a` tags (addressable events):
-
-- **For `p` tag pubkeys**: Paste the hex pubkey or npub identifier at `https://njump.me/<pubkey-or-npub>` to view the profile and see all resources published by that user
-  - Example: `https://njump.me/79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798`
-  - Or: `https://njump.me/npub1...`
-
-- **For `a` tag addressable events**: Use `https://njump.me/naddr1...` to view the specific event
-  - Example: `https://njump.me/naddr1qqqgcjsyup9qqqg6cjv` to navigate to an addressable resource
-
 ### Using `nak` to create AMB events
 
 You can use [`nak`](https://github.com/fiatjaf/nak) to create AMB events with the flattened tag structure:
@@ -631,9 +312,8 @@ nak event \
   --tag name="Pythagorean Theorem Video" \
   --tag description="An introductory video" \
   --tag about:id="http://w3id.org/kim/schulfaecher/s1017" \
-  --tag about:prefLabel="Mathematik" \
+  --tag about:prefLabel:de="Mathematik" \
   --tag about:type="Concept" \
-  --tag about:inLanguage="de" \
   --tag t="Pythagoras" \
   --tag t="Geometrie" \
   --tag inLanguage="de" \
@@ -648,13 +328,6 @@ nak event \
   --tag creator:affiliation:name="MIT" \
   --tag creator:affiliation:type="Organization"
 
-# Example 3: Resource with relation to another AMB event (using a tag)
-nak event \
-  --kind 30142 \
-  --tag d="https://example.org/resource/789" \
-  --tag name="Physics Module Part 1" \
-  --tag a="30142:79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798:physics-course;wss://relay.example.com;isPartOf"
-```
 
 ## References