feat: adjust to changes in the content key

content/page/text-api-specs.md

@@ -134,8 +134,7 @@ The `type` MUST be `page`.
 | lang | 1 | [iso639-3] | language codes describing the resource |
 | langAlt | ? | [string] | alternative language code (when there is no iso639-3 code, e.g. `karshuni`) |
 | x-langString | 1 | string | a string listing all languages appearing in the document with their full English name (e.g. "Arabic, Karshuni") |
-| content | 1 | URL | URL pointing to the content |
-| content-type | 1 | string | a MIME type, in this case `application/xhtml+xml` |
+| content | 1 | \[[Content Object](#content-object)\] | different serializations of the item, e.g. HTML, plain text, XML, … |
 | image | ? | [Image Object](#image-object) | corresponding image as given in `tei:pb/@facs` |
 | annotationCollection | *1* | URI | URI pointing to an [Annotation Collection](https://www.w3.org/TR/annotation-model/#annotation-collection) for this item |
 
@@ -150,7 +149,15 @@ The `type` MUST be `page`.
 | id | ? | string | internal identifier |
 | idref | * | [Idref Object](#idref-object) | authority files related to the person |
 
-#### Metadata Object
+### Content Object
+
+| Field Name | Cardinality | Type | Description |
+|----|----|----|----|
+| url | 1 | URL | URL pointing to the content |
+| type | 1 | string | a MIME type. If several Content Objects with the same MIME type are provided, these SHOULD be distinguished with a [MIME type parameter](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#structure_of_a_mime_type) where the key is `type` and the value can be freely chosen, e.g. `text/html;type=transcription`.
+ |
+
+### Metadata Object
 
 A set of metadata describing the source or its context.
 Mainly used for key-value pairs.
@@ -218,12 +225,13 @@ Within a manifest it SHOULD contain items exclusively.
 | 1.1.0 | 2020-08-25 | add more metadata for manifests/editions (`x-editor`, `x-date`, `x-origin`, `x-location`)|
 | 1.1.1 | 2021-01-18 | update examples concerning Title Object |
 | 1.2.0 | 2021-02-04 | move extensions to Metadata Object |
+| 2.0.0 | 2021-02-18 | add Content Object for providing several serializations |
 
 ## Appendix
 
 ### Class Diagram
 
-![UML class diagram](http://yuml.me/c315bafe.png)
+![UML class diagram](https://yuml.me/74c71968.svg)
 
 ```yuml
 // Ahiqar TextAPI
@@ -234,7 +242,7 @@ Within a manifest it SHOULD contain items exclusively.
 
 [Manifest|entrypoint| -textapi 1; -id 1; -label 1; -metadata 1; -license 1; -annotationCollection 1 {bg:yellow}]
 
-[Item| -textapi 1; -type 1; -n 1; -lang 1; -langAlt ?; -content 1; -content-type 1; -image ?; -annotationCollection 1]
+[Item| -textapi 1; -type 1; -n 1; -lang 1; -langAlt ?; -content 1; -image ?; -annotationCollection 1]
 
 // objects
 [Sequence|-id; -type]
@@ -243,11 +251,13 @@ Within a manifest it SHOULD contain items exclusively.
 
 [Image| -id; -manifest]
 
-[License| -id 1; -notes ?]
+[License| -id; -notes ?]
+
+[Title| -title; -type]
 
-[Title| -title 1; -type 1]
+[Idref| -base ?; -type| -id]
 
-[Idref| -base ?; -type 1| -id 1]
+[Content| -url; -type]
 
 // imports
 [Collection]-[Title]
@@ -261,6 +271,7 @@ Within a manifest it SHOULD contain items exclusively.
 
 [Item]-[Title]
 [Item]-[Image]
+[Item]-[Content]
 
 [Actor]-[Idref]
 
@@ -367,8 +378,16 @@ Within a manifest it SHOULD contain items exclusively.
   },
   "type": "page",
   "n": "140",
-  "content": "https://ahikar.sub.uni-goettingen.de/api/content/3r1gh/140.html",
-  "content-type": "application/xhtml+xml",
+  "content": [
+    {
+      "url": "https://ahikar.sub.uni-goettingen.de/api/content/3r1gh/140.html",
+      "type": "application/xhtml+xml;type=transcription"
+    },
+    {
+      "url": "https://ahikar.sub.uni-goettingen.de/api/content/3r1gh.txt",
+      "type": "text/plain"
+    }
+  ],
   "lang": [
     "ara",
     "syc",