signatures for services updated

doc/signatures.txt

@@ -37,6 +37,38 @@ fileId: {
 }
 
 
+---------------
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+							 assert if targetPath is file then response list must be singleton
+                             {index: [], dir: fileID.pdf.gz, targetPath: fileID.images.json.gz} -> [{data: pdf bytes, metadata: request: ...] -> [{data: null, metadata: request: null, response: {classification infos: ...}]
+image classification now   : Mdat (fn, [Int], file) -> [JSON (Data PDF, Mdat)] -> [JSON (Data null, Mdat [ImObj])]  | 1 -> 1
+							 assert if targetPath is file then response list must be singleton
+                             {index: [], dir: fileID/images, targetPath: fileID.images.json.gz} -> [{data: image bytes, metadata: request: {image location...}] -> [{data: null, metadata: request: null, response: {classification infos: ...}]
+image classification future: Mdat (fn, [Int], dir) -> JSON (Data [FunkIm], Mdat) -> [JSON (Data null, Mdat [FunkIm])]                 |
+object detection           : Mdat (fn, [Int], dir) -> (Data [PagIm] -> JSON [[Mdat SemIm]])
+table parsing              : Mdat (fn, [Int], dir) -> (Data [PagIm] -> JSON [[Mdat FunkIm]])
+NER                        : Mdat (fn, [Int], file) -> (Data [Dict] -> JSON [Mdat])
+pdf2image                  : Mdat (fn, [Int], file) -> (JSON ([Int], Data PDF) -> [(FunkIm, Mdat)])
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+ aggregate <==> targetpath is file and index is empty
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