some Explain comments

["Denenberg, Ray" <rden@loc.gov>]

Hi Janifer - I did a quick pass through the SRU draft to check it against the explain draft, and I note the following missing.


Query types. List supported query types, and for each (except for well-known types, CQL and searchTerms) 
  - a URI identifying query type's definition, 
  -  a URL for a location where the query type's definition may be found,
  - a short name for the value of the parameter queryType to be used in a request.


Sort schema
lists sort schemas supported. I see that there is an attribute on a record schema to indicate whether it can be used as sort schema, but there may be a sort schema supported that isn't a record schema.  One possibile solution would be to and another attribute saying whether it is a record schema, and just have explain list all the schemas, whether record or sort. 


recordXMLEscaping
-  indicate whether 'string' is supported. 
-  indicate whether 'xml' is supported.

recordXMLEscaping
-  indicate whether 'packed' is supported. 
-  indicate whether 'unpacked' is supported.
(Though the latter is dubious.  Any server is free to say it supports unpacked and then not unpack the data because 'unpacked' isn't really well-defined.)



responseFormat. list each response format. For each:
 -  the string used in the request
 - a URI identifying the format
 - a URL to the its definition 
 - list of all media types it may be used in conjunction with


Next, I'll take a look at CQL. 

--Ray