Comments on: Haskell data types and XML http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/ Silk Blog Mon, 23 Jan 2012 10:22:13 +0000 hourly 1 http://wordpress.org/?v=3.0.5 By: Maurice http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-3413 Maurice Mon, 18 Jul 2011 11:33:15 +0000 http://blog.typlab.com/?p=15#comment-3413 Hi Sebas, thanks your your reply. Sorry, you just tickled my curiosity. Could you provide some details about what graph-database you used and what the simple-sparql language is you use, and why you have made these choices? I would love to learn more about what is pragmatic and 'gangbaar'[nl] these days. kind regards Hi Sebas, thanks your your reply.

Sorry, you just tickled my curiosity. Could you provide some details about what graph-database you used and what the simple-sparql language is you use, and why you have made these choices?
I would love to learn more about what is pragmatic and ‘gangbaar’[nl] these days.

kind regards

]]> By: Sebas http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-3325 Sebas Mon, 11 Jul 2011 15:44:03 +0000 http://blog.typlab.com/?p=15#comment-3325 Hi Maurice, You are right, this post is a bit dated, we don't use XML anymore as the storage for assertions. We use a separate graph-database now that encodes the semantic information, structured similar to RDF. We don't use SPARQL itself, but a similar much simpler query language. Hi Maurice,

You are right, this post is a bit dated, we don’t use XML anymore as the storage for assertions. We use a separate graph-database now that encodes the semantic information, structured similar to RDF. We don’t use SPARQL itself, but a similar much simpler query language.

]]> By: Maurice http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-3315 Maurice Sun, 10 Jul 2011 20:32:48 +0000 http://blog.typlab.com/?p=15#comment-3315 hi sebas and erik, Great work going on at silk! I have seen your silkapp appeared om the TNW.com website. Yet these articles are very dated. So what's up? The question: The data you are crunching are assertions in nature. So why use an XML database and not using a tripplestore using RDF? XML needs a strict data model, if new assertions are made, different from the specification in your internal datamodel, it would be more difficult to insert new data, and relate this data to existing assertions in your database. I know the strictness of XML is easy to use with; you get what you asked for because the system 'knows' that to expect. Yet this would make it very labor intensive task to insert new data and unexpected assertions beyond your wildest dreams, offering the user a whole lot more then the data in the datamodel specification. For example the user can be offered more assertions from the databases in the linkeddata cloud. The drawback of this, I guess, it is harder to create a neat user interface, and overwhelming the end-user with the richness. Well, please leave a note about your thoughts using RDF and SPARQL services. kind regards hi sebas and erik,
Great work going on at silk! I have seen your silkapp appeared om the TNW.com website.
Yet these articles are very dated. So what’s up?

The question: The data you are crunching are assertions in nature. So why use an XML database and not using a tripplestore using RDF?

XML needs a strict data model, if new assertions are made, different from the specification in your internal datamodel, it would be more difficult to insert new data, and relate this data to existing assertions in your database.
I know the strictness of XML is easy to use with; you get what you asked for because the system ‘knows’ that to expect.
Yet this would make it very labor intensive task to insert new data and unexpected assertions beyond your wildest dreams, offering the user a whole lot more then the data in the datamodel specification. For example the user can be offered more assertions from the databases in the linkeddata cloud. The drawback of this, I guess, it is harder to create a neat user interface, and overwhelming the end-user with the richness.
Well, please leave a note about your thoughts using RDF and SPARQL services.

kind regards

]]> By: Hamish Mackenzie http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-21 Hamish Mackenzie Fri, 25 Sep 2009 00:20:41 +0000 http://blog.typlab.com/?p=15#comment-21 I also have something similar, but I did not use XmlPickler or Regular. Just TH and Happstack.Data's XML types. Its not complete or pretty, but it works for the XML files I have. I would love to try out and contribute to your library. I need to be able to specify names with different capitalisation (eg "UserName" in place of "userName" or "ABCData" in place of "abcData"). Currently I provide a list of names and use a function to convert them in TH to field names (so I get compiler errors if the field is not found). I also need some data to go in XML attributes. Currently I just read attributes as if they were elements, but it would be nice if it knew to write them as well. I also have something similar, but I did not use XmlPickler or Regular. Just TH and Happstack.Data’s XML types. Its not complete or pretty, but it works for the XML files I have. I would love to try out and contribute to your library.

I need to be able to specify names with different capitalisation (eg “UserName” in place of “userName” or “ABCData” in place of “abcData”). Currently I provide a list of names and use a function to convert them in TH to field names (so I get compiler errors if the field is not found).

I also need some data to go in XML attributes. Currently I just read attributes as if they were elements, but it would be nice if it knew to write them as well.

]]> By: Sebas http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-20 Sebas Thu, 24 Sep 2009 22:42:48 +0000 http://blog.typlab.com/?p=15#comment-20 Max: When you have implemented features that we did not include in our version we would certainly like to know. We'll probably soon release the generic pickler code so we can compare the efforts. Is your code on Hackage? Max: When you have implemented features that we did not include in our version we would certainly like to know. We’ll probably soon release the generic pickler code so we can compare the efforts. Is your code on Hackage?

]]> By: Max http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-19 Max Thu, 24 Sep 2009 22:32:11 +0000 http://blog.typlab.com/?p=15#comment-19 Hi, I wrote a similar generic package to derive XmlPickler instances for types. I didn't use the Regular package, just hand crafted TH. Perhaps we should combine efforts? Hi, I wrote a similar generic package to derive XmlPickler instances for types. I didn’t use the Regular package, just hand crafted TH. Perhaps we should combine efforts?

]]> By: Erik http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-18 Erik Thu, 24 Sep 2009 20:42:30 +0000 http://blog.typlab.com/?p=15#comment-18 Justin: We have a feed for all articles, all comments, and comments on a single article. What more do you need? Justin: We have a feed for all articles, all comments, and comments on a single article. What more do you need?

]]> By: Justin Bailey http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-17 Justin Bailey Thu, 24 Sep 2009 19:48:29 +0000 http://blog.typlab.com/?p=15#comment-17 Neat article. You guys really need an RSS feed on this page, though. Neat article. You guys really need an RSS feed on this page, though.

]]> By: Sebas http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-15 Sebas Thu, 24 Sep 2009 08:44:53 +0000 http://blog.typlab.com/?p=15#comment-15 Not yet. Our current system doesn't really need complex queries, but that might change in the future. Having type safe queries would indeed be a nice addition. Not yet. Our current system doesn’t really need complex queries, but that might change in the future. Having type safe queries would indeed be a nice addition.

]]> By: Chris http://blog.silkapp.com/2009/09/haskell-data-types-and-xml/comment-page-1/#comment-14 Chris Thu, 24 Sep 2009 08:11:54 +0000 http://blog.typlab.com/?p=15#comment-14 Excellent! Do you have a typed way to write the XQuery expressions as well? It would be nice to see that it matches the schema. Excellent! Do you have a typed way to write the XQuery expressions as well? It would be nice to see that it matches the schema.

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