xml schema

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  • Tony Johansson
    #1

    xml schema

    Hello!

    First of all does every Xml document have a schema ?

    I'm trying to get the right feeling for what a xml schema is ?
    As far as I understand it's used for defining a structure how you are permitted to right your Xml document.

    Is it possible to make a simile to C# in some sensible way.

    //Tony


    Tags: None
    • Jon Skeet [C# MVP]
      #2
      Re: xml schema

      Tony Johansson <johansson.ande rsson@telia.com wrote:
      First of all does every Xml document have a schema ?
      No.
      I'm trying to get the right feeling for what a xml schema is ?
      As far as I understand it's used for defining a structure how you are
      permitted to right your Xml document.
      Yes, pretty much.
      Is it possible to make a simile to C# in some sensible way.
      I have no idea what you mean by this, I'm afraid.

      --
      Jon Skeet - <skeet@pobox.co m>
      Web site: http://www.pobox.com/~skeet
      Blog: http://www.msmvps.com/jon.skeet
      C# in Depth: http://csharpindepth.com

        Comment

        • Tony Johansson
          #3
          Re: xml schema

          Hello!

          When should a Xml schema be used and when can you skip it ?

          //Tony

          "Jon Skeet [C# MVP]" <skeet@pobox.co mskrev i meddelandet
          news:MPG.230e09 8880ff515aec8@m snews.microsoft .com...
          Tony Johansson <johansson.ande rsson@telia.com wrote:
          First of all does every Xml document have a schema ?
          >
          No.
          >
          I'm trying to get the right feeling for what a xml schema is ?
          As far as I understand it's used for defining a structure how you are
          permitted to right your Xml document.
          >
          Yes, pretty much.
          >
          Is it possible to make a simile to C# in some sensible way.
          >
          I have no idea what you mean by this, I'm afraid.
          >
          --
          Jon Skeet - <skeet@pobox.co m>
          Web site: http://www.pobox.com/~skeet
          Blog: http://www.msmvps.com/jon.skeet
          C# in Depth: http://csharpindepth.com

            Comment

            • Jon Skeet [C# MVP]
              #4
              Re: xml schema

              Tony Johansson <johansson.ande rsson@telia.com wrote:
              When should a Xml schema be used and when can you skip it ?
              It's a bit like static typing vs dynamic typing - XML schema allows you
              to validate the XML document to some extent. It also enables editors to
              provide the equivalent of Intellisense.

              Personally I'm not a massive fan, but it depends on the situation. It's
              a good way of conveying a specification in a machine-readable format.

              --
              Jon Skeet - <skeet@pobox.co m>
              Web site: http://www.pobox.com/~skeet
              Blog: http://www.msmvps.com/jon.skeet
              C# in Depth: http://csharpindepth.com

                Comment

                • Ken Foskey
                  #5
                  Re: xml schema

                  On Thu, 14 Aug 2008 11:46:33 +0200, Tony Johansson wrote:
                  Hello!
                  >
                  When should a Xml schema be used and when can you skip it ?
                  My take on this is that schema validation should be used sparingly in
                  production. Strict adherence to an XML standard (schema) must be done
                  during testing between exchanging parties but you should be free to
                  handle schema validation errors in production.

                  Ken

                    Comment

                    • Mike Schilling
                      #6
                      Re: xml schema


                      "Tony Johansson" <johansson.ande rsson@telia.com wrote in message
                      news:uAuyo4e$IH A.1296@TK2MSFTN GP02.phx.gbl...
                      Hello!
                      First of all does every Xml document have a schema ?
                      I'm trying to get the right feeling for what a xml schema is ?
                      As far as I understand it's used for defining a structure how you
                      are permitted to right your Xml document.
                      Is it possible to make a simile to C# in some sensible way.
                      An XML document without a schema is roughly like a C# object whose
                      only property is a list of name-value pairs. You can iterate through
                      the list, but until you do, there's no way to tell what names will be
                      present or what type each value will have.

                      An XML document with a schema is like a normal C# object. The type of
                      the object (just like the schema) shows you the properties and their
                      types.


                        Comment

                        • Pavel Minaev
                          #7
                          Re: xml schema

                          On Aug 14, 1:54 pm, Ken Foskey <rmove.fos...@o ptushome.com.au wrote:
                          My take on this is that schema validation should be used sparingly in
                          production.  Strict adherence to an XML standard (schema) must be done
                          during testing between exchanging parties but you should be free to
                          handle schema validation errors in production.
                          A better rule is to be lax on your input but strict on your output. So
                          you wouldn't validate XML when reading it, trying to detect and
                          recover from errors as you go, but you'd validate your outputs, so as
                          to be sure that it adhers to the spec, and your own program and any
                          third-party product can read it back correctly.

                          Also, .NET XML schema validation classes allow one to do incremental
                          validation, and perform recoverable error handling.

                            Comment

                            • Jon Skeet [C# MVP]
                              #8
                              Re: xml schema

                              Pavel Minaev <int19h@gmail.c omwrote:
                              On Aug 14, 1:54 pm, Ken Foskey <rmove.fos...@o ptushome.com.au wrote:
                              My take on this is that schema validation should be used sparingly in
                              production.  Strict adherence to an XML standard (schema) must be done
                              during testing between exchanging parties but you should be free to
                              handle schema validation errors in production.
                              A better rule is to be lax on your input but strict on your output.
                              I find it's better to be strict on both input and output. Everyone
                              being lax on input means that errors on output don't get noticed. Being
                              lax on input is what got browsers into such a horrible mess as they
                              tried to work out what invalid HTML was meant to read.

                              Invalid XML is particularly inexcusable, as it's meant to be machine
                              generated - if something is generating XML which doesn't conform to the
                              spec, it is *broken* and you shouldn't work with it IMO.

                              --
                              Jon Skeet - <skeet@pobox.co m>
                              Web site: http://www.pobox.com/~skeet
                              Blog: http://www.msmvps.com/jon.skeet
                              C# in Depth: http://csharpindepth.com

                                Comment

                                • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
                                  #9
                                  Re: xml schema

                                  Tony Johansson wrote:
                                  When should a Xml schema be used and when can you skip it ?
                                  You should use it whenever you have time to do one.

                                  Arne

                                    Comment

                                    • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
                                      #10
                                      Re: xml schema

                                      Pavel Minaev wrote:
                                      On Aug 14, 1:54 pm, Ken Foskey <rmove.fos...@o ptushome.com.au wrote:
                                      >My take on this is that schema validation should be used sparingly in
                                      >production. Strict adherence to an XML standard (schema) must be done
                                      >during testing between exchanging parties but you should be free to
                                      >handle schema validation errors in production.
                                      >
                                      A better rule is to be lax on your input but strict on your output. So
                                      you wouldn't validate XML when reading it, trying to detect and
                                      recover from errors as you go, but you'd validate your outputs, so as
                                      to be sure that it adhers to the spec, and your own program and any
                                      third-party product can read it back correctly.
                                      >
                                      Also, .NET XML schema validation classes allow one to do incremental
                                      validation, and perform recoverable error handling.
                                      I would not recommend continue processing XML that is not
                                      valid according to the expected XSD.

                                      Something is wrong and until the reason is invesigated
                                      it could do more harm than good to continue.

                                      Arne

                                        Comment

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