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XML Tips from perfectxml.com [Page 3]

  • What is XHTML?
    The W3C is currently working on a proposed recommendation for an implementation of XML known as XHTML - this implementation will obey all of the grammer rules of XML, while conforming to the vocabulary of HTML. The XHTML document that you create may be sent to client with a mime-type of HTML or XML, allowing the greatest flexibility in rendering and manipulation at the client side. The XML DOM may then be used to manipulate the contents of the XHTML document directly.


  • XML and Binary data
    XML document is a text document with tags and text data enclosed within tags. If you want to send binary data as part of XML document (for ex: <BookImage>some binary data, image</BookImage>), you'll have to encode the binary data using base64 encoding. Base64 processes data as 24-bit groups, mapping this data to four encoded characters. It is sometimes referred to as 3-to-4 encoding. And again, on the recieving side, decoding the base64 data to binary data. There are many ways to do this encoding/decoding (including using MSXML.dll), if you need additional details and code sample, please send mail to Darshan Singh.


  • What is ROPE?
    Remote Object Proxy Engine, or ROPE, is a powerful COM component built to make life easier for SOAP developers who are used to programming in Visual Basic. SOAP provides several distinct objects that can be used by both the client and the server. ROPE COM component abstracts all SOAP's implementation details. One of the objects ROPE can be used to encode binary data into HTTP-compatible (Base64) form.


  • XML-RPC
    The XML-RPC protocol defines a way for RPC requests and responses to be serialized into XML documents and sent across an HTTP connection. One major difference between SOAP and XML-RPC is that XML-RPC uses a <methodName> element with the method name; SOAP however uses the method name as the name of the element. Partemeters in XML-RPC are encoded with type information elements such as <string>, which in contrary to SOAP which allows the use of XML Schemas to describe the data types.


  • XML Certification

    Check out www.perfectxml.com/Certify - the complete and up-to-date resource center dedicated to IBM XML Certification Test 141

    When everybody is studying hard to finish their MCSDs and MCSEs, if you think, you know XML well, why not appear for XML certification and tell your friends/co-workers that you are a "XML certified" professional.
    Check out more details at: www.perfectxml.com/Certify


  • What is UDDI?
    UDDI, or "Universal Description, Discovery and Integration" initiative is essentially a Web Service registry, implemented with a programmatic SOAP interface that allows businesses to basically advertise the existence of their web-based services or to query for the existence of other web-based services. At the moment, at least, UDDI does not appear to be a mechanism for describing specific SOAP services (as is the case with SCL and NASSL), yet rather a mechanism for describing where and how to access SOAP service descriptions and the services they describe. Essentially the Yahoo of Web Services.
    For more details check out: External linkUDDI.org


  • XML And Special Characters
    XML predefines five entity references for special characters that would otherwise be interpreted as part of markup language. These five characters are: &, <, >, ", and '. Microsoft published a KB Article (http://support.microsoft.com/support/kb/articles/Q251/3/54.ASP) on how to deal with these special characters, but code in this article is not that useful. Here are the two functions that I wrote to deal with these special characters.

    Function ReplaceXMLSpecChars(ByVal strSource)
        lngPointer1 = InStr(strSource, "&")
        lngPointer2 = InStr(strSource, "<")
        lngPointer3 = InStr(strSource, ">")
        lngPointer4 = InStr(strSource, """")
        lngPointer5 = InStr(strSource, "'")
        If lngPointer1 = 0 And lngPointer2 = 0 And lngPointer3 = 0 And lngPointer4 = 0 And lngPointer5 = 0 Then
            ReplaceXMLSpecChars = strSource
        Else
            strNew = ReplaceSingleXMLSpecChar(strSource, "&", "&amp;")
            strNew = ReplaceSingleXMLSpecChar(strNew, "<", "&lt;")
            strNew = ReplaceSingleXMLSpecChar(strNew, ">", "&gt;")
            strNew = ReplaceSingleXMLSpecChar(strNew, """", "&quot;")
            strNew = ReplaceSingleXMLSpecChar(strNew, "'", "&apos;")
            ReplaceXMLSpecChars = strNew
        End If
    End Function
    
    
    
    Function ReplaceSingleXMLSpecChar(ByVal strSource, ByVal strSearchFor , ByVal strReplace )
        lngPointer = InStr(strSource, strSearchFor)
    											    
        If lngPointer = 0 Then
    											        
            ReplaceSingleXMLSpecChar = strSource
    											    
        Else
    											        
            strValidString = ""
    											        
            While Not lngPointer = 0
                strValidString = strValidString & Mid(strSource, 1, lngPointer - 1) & strReplace
                strSource = Mid(strSource, lngPointer + 1)
                lngPointer = InStr(strSource, strSearchFor)
            Wend
            strValidString = strValidString & strSource
            ReplaceSingleXMLSpecChar = strValidString
        End If
    End Function
    

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