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Taking a closer look at the URL http://mydomain.com/books/[ISBN], let s work through how it would be implemented. The URL refers to a specific book with the identified ISBN number. When the URL is sent to an HTTP server, a response is generated. The problem is determining which content the server should send to the client. Separating the resource from the representation means that a single URL will have separate representations. The representation that is sent depends on the value of the HTTP Accept-* header, but that header need not be the only one. As was just mentioned, the user using a query variable could specify the representation. More about other HTTP headers will be discussed shortly. For now, let s focus on the Accept HTTP header and consider the following HTTP conversation that returns some content. Request: GET /books/3791330942 HTTP/1.1 Host: 192.168.1.242:8100 User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; EBVN en-US; rv:1.7.8) Gecko/20050511 Accept: text/xml,application/xml,application/xhtml+xml, text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Response: HTTP/1.1 200 OK Date: Sun, 21 Aug 2005 14:51:40 GMT Server: Apache/2.0.53 (Ubuntu) PHP/4.3.10-10ubuntu4 Last-Modified: Wed, 11 May 2005 17:43:45 GMT ETag: "41419c-45-438fd340" Accept-Ranges: bytes Content-Length: 69 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html; charset=UTF-8 The request is an HTTP GET, which means the HTTP server needs to retrieve the data associated with the resource. The operation becomes specific due to the request-provided HTTP headers Accept, Accept-Language, Accept-Encoding, and AcceptCharset. These HTTP headers are accepted by the HTTP server and indicate what content to send.

In the example, the style attribute and visibility subproperty are assigned a value of hidden. Figure 3-19 shows how the rendered HTML hides the span element.

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"\"DAV:contentclass\"," + "\"DAV:getlastmodified\"," + "\"DAV:getcontentlength\"," + "\"DAV:iscollection\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:profile:WorkPhone\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:profile:WorkEmail\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:profile:Title\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:profile:Department\"," + "\"urn:schemas.microsoft.com:fulltextqueryinfo:PictureURL\"," + "\"urn:schemas-microsoft-com:office:office#Author\"," + "\"urn:schemas.microsoft.com:fulltextqueryinfo:description\"," + "\"urn:schemas.microsoft.com:fulltextqueryinfo:rank\"," + "\"urn:schemas.microsoft.com:fulltextqueryinfo:sitename\"," + "\"urn:schemas.microsoft.com:fulltextqueryinfo:displaytitle\"," + "\"urn:schemas-microsoft-com:publishing:Category\"," + "\"urn:schemas-microsoft-com:office:office#ows_CrawlType\"," + "\"urn:schemas-microsoft-com:office:office#ows_ListTemplate\"," + "\"urn:schemas-microsoft-com:office:office#ows_SiteName\"," + "\"urn:schemas-microsoft-com:office:office#ows_ImageWidth\"," + "\"urn:schemas-microsoft-com:office:office#ows_ImageHeight\"," + "\"DAV:getcontenttype\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:area:Path\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:area:CategoryUrlNavigation\"," + "\"urn:schemas-microsoft-com:publishing:CategoryTitle\"," + "\"urn:schemas.microsoft.com:fulltextqueryinfo:sdid\"," + "\"urn:schemas-microsoft-com:sharepoint:portal:objectid\"" + " from " + "( TABLE Portal_Content..Scope() " + "UNION ALL TABLE Non_Portal_Content..Scope() ) " + " where " + "WITH " + "(\"DAV:contentclass\":0, " + "\"urn:schemas.microsoft.com:fulltextqueryinfo:description\":0, " + "\"urn:schemas.microsoft.com:fulltextqueryinfo:sourcegroup\":0, " + "\"urn:schemas.microsoft.com:fulltextqueryinfo:cataloggroup\":0, " + "\"urn:schemas-microsoft-com:office:office#Keywords\":1.0, " + "\"urn:schemas-microsoft-com:office:office#Title\":0.9, " + "\"DAV:displayname\":0.9, " + "\"urn:schemas-microsoft-com:publishing:Category\":0.8, " + "\"urn:schemas-microsoft-com:office:office#Subject\":0.8, " + "\"urn:schemas-microsoft-com:office:office#Author\":0.7, " + "\"urn:schemas-microsoft-com:office:office#Description\":0.5, " + "\"urn:schemas-microsoft-com:sharepoint:portal:profile:PreferredName\":0.2, " + "contents:0.1,*:0.05) AS #WeightedProps " + "((\"urn:schemas-microsoft-com:publishing:HomeBestBetKeywords\"" + "= some array ['" + keyword + "'] " + " RANK BY COERCION(absolute, 999)) " +

Focusing on the HTTP header Accept, you can see that the values are a series of MIMEencoded identifiers that the client can accept and process The order and type of the identifier are important because they specify the priority of the content that the client wants to receive from the server The logic is to send the best content available that has the best priority defined by the client This, for example, forces the server to send HTML content before plain text content As per the HTTP specification, the priority of the example request-provided MIME types is as follows: 1 application/xhtml+xml 2 text/xml 3 application/xml 4 image/png 5 text/html;q=09 6 text/plain;q=08 7 */*;q=05 The ordering of the identifiers depends on the identifier specialization and its q value When a MIME-type identifier has no q value, it means a default value of 10.

The span element is indeed hidden, but it s apparent that some text is being hidden. This is obvious, because the space required by the span element is still taken. It is sort of like the ostrich that sticks its head in the ground. Sure, you and it cannot see each other, but you know the ostrich is still there. To hide the span element, or any HTML element in particular, you use the display property that you used to determine the alignment of the text. To hide the element completely, set the display subproperty to none, as shown by the following example: (<span id="hidden" style="visibility:none">empty space</span>)

"OR (FREETEXT(" + "\"urn:schemas-microsoft-com:sharepoint:portal:profile:PreferredName\", '" + keyword + "') " + "OR CONTAINS('\"" + keyword + "\"') " + "RANK BY COERCION(multiply, 0.01)) " + "OR FREETEXT(#WeightedProps, '" + keyword + "') ) " + "ORDER BY \"urn:schemas.microsoft.com:fulltextqueryinfo:rank\" DESC"; return queryText; } Once you have a good way for building a full-text query, it is relatively easy to create a web part that uses the query to return results. If you use the function in Listing 4-1, then you will be returning just about every column you may be interested in. You can then pick which columns to display. As always, the simplest thing to do is bind the results to a DataGrid control. Listing 4-2 shows a complete web part that uses a keyword to return a hyperlink and description for each matching item. Listing 4-2. A QueryProvider Web Part using using using using using using using using using using using using using System; System.ComponentModel; System.Web.UI; System.Web.UI.WebControls; System.Xml.Serialization; Microsoft.SharePoint; Microsoft.SharePoint.Portal; Microsoft.SharePoint.Utilities; Microsoft.SharePoint.WebPartPages; Microsoft.SharePoint.WebControls; Microsoft.SharePoint.Portal.Search; System.Data; System.Data.SqlClient;

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