DataForm Webpart Inside (1)

the most simplest xsl format:

 <xsl:stylesheet xmlns:x="http://www.w3.org/2001/XMLSchema" xmlns:d="http://schemas.microsoft.com/sharepoint/dsp"
                   version="1.0" exclude-result-prefixes="xsl msxsl ddwrt"
                   xmlns:ddwrt="http://schemas.microsoft.com/WebParts/v2/DataView/runtime"
                   xmlns:asp="http://schemas.microsoft.com/ASPNET/20"
                   xmlns:__designer="http://schemas.microsoft.com/WebParts/v2/DataView/designer"
                   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                   xmlns:msxsl="urn:schemas-microsoft-com:xslt"
                   xmlns:SharePoint="Microsoft.SharePoint.WebControls"
                   xmlns:ddwrt2="urn:frontpage:internal">
              <xsl:output method="html" indent="no"/>
              <xsl:decimal-format NaN=""/>
              <xsl:param name="dvt_apos">'</xsl:param>
              <xsl:param name="ManualRefresh"></xsl:param>
              <xsl:param name="dvt_firstrow">1</xsl:param>
              <xsl:param name="dvt_nextpagedata" />
              <xsl:variable name="dvt_1_automode">0</xsl:variable>
              <xsl:template match="/">
              </xsl:template>
</xsl:stylesheet>

what is xmlns?

check here

http://www.xml.com/pub/a/2003/09/03/trxml.html

http://www.ibm.com/developerworks/cn/xml/x-xsltext/

http://hi.baidu.com/daijun2007/blog/item/2b0ae31863c1580a34fa4142.html

what is inside sharepoint xmlns?

ddwrt:

it contains many useful extension function:
    AutoHyperLink
    AutoNewLine
    ConnEnclode
    Counter
    FieldFilterImageUrl
    FieldFilterOptions
    FieldPrefix
    FieldSortImageUrl
    FieldSortParameters
    FilterLink
    FormatDate
    FormatDateTime
    GenDisplayName
    GenFireConnection
    GenFireServerEvent
    GetFileExtension
    GetStringBeforeSeparator
    GetVar
    IfNew
    IsPrivilegedUser
    Limit
    ListProperty
    MapToAll
    MapToControl
    MapToIcon
    NameChanged
    PresenceEnabled
    SelectOptions
    SetVar
    ThreadStamp
    Today
    TodayIso
    UrlBaseName
    UrlDirName
    UrlEncode
    URLLookup
    UserLookup

find in here:http://msdn.microsoft.com/en-us/library/aa505323.aspx

example:

<xsl:template name="dvt_1.rowview">
       <xsl:value-of select="ddwrt:UserLookup('domain\avmin','ID')"/> 
       <xsl:value-of select="@Title"/><Br/>
</xsl:template>

HTML Result:

xmlns:asp

it allow you add asp.net webcontrol to server in your xslt;

example:

<xsl:template name="dvt_1.rowview">
    <xsl:value-of select="@Title"/>    
    <asp:TextBox id="myControl1{generate-id()}" runat="server"/>
</xsl:template>

xmlns:_designer 

http://www.bryancook.net/2009/09/understanding-sharepoints-ddwrtdatabind.html

it mainly bind form control to using updating, inserting, and deleting item data

<SharePoint:FormField runat="server" id="ff1{$Pos}" 
    ControlMode="Edit" FieldName="Field1"
    __designer:bind="{
        ddwrt:DataBind(
            'u', 
            concat('ff1',$Pos), 'Value', 'ValueChanged'
            'ID', ddwrt:EscapeDelims(@ID), '@Field1'
        )}"
    />

Sharepoint blocked the msxsl:script , so we can ignore msxsl tag.