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XQuery predicates also provide access to a special function known as position(). You can use the position() function to return an element at a specific position in your XML data. You can also retrieve Colonel Tom Parker from the sample XML data using the position() function, as shown in the following path expression:

To delete a message, use the delete command and provide your victim s ID as the direct parameter For example, the following command deletes the message identified by the variable myMessage:

May-10

/Officers/Colonel[position() = 2]

When you receive a message with one or more files attached, the message has an attachments list containing an attachment object for each file Table 16-10 explains the properties of the attachment object To save an attachment to a folder, you can use the standard save command with the name property of the appropriate item in the attachments object For example, the following statement saves the first attached file of the selected message (the first message of the selection) to the folder Server:Process:

You can also use a special type of predicate, known as a numeric predicate, which consists of a single integer number, as shown in the following path expression:

Jun-10

/Officers/Colonel[2]

set current_selection to selection set this_mess to item 1 of current_selection set incoming_files to the attachments of this_mess set my_file_name to the name of the first item in incoming_files save the first item of incoming_files in "Server:Process:" & my_file_name

The numeric predicate is functionally equivalent to using the position() function. It acts similarly to a 1-based array index. The numeric predicate in the example returns the second instance of a <Colonel> element that it encounters in the path expression in this case the path expression retrieves the Colonel Tom Parker element.

7/02/2010

XQuery doesn t process your XML in its textual form. Querying the text of your XML documents would have negative results, including the following: Storing the plain text of your XML documents would be inefficient. Querying the textual content of your XML documents would degrade performance, in many cases severely. Querying that relies on the raw textual representation of your XML documents would be inflexible, because you couldn t assign data types to your XML document content. In order to accommodate more efficient storage and querying, and to increase flexibility, XQuery converts your raw textual XML data to a format known as the XQuery/ XPath Data Model (XDM). XDM relies on a tree-like representation of your textual XML document. Consider the XML content in listing 3.

If the message has multiple attachments, use a repeat loop to save each attachment in turn Here s an example that again uses the selection object:

<employee id = "109"> <name>Ken J. S nchez</name> <title>CEO</title> <date-of-hire>2002-10-12</date-of-hire> </employee> <employee id = "6"> <name>David Bradley</name> <title>Marketing Mgr</title> <date-of-hire>2003-01-04</date-of-hire> </employee>

set current_selection to selection set this_mess to item 1 of current_selection set incoming_files to the attachments of this_mess repeat with myCounter from 1 to count of items in incoming_files set my_file_name to the name of item myCounter in incoming_files save item myCounter of incoming_files in "Server:Process:" & my_file_name end repeat

Aug-10

The full W3C XDM recommendation is available at http://www.w3.org/ TR/xpath-datamodel/.

Element Node Name: employee Parent: Document Node Children: name, title, date-of-hire Type-name: annonymous complex type

The attachment s name This property is read-only The file type of the attachment This property is read-only The MIME encoding used for the attachment s data This can be no encoding, 7bit encoding, 8bit encoding, binhex, base64, uuencode, AppleSingle, AppleDouble, quoted printable, or (if you re out of luck) unknown encoding This property is read-only The alias to the file The encoded content of the file (assuming it has been encoded) A property that lets you set a list of properties

1200 1175 1150 114750 1125 1100 1075 107725 1050 1025 R PercentR (14) = 1789 100 75 Williams %R (14 Days) 50 25 1789 0 Sep-10

Element Node Name: employee Parent: Document Node Children: name, title, date-of-hire Type-name: annonymous complex type