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Because the XML data you need to send to DataCash has a simple and standard structure, we ll build it manually in a string, without using the XML support offered by PHP 5. We will, however, take advantage of PHP 5 s SimpleXML extension, which makes reading simple XML data a piece of cake. Although less complex and powerful than DOMDocument, the SimpleXML extension makes parsing XML data easy by transforming it into a data structure you can simply iterate through. You first met the SimpleXML extension in 11.

12.1.2 The Extensible Metadata Platform (XMP)

The values in the pivot table change and now show only the total insured values for policies sold to manufacturing businesses. Of the total insured values in the Midwest region, only $25 million is for manufacturing businesses with flood coverage (see Figure 3-6). In cell B1 on the worksheet, the drop-down arrow has changed to a filter symbol with a small blue arrow. In the PivotTable Field List pane, there is a filter icon beside BusType in the field list to show that it has a filter applied to that field.

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Note For the code that communicates with DataCash, we use the CURL library (http://curl. haxx.se/). Read Appendix A for complete installation instructions. Under Linux, the process can be more complicated, but if you are running PHP under Windows, you just need to copy libeay32.dll and ssleay32.dll from the PHP package to the System32 folder of your Windows installation and uncomment the following line in php.ini (by default, located in your Windows installation folder) by removing the leading semicolon, and then restarting Apache: extension=php_curl.dll. For more details about the CURL library, check out the excellent tutorial at http://www.zend.com/ pecl/tutorials/curl.php. The official documentation of PHP s CURL support is located at http://www.php.net/curl.

The Extensible Metadata Platform provides a standard format for the creation, processing, and interchange of metadata. An XMP stream can be embedded in a number of popular file formats (TIFF, JPEG, PNG, GIF, PDF, HTML, and so on) without breaking their readability by non-XMP-aware applications. The XMP specification defines a model that can be used with any defined set of metadata items. It also defines particular schemas; for instance, the Dublin Core schema provides a set of commonly used properties such as the title of the document, a description, and so on. For PDF files, there s a PDF schema with information about the keywords, the PDF version, and the PDF producer. This way, an application that can t interpret PDF syntax can still extract the metadata from the file by detecting and parsing the XML that is embedded inside the PDF. What follows is an example of such an XMP metadata stream.

< xpacket begin=" " id="W5M0MpCehiHzreSzNTczkc9d" > <x:xmpmeta xmlns:x="adobe:ns:meta/"> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> <rdf:Description rdf:about="" xmlns:dc="http://purl.org/dc/elements/1.1/"> <dc:format>application/pdf</dc:format> <dc:description><rdf:Alt> <rdf:li>This example shows how to add metadata</rdf:li> </rdf:Alt></dc:description> <dc:subject><rdf:Bag> <rdf:li>This example shows how to add metadata</rdf:li> </rdf:Bag></dc:subject> <dc:title><rdf:Alt> <rdf:li>Hello World example</rdf:li> </rdf:Alt></dc:title> <dc:creator><rdf:Seq> <rdf:li>Bruno Lowagie</rdf:li> </rdf:Seq></dc:creator> </rdf:Description> <rdf:Description rdf:about="" xmlns:pdf="http://ns.adobe.com/pdf/1.3/"> <pdf:Producer>iText 5.0.1 (c) 1T3XT BVBA</pdf:Producer> <pdf:keywords>Metadata, iText, PDF</pdf:keywords> </rdf:Description> <rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/"> <xmp:CreateDate>2010-01-22T16:31:00+01:00</xmp:CreateDate> <xmp:ModifyDate>2010-01-22T16:31:01+01:00</xmp:ModifyDate> <xmp:CreatorTool>My program using iText</xmp:CreatorTool> </rdf:Description> </rdf:RDF> </x:xmpmeta> < xpacket end="w" >

1. Create a new file named datacash_request.php in the business folder, and add the following code to it: < php class DataCashRequest { // DataCash Server URL private $_mUrl; // Will hold the current XML document to be sent to DataCash private $_mXml; // Constructor initializes the class with URL of DataCash public function __construct($url) { // Datacash URL $this->_mUrl = $url; } /* Compose the XML structure for the pre-authentication request to DataCash */ public function MakeXmlPre($dataCashClient, $dataCashPassword, $merchantReference, $amount, $currency, $method, $cardNumber, $expiryDate, $startDate = '', $issueNumber = '') { $this->_mXml = "< xml version=\"1.0\" encoding=\"UTF-8\"\x3F> <Request> <Authentication> <password>$dataCashPassword</password>

This stream was created with iText using the XmpWriter class. The following bit of code shows how to add an XMP stream as metadata.

Figure 3-6. A report filter has been applied. With this filter applied, you can also see that for the manufacturing businesses, all the policies sold in the Central region have flood coverage, but no policies sold in the Northeast region have flood coverage.