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Can I change the producer info The value for the PDF producer tells you which version of iText was used to create the document. It s also a way to tell the end users of the document that iText was used to create it. You can t change this without breaking the software license that allows you to use iText for free.

The try should be placed immediately after the resource has been opened. Placing the open statement within the try..finally block is likely to cause problems if the open process throws an exception. This is because the flow of control would be routed through the close() statement while the connection is in an unstable state, and was probably never opened. The steps to compile and run this example follow. Since we are only dealing with a single class, the MsgClient, there is no need to JAR this application in order to run it. 13.3.3 Compiling and running the application Use the following command line to compile the application:

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The Styles area will appear along the left side of the window, as you see in Figure 2-17. A thin frame separates the Styles area from the rest of the document. You can click and drag the frame to increase or decrease the size of the Styles area.

A dictionary is a PDF object, and the values that are stored in this dictionary are also PDF objects. PDF viewers such as Adobe Reader don t have any problem interpreting these objects, but applications that aren t PDF-aware can t find or read this meta-information. The Extensible Metadata Platform (XMP) was introduced to solve this problem.

>e:\jdk1.3\bin\javac -g:none -bootclasspath e:\midp-fcs\classes -classpath .\build -d .\build MsgClient.java

12.1.2 The Extensible Metadata Platform (XMP)

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.

Use the following command to preverify the application:

< 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" >

Use the following command to run the application:

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

PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT1)); ByteArrayOutputStream os = new ByteArrayOutputStream(); XmpWriter xmp = new XmpWriter(os); XmpSchema dc = new com.itextpdf.text.xml.xmp.DublinCoreSchema(); XmpArray subject = new XmpArray(XmpArray.UNORDERED); Defines the Dublin subject.add("Hello World"); Core Schema subject.add("XMP & Metadata"); subject.add("Metadata"); dc.setProperty(DublinCoreSchema.SUBJECT, subject); xmp.addRdfDescription(dc); PdfSchema pdf = new PdfSchema(); pdf.setProperty(PdfSchema.KEYWORDS, Defines the "Hello World, XMP, Metadata"); PDF Schema pdf.setProperty(PdfSchema.VERSION, "1.4"); xmp.addRdfDescription(pdf); xmp.close(); writer.setXmpMetadata(os.toByteArray());

The first screen to appear when running the application is the menu options of the MsgClient application. This is shown in figure 13.2.

You use the byte[] created with XmpWriter with the setXmpMetadata() method to add the stream to the PdfWriter. This XMP stream covers the complete document. It s also possible to define an XML stream for individual pages. In that case you need to use the setPageXmpMetadata() method. You can delegate the creation of the XMP stream to iText. Just create the metadata as done in listing 12.1, and add the following line:

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