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The XML data isn t so interesting; it s a little like a television box There are really no user-serviceable parts inside, and everything works just ne (Unless, of course, you were a mischievous kid who physically took apart video games!) On the other hand, the XML Schema is much more interesting for a few reasons First, it s much simpler and easy to read Second, and most importantly, if you created your form from an existing XML Schema, InfoPath may not allow changes to the data source As a result, you will not be able to add digital signatures to your form template We ll show you what the schema elements look like and how you can add them to the XML Schema in your form template to open it up for digital signatures Let s look at what InfoPath generates in the XML Schema to create a signatures group
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<xsd:element name="signatures1"> <xsd:complexType> <xsd:sequence> <xsd:any minOccurs="0" maxOccurs="unbounded" namespace="http://wwww3org/2000/09/xmldsig#" processContents="lax"/> </xsd:sequence> </xsd:complexType> </xsd:element>
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That s simple, isn t it The xsd:any schema element says that anything can exist zero or as many times as necessary in the http://wwww3org/ 2000/09/xmldsig# namespace This namespace completely de nes a digital signature within an XML le such as an InfoPath form Say we started from the following xed schema le that doesn t allow signatures
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< xml version="10" > <xsd:schema xmlns:xsd="http://wwww3org/2001/XMLSchema"> <xsd:element name="ClosedNode"> <xsd:complexType> <xsd:sequence> <xsd:element name="foo" type="xsd:string"/> </xsd:sequence> <xsd:attribute name="bar" type="xsd:string"/> </xsd:complexType> </xsd:element> </xsd:schema>
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This schema simply de nes a document element called ClosedNode with two elds: an element foo and an attribute bar If you create a new form template based on this schema, you will nd that digital signatures cannot be added because the data source is locked Time to do a little surgery on the schema!
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Before making any hand modi cations to any les, rst create a backup! To begin, open the XML Schema (xsd) le you used to create your form template in a text editor You should see something like our example schema just shown (We suggest rst practicing on our schema) Next, create a new element under the document element that references a yet-to-be-de ned element called signatures1 The changes are shown here in bold
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< xml version="10" > <xsd:schema xmlns:xsd="http://wwww3org/2001/XMLSchema"> <xsd:element name="ClosedNode"> <xsd:complexType> <xsd:sequence> <xsd:element name="foo" type="xsd:string"/> <xsd:element ref="signatures1"/>
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</xsd:sequence> <xsd:attribute name="bar" type="xsd:string"/> </xsd:complexType> </xsd:element> </xsd:schema>
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Now that you ve added the reference to signatures1, copy it from that schema snippet and put it into our schema Changes, once again, are in bold
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< xml version="10" > <xsd:schema xmlns:xsd="http://wwww3org/2001/XMLSchema"> <xsd:element name="ClosedNode"> <xsd:complexType> <xsd:sequence> <xsd:element name="foo" type="xsd:string"/> <xsd:element ref="signatures1"/> </xsd:sequence> <xsd:attribute name="bar" type="xsd:string"/> </xsd:complexType> </xsd:element> <xsd:element name="signatures1"> <xsd:complexType> <xsd:sequence> <xsd:any minOccurs="0" maxOccurs="unbounded" namespace="http://wwww3org/2000/09/xmldsig#" processContents="lax"/> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
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That s it! You re done modifying the XML Schema to support digital signatures in InfoPath If you ve already created a form template and need to update its schema, you can use the Convert Main Data Source option on the Tools menu to use the newly modi ed schema If you haven t yet created a form template, you can design a new form template against this updated schema Now you can use digital signatures with any XML Schema! If you need multiple signatures (eg, with partial signatures) in your form template, you will need to create multiple signature elements in the XML Schema A one-to-one mapping should exist; for each partial signature, a new signatures element must be created Follow the same process just shown to edit the XML Schema le; however, you will need to give each signature group a unique name In our example, we used the name signatures1 The next signatures element could be called signatures2,
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