CodeSmith允许我们存储元数据在XML文件中，然后在执行模版时直接打开XML文件填写到属性面板中。
1．XML Property With a Schema
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<?xml version="1.0" encoding="UTF-8"?>
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<xs:schema targetNamespace=http://www.codesmithtools.com/PO
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xmlns:xs=http://www.w3.org/2001/XMLSchema
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xmlns=http://www.codesmithtools.com/PO
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elementFormDefault="qualified" attributeFormDefault="unqualified">
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<xs:element name="PurchaseOrder">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="PONumber" type="xs:string"/>
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<xs:element name="CustomerName" type="xs:string"/>
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<xs:element name="CustomerCity" type="xs:string"/>
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<xs:element name="CustomerState" type="xs:string"/>
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<xs:element name="Items">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="Item" maxOccurs="unbounded">
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<xs:complexType>
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<xs:attribute name="ItemNumber" type="xs:string" use="required"/>
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<xs:attribute name="Quantity" type="xs:integer" use="required"/>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:schema>
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这是一个简单的带有Schema的XML Property的例子：
利用这个Schema文件，我们可以定义一个XML Property来在运行时读去元数据。
<%@ CodeTemplate Language="C#" TargetLanguage="Text" Description="Create packing list from XML PO." %>
<%@ XmlProperty Name="PurchaseOrder" Schema="PO.xsd" Optional="False" Category="Data" Description="Purchase Order to generate packing list for." %>
Packing List
ref: PO#<%= PurchaseOrder.PONumber %>
Ship To:
<%= PurchaseOrder.CustomerName %>
<%= PurchaseOrder.CustomerCity %>, <%= PurchaseOrder.CustomerState %>
Contents:
<% for (int i = 0; i < PurchaseOrder.Items.Count; i++) { %>
<%= PurchaseOrder.Items[i].ItemNumber %>, Quantity <%= PurchaseOrder.Items[i].Quantity %>
<% } %>
在运行时，PurchaseOrder属性在属性面板中显示为按钮，单击后弹出一个对话框供用户选择XML文件。
选择一个XML文件。在该例子XML文件内容如下：
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<?xml version="1.0" encoding="UTF-8"?>
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<PurchaseOrder xmlns=http://www.codesmithtools.com/PO
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<PONumber>5271</PONumber>
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<CustomerName>John Nelson</CustomerName>
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<CustomerCity>Gamonetta</CustomerCity>
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<CustomerState>MS</CustomerState>
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<Items>
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<Item ItemNumber="HM85" Quantity="12"/>
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<Item ItemNumber="JR82" Quantity="4"/>
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<Item ItemNumber="PR43" Quantity="6"/>
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</Items>
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</PurchaseOrder>
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生成后的代码如下：
Packing List
ref: PO#5271
Ship To:
John Nelson
Gamonetta, MS
Contents:
HM85, Quantity 12
JR82, Quantity 4
PR43, Quantity 6
2．XML Property Without a Schema
这是一个不带Schema的XML Property的例子。这个模版在运行时可以访问任何XML文件。
<%@ CodeTemplate Language="VB" TargetLanguage="Text" Description="List top-level nodes in an XML file." %>
<%@ XmlProperty Name="TargetFile" Optional="False" Category="Data" Description="XML file to iterate." %>
<%@ Assembly Name="System.Xml" %>
<%@ Import Namespace="System.Xml" %>
Top-level nodes:
<% Dim currNode as XmlNode
currNode = TargetFile.DocumentElement.FirstChild
Do Until currNode Is Nothing%>
<%= currNode.InnerXml %>
<% currNode = currNode.NextSibling()
Loop %>
概莫版对目标文件的属性并没有定义一个Schema，所以属性在模版中是作为一个XMLDocument。如果我们选择的XML文件如下所示：
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<?xml version="1.0" encoding="UTF-8"?>
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<Books>
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<Book>UML 2.0 In a Nutshell</Book>
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<Book>The Best Software Writing</Book>
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<Book>Coder to Developer</Book>
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<Book>Code Complete</Book>
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</Books>
生成后的代码：
Top-level nodes:
UML 2.0 In a Nutshell
The Best Software Writing
Coder to Developer
Code Complete
