This section demonstrates how to create an application for < AppML > through the following four simple steps.
The next chapter will show you how to download < AppML > and start developing Web applications on your own computer. Create a file using the following Models (we recommend) save the file as Customers.xml in the subdirectory. The < appml > tag defines the model. The < datasource > tag defines the data source for the model. The < database > tag defines the database. The < connection > tag defines the link to the database. < sql > tag definition data query The < orderby > tag defines the default sort. The < query > tag defines a legal query filter. In the first < AppML > app, create a HTML page: Add cascading styles to your web page when executing e < AppML > app: Add a script to your web page to run < AppML > app: Example The < AppML > library contains a large number of functions. These functions can be called from your web page.
In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress. 4.2.1. 1.创建模型（Model） ¶
<appml>
<datasource>
<database>
<connection>Democonnection>
<sql>SELECT CustomerName,ContactName,City,Country FROM Customerssql>
<orderby>CustomerNameorderby>
database>
datasource>
<filters>
<query>
<field>CustomerNamefield>
query>
filters>
appml>
Model analysis ¶
4.2.2. two。 Create a WEB page ¶
Example ¶
My First Web Application
Customer
City
Country
Alfreds Futterkiste
Berlin
Germany
4.2.3. 3. Add Styl ¶
Example ¶
My First Web Application
Customer
City
Country
Alfreds Futterkiste
Berlin
Germany
4.2.4. 4. Add a script and then execute the application ¶
My First Web Application
Customer
City
Country
#CustomerName#
#City#
#Country#
4.2.5. Case analysis ¶
Principles, Technologies, and Methods of Geographic Information Systems
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