View source for Example markup for nested models

__NOTOC__
Describe Example markup for nested models here.
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<pre><nowiki>

<?xml version="1.0" encoding="utf-8" ?>
<html
	xmlns="http://www.w3.org/1999/xhtml"
	xmlns:br="http://www.x-port.net/bindingresolver/"
	xmlns:xf="http://www.w3.org/2002/xforms"
	xmlns:sxf="http://www.w3.org/2008/simplexforms"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
>
	<head>
		<title>Simple XForms</title>
	</head>

	<body>
		<h1>Example of nested model syntax...</h1>
				
		<!-- consume generic flight info service and adapt to our airline and set defaults
		     appropriate to common usage, e.g. today's date, our airline, etc -->
		
		<xf:model id="AA_flight_info_service">
			<xf:instance id="AA_defaults">  
				<instanceData xmlns="">
					<datename>Today</datename>
					<date/>
					<departure_city/>
					<arrival_city/>
					<flight_no/>
					<locator_code/>
				</instanceData>
			</xf:instance>
			
			<!-- set up query parms using context info to simplify data entry from mobile device:
				today's date
				current location, if available from GPS or other accessible locator info
				default carrier 
				locator code checksum for quick validation -->
				
			<xf:bind nodeset="instance('')/time" calculate="now()" />
			<xf:bind nodeset="instance('AA_defaults')/departure_city" calculate="...LatLongToCity(GPScoord())..."/>
			<xf:bind nodeset="instance('AA_defaults')/locator_code" constraint="...AA locator checksum..."/>
			<xf:bind nodeset="instance('AA_defaults')/date" calculate="...dateFromDatename(../datename)..."/>
			
			<xf:instance id="offered_dates">	
				<instanceData xmlns="">
					<dates>
			      		<date>Today</date>
			      		<date>Tomorrow</date>
			      		<date>Yesterday</date>
			      	</dates>
			   	</instanceData>
			</xf:instance>
			
			<xf:instance id="valid_arrival_cities">
				<instanceData xmlns="">
					<city/>  <!-- computed once we have a departure city...looks up AA routes from that city -->
				</instanceData>
			</xf:instance>
			<xf:bind nodeset="arrival_city" relevant="../departure_city <> '' "/>
			<!-- add web service lookup for valid arrival cities below... -->
			
			<xf:submission id="AA_query" />  
			<!-- want to be able to set parms and redirect to submodel submission, maybe after doing our own web service invocation to fill in values... -->			

			<!-- wire up instance elements in the AA model to the underlying generic query service -->
			
			<!-- start and end dates are the same for the AA service...only does single date query -->
			<xf:bind nodeset="instance('query_parms')/start_date" calculate="instance('AA_defaults')/date"/>
			<xf:bind nodeset="instance('query_parms')/end_date" calculate="instance('AA_defaults')/date"/>
			
			<!-- time is always set to now() -->
			<xf:bind nodeset="instance('query_parms')/time" calculate="now()" />
			
			<!-- airline is always AA -->
			<xf:bind nodeset="instance('query_parms')/airline" calculate="AA" />
			
			<!-- would be nice if the following could be "linked" by reference from the AA instance, vs. copied -->
			
			<xf:bind nodeset="instance('query_parms')/departure_city" calculate="instance('AA_defaults')/departure_city" />
			<xf:bind nodeset="instance('query_parms')/arrival_city" calculate="instance('AA_defaults')/arrival_city" />
			<xf:bind nodeset="instance('query_parms')/flight_no" calculate="instance('AA_defaults')/flight_no" />
			<xf:bind nodeset="instance('query_parms')/locator" calculate="instance('AA_defaults')/locator" />
			
			<!------------------------------->

			<!-- this model corresponds to a generic flight info web service -->
			
			<xf:model id="flight_info_service">  
			
				<xf:instance id="query_parms">  
					<instanceData xmlns="">
						<start_date/>			<!-- start date for flight queries, required -->
						<end_date/>			<!-- end date for flight queries, required -->
						<time/>				<!-- if provided, find flights near this time -->
						<airline/>			<!-- required -->
						<departure_city/>		<!-- one of departure city or arrival city must be filled in if locator_code and flight_no are blank --> 
						<arrival_city/>			
						<locator_code/>			<!-- if provided, search for flights in this specific reservation -->
						<flight_no/>			<!-- if provided, override time preference -->
					</instanceData>
				</xf:instance>
				
				<xf:instance id="search_results">
					<flights>
						<flight_no/>
						<departure_datetime/>	<!-- ISO datetime -->
						<arrival_datetime/>	<!-- ISO datetime -->
						<departure_city/>
						<arrival_city/>
					</flights>
				</xf:instance>
				
				<xf:submission id="submit1" method="..." action="..." />
			</xf:model>		
			
		</xf:model>	
		
		<!-- model as generated -->
		
		
		<!-- UI using generated model -->

		<xf:group model="AA_flight_info_service"> 
			
			<xf:input ref="departure_city">
				<xf:label>Departure City:</xf:label>
			</xf:input>
			
			<xf:select1 ref="instance('AA_flight_info_service')/arrival_city">
				<xf:label>Arrival City:</xf:label>
				<xf:itemset nodeset="instance('valid_arrival_cities')/city">
					<xf:label ref="."/>
					<xf:value ref="."/>
				</xf:itemset>
			</xf:select1>
			
			<xf:select1 ref="instance('AA_flight_info_service')/datename">
				<xf:label>Date</xf:label>
				<xf:itemset nodeset="instance('offered_dates')/date">
					<xf:label ref="."/>
					<xf:value ref="."/>
				</xf:itemset>
			</xf:select1>
			
			<xf:submit submission="AA_query">
				<xf:label>Search</xf:label>
			</xf:submit>
						
		</xf:group>	

	</body>
</html>

</nowiki></pre>

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