Using X-query to retrieve information from collection

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1

We’ve got multiple schema’s defined within a collection.
With XQuery I have no problem retrieving data from multiple schema’s like this example shows

for $a in input()/article
return

{for $b in input()/book where $b/@id = $a/article/@book return $b}

{$a}

But I need the same sort of functionality from an X-Query, but don’t know how.

2

I don’t believe you can do this with X-Query; it only can process one doctype at a time.

In previous versions of Tamino you could define a node within the schema of one doctype that represented a link to a document (or node within a document) of a second doctype, and this allowed an X-Query to retrieve parts of related documents within a single query. However, while I don’t remember this functionality being dropped I can’t find any documentation for it in the current version. (I may just be looking in the wrong place.)

But I don’t understand your your assertion that you need this in X-Query. X-Query is just there for “backwards compatibility”, ie., so applications written for earlier Tamino versions will still work. If you’re trying to add new functionality you should be using XQuery in any case.

3

Okey, thanks for the response.

Currently I’m using a browsing cursor to retrieve a paged result. Is it possible to just replace the X-Query with XQuery ? Or do I need to make alterations?

cursor = new BrowseCursor(Convert.ToUInt16(ddResultSize.SelectedValue),_xql.ToString(),sl);

where the _xql.ToString() bit is the X-Query

Here is the part of the function that handles the response from tamino:

public void ParseResult(System.IO.Stream result) {

		next = 1;
		previous  = 1;
		position = 0;
		quantity = 0;
		
		try {
			XmlTextReader  rdr = new XmlTextReader(result);
			rdr.WhitespaceHandling = WhitespaceHandling.None;
			rdr.Namespaces = false;

			while  (rdr.Read()) {
				if (rdr.NodeType == XmlNodeType.Element) {
					switch(rdr.Name) {
						case  "xql:query":
							rdr.Read();
							xpath = rdr.Value;
							break;
						case  "ino:message":
							returnvalue = rdr.GetAttribute("ino:returnvalue"); 
							break;
						case  "ino:messageline":
							rdr.Read();
							errortext  = rdr.Value; 
							break;
						case  "ino:messagetext":
							rdr.Read();
							errortext  = rdr.Value; 
							break;
						case  "xq:result"	 : 
						case  "xql:result"   :
							rdr.Read();

							docs = new System.Collections.ArrayList();
							if (singular) 
							{
								docs.Add(rdr.Value);
							}
							else 
							{
								doctype = rdr.Name;

								//								StringReader srdr = new StringReader(rdr.ReadOuterXml());
								//								XmlTextReader locrdr = new XmlTextReader(srdr);
								docs.Add(rdr.ReadOuterXml());

								while  (rdr.Name.Equals(doctype)) 
								{

									//									srdr = new StringReader(rdr.ReadOuterXml());
									//									locrdr = new XmlTextReader(srdr);
									docs.Add(rdr.ReadOuterXml());
								}
							}
							break;
						case  "ino:current":
								position = int.Parse(rdr.GetAttribute("ino:position"));
								quantity = int.Parse(rdr.GetAttribute("ino:quantity"));

								break;
						case "ino:next":
								next = int.Parse(rdr.GetAttribute("ino:position"));
								break;
						case "ino:prev": 						
								previous = int.Parse(rdr.GetAttribute("ino:position"));
								break;
					}
				}
				
			
					
			}

		}
		catch(Exception e) {
			Console.WriteLine(e.StackTrace);
		}
		finally {
			result.Close();
		}
	}

}