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TheXmlRole element allows you to specify a role for anXmlListModel.More...
| Since: | Qt 4.7 |
See alsoQtDeclarative.
Defines whether this is a key role.
Key roles are used to to determine whether a set of values should be updated or added to the XML list model whenXmlListModel::reload() is called.
See alsoXmlListModel.
The name for the role. This name is used to access the model data for this role.
For example, the following model has a role named "title", which can be accessed from the view's delegate:
XmlListModel {id:xmlModel// ...XmlRole {name:"title"query:"title/string()" }}
ListView {model:xmlModeldelegate:Text {text:title }}
The relative XPath expression query for this role. The query must be relative; it cannot start with a '/'.
For example, if there is an XML document like this:
<?xml version="1.0" encoding="iso-8859-1" ?><catalogue> <book type="Hardcover"> <title>C++ GUI Programming with Qt 4</title> <year>2006</year> <author>Jasmin Blanchette</author> <author>Mark Summerfield</author> </book> <book type="Paperback"> <title>Programming with Qt</title> <year>2002</year> <author>Matthias Kalle Dalheimer</author> </book> </catalogue>
Here are some valid XPath expressions forXmlRole queries on this document:
XmlListModel {id:model ...// XmlRole queries will be made on <book> elementsquery:"/catalogue/book"// query the book titleXmlRole {name:"title";query:"title/string()" }// query the book's yearXmlRole {name:"year";query:"year/number()" }// query the book's type (the '@' indicates 'type' is an attribute, not an element)XmlRole {name:"type";query:"@type/string()" }// query the book's first listed author (note in XPath the first index is 1, not 0)XmlRole {name:"first_author";query:"author[1]/string()" }}
See theW3C XPath 2.0 specification for more information.
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