From 328cfbabc3181f9675a4f1519e6abacc36777d3c Mon Sep 17 00:00:00 2001
From: "waterson%netscape.com" <waterson%netscape.com>
Date: Mon, 26 Apr 1999 18:45:14 +0000
Subject: [PATCH] Added nsIRDFContainer and nsIRDFContainerUtils.

---
 rdf/base/idl/nsRDFInterfaces.idl | 66 ++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/rdf/base/idl/nsRDFInterfaces.idl b/rdf/base/idl/nsRDFInterfaces.idl
index 5def9708191d..c1493505ac17 100644
--- a/rdf/base/idl/nsRDFInterfaces.idl
+++ b/rdf/base/idl/nsRDFInterfaces.idl
@@ -325,3 +325,69 @@ interface nsIRDFService : nsISupports {
     // be initialized via <tt>nsIRDFDataSource::Init()</tt>.
     nsIRDFDataSource GetDataSource(in string aURI);
 };
+
+
+// A wrapper for manipulating RDF containers
+[scriptable, uuid(D4214E90-FB94-11D2-BDD8-00104BDE6048)]
+interface nsIRDFContainer : nsISupports {
+
+    // Initialize the container wrapper to the specified resource
+    // using the specified datasource for context.
+    void Init(in nsIRDFDataSource aDataSource, in nsIRDFResource aContainer);
+
+    // Return the number of elements in the container. Note that this
+    // may not always be accurate due to aggregation.
+    long GetCount();
+
+    // Return an enumerator that can be used to enumerate the contents
+    // of the container in ascending order.
+    nsISimpleEnumerator GetElements();
+
+    // Append an element to the container, assigning it the next
+    // available ordinal.
+    void AppendElement(in nsIRDFNode aElement);
+
+    // Remove the first occurence of the specified element from the
+    // container.
+    void RemoveElement(in nsIRDFNode aElement, in boolean aRenumber);
+    void InsertElementAt(in nsIRDFNode aElement, in long aIndex, in boolean aRenumber);
+    long IndexOf(in nsIRDFNode aElement);
+};
+
+
+// Container utilities
+[scriptable, uuid(D4214E91-FB94-11D2-BDD8-00104BDE6048)]
+interface nsIRDFContainerUtils : nsISupports {
+    // Returns 'true' if the property is an RDF ordinal property.
+    boolean IsOrdinalProperty(in nsIRDFResource aProperty);
+
+    // Convert the specified index to an ordinal property.
+    nsIRDFResource IndexToOrdinalResource(in long aIndex);
+
+    // Convert the specified ordinal property into an index
+    long OrdinalResourceToIndex(in nsIRDFResource aOrdinal);
+
+    // Return 'true' if the specified resource is a container
+    boolean IsContainer(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+
+    // Return 'true' if the specified resource is a bag
+    boolean IsBag(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+
+    // Return 'true' if the specified resource is a sequence
+    boolean IsSeq(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+
+    // Return 'true' if the specified resource is an alternation
+    boolean IsAlt(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+
+    // Decorates the specified resource appropriately to make it
+    // usable as an empty bag in the specified data source.
+    nsIRDFContainer MakeBag(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+
+    // Decorates the specified resource appropriately to make it
+    // usable as an empty sequence in the specified data source.
+    nsIRDFContainer MakeSeq(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+
+    // Decorates the specified resource appropriately to make it
+    // usable as an empty alternation in the specified data source.
+    nsIRDFContainer MakeAlt(in nsIRDFDataSource aDataSource, in nsIRDFResource aResource);
+};