diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
index 93f3d350a..c7ea92444 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
@@ -53,6 +53,7 @@ import org.hl7.fhir.exceptions.NoTerminologyServiceException;
 import org.hl7.fhir.exceptions.TerminologyServiceException;
 import org.hl7.fhir.r5.conformance.ProfileUtilities;
 import org.hl7.fhir.r5.context.CanonicalResourceManager.CanonicalResourceProxy;
+import org.hl7.fhir.r5.context.IWorkerContext.PackageVersion;
 import org.hl7.fhir.r5.context.IWorkerContext.ILoggingService.LogCategory;
 import org.hl7.fhir.r5.context.TerminologyCache.CacheToken;
 import org.hl7.fhir.r5.model.BooleanType;
@@ -159,7 +160,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
   }
 
   private Object lock = new Object(); // used as a lock for the data that follows
-  protected String version;
+  protected String version; // although the internal resources are all R5, the version of FHIR they describe may not be 
   private String cacheId;
   private boolean isTxCaching;
   private Set<String> cached = new HashSet<>();
@@ -266,10 +267,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     }
   }
   
-  public void cachePackage(PackageVersion packageDetails, List<PackageVersion> dependencies) {
-    // nothing yet
-  }
-
+  
   public void cacheResource(Resource r) throws FHIRException {
     cacheResourceFromPackage(r, null);  
   }
@@ -1317,6 +1315,65 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     }
   }
 
+  public PackageVersion getPackageForUrl(String uri) {
+    if (uri == null) {
+      return null;
+    }
+    uri = ProfileUtilities.sdNs(uri, getOverrideVersionNs());
+
+    synchronized (lock) {
+
+      String version = null;
+      if (uri.contains("|")) {
+        version = uri.substring(uri.lastIndexOf("|")+1);
+        uri = uri.substring(0, uri.lastIndexOf("|"));
+      }
+      if (uri.contains("#")) {
+        uri = uri.substring(0, uri.indexOf("#"));
+      } 
+      if (structures.has(uri)) {
+        return structures.getPackageInfo(uri, version);
+      }        
+      if (guides.has(uri)) {
+        return guides.getPackageInfo(uri, version);
+      } 
+      if (capstmts.has(uri)) {
+        return capstmts.getPackageInfo(uri, version);
+      } 
+      if (measures.has(uri)) {
+        return measures.getPackageInfo(uri, version);
+      } 
+      if (libraries.has(uri)) {
+        return libraries.getPackageInfo(uri, version);
+      } 
+      if (valueSets.has(uri)) {
+        return valueSets.getPackageInfo(uri, version);
+      } 
+      if (codeSystems.has(uri)) {
+        return codeSystems.getPackageInfo(uri, version);
+      } 
+      if (operations.has(uri)) {
+        return operations.getPackageInfo(uri, version);
+      } 
+      if (searchParameters.has(uri)) {
+        return searchParameters.getPackageInfo(uri, version);
+      } 
+      if (plans.has(uri)) {
+        return plans.getPackageInfo(uri, version);
+      } 
+      if (maps.has(uri)) {
+        return maps.getPackageInfo(uri, version);
+      } 
+      if (transforms.has(uri)) {
+        return transforms.getPackageInfo(uri, version);
+      } 
+      if (questionnaires.has(uri)) {
+        return questionnaires.getPackageInfo(uri, version);
+      }         
+      return null;
+    }
+  }
+  
   @SuppressWarnings("unchecked")
   public <T extends Resource> T fetchResourceWithException(String cls, String uri, CanonicalResource source) throws FHIRException {
     if (uri == null) {
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/CanonicalResourceManager.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/CanonicalResourceManager.java
index efa9d4619..73b60a05e 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/CanonicalResourceManager.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/CanonicalResourceManager.java
@@ -292,6 +292,20 @@ public class CanonicalResourceManager<T extends CanonicalResource> {
     return map.containsKey(url) ? map.get(url).getResource() : null;
   }
   
+  public PackageVersion getPackageInfo(String system, String version) {
+    if (version == null) {
+      return map.containsKey(system) ? map.get(system).getPackageInfo() : null;
+    } else {
+      if (map.containsKey(system+"|"+version))
+        return map.get(system+"|"+version).getPackageInfo();
+      String mm = VersionUtilities.getMajMin(version);
+      if (mm != null && map.containsKey(system+"|"+mm))
+        return map.get(system+"|"+mm).getPackageInfo();
+      else
+        return null;
+    }
+  }
+  
   public boolean has(String url) {
     return map.containsKey(url);
   }
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
index 5155a60a0..fd3b1c84e 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/IWorkerContext.java
@@ -170,6 +170,27 @@ public interface IWorkerContext {
     }
   }
 
+  public class PackageDetails extends PackageVersion {
+    private String name;
+    private String canonical;
+    private String web;
+    public PackageDetails(String id, String version, String name, String canonical, String web) {
+      super(id, version);
+      this.name = name;
+      this.canonical = canonical;
+      this.web = web;
+    }
+    public String getName() {
+      return name;
+    }
+    public String getCanonical() {
+      return canonical;
+    }
+    public String getWeb() {
+      return web;
+    }
+    
+  }
   public interface ICanonicalResourceLocator {
     void findResource(Object caller, String url); // if it can be found, put it in the context
   }
@@ -387,7 +408,7 @@ public interface IWorkerContext {
    *  
    * @param packageInfo
    */
-  public void cachePackage(PackageVersion packageDetails, List<PackageVersion> dependencies);
+  public void cachePackage(PackageDetails packageDetails, List<PackageVersion> dependencies);
   
   // -- profile services ---------------------------------------------------------
   
@@ -779,10 +800,14 @@ public interface IWorkerContext {
    */
    int loadFromPackageAndDependencies(NpmPackage pi, IContextResourceLoader loader, BasePackageCacheManager pcm) throws FileNotFoundException, IOException, FHIRException;
 
-  public boolean hasPackage(String id, String ver);
+   public boolean hasPackage(String id, String ver);
+   public boolean hasPackage(PackageVersion pack);
+   public PackageDetails getPackage(PackageVersion pack);
 
   public int getClientRetryCount();
   public IWorkerContext setClientRetryCount(int value);
   
   public TimeTracker clock();
+
+  public PackageVersion getPackageForUrl(String url);
 }
\ No newline at end of file
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
index 0eaabce29..e3796e404 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/SimpleWorkerContext.java
@@ -54,6 +54,7 @@ import org.hl7.fhir.exceptions.FHIRFormatError;
 import org.hl7.fhir.r5.conformance.ProfileUtilities;
 import org.hl7.fhir.r5.conformance.ProfileUtilities.ProfileKnowledgeProvider;
 import org.hl7.fhir.r5.context.CanonicalResourceManager.CanonicalResourceProxy;
+import org.hl7.fhir.r5.context.IWorkerContext.PackageVersion;
 import org.hl7.fhir.r5.context.IWorkerContext.ILoggingService.LogCategory;
 import org.hl7.fhir.r5.context.SimpleWorkerContext.PackageResourceLoader;
 import org.hl7.fhir.r5.formats.IParser;
@@ -810,15 +811,6 @@ public class SimpleWorkerContext extends BaseWorkerContext implements IWorkerCon
     this.progress = progress;
   }
 
-  @Override
-  public boolean hasPackage(String id, String ver) {
-    return loadedPackages.contains(id+"#"+ver);
-  }
-
-  public boolean hasPackage(String idAndver) {
-    return loadedPackages.contains(idAndver);
-  }
-
   public void setClock(TimeTracker tt) {
     clock = tt;
   }
@@ -837,5 +829,34 @@ public class SimpleWorkerContext extends BaseWorkerContext implements IWorkerCon
     }
    return xverManager;
   }
+  
+  public void cachePackage(PackageVersion packageDetails, List<PackageVersion> dependencies) {
+    // nothing yet
+  }
+
+  @Override
+  public boolean hasPackage(String id, String ver) {
+    return loadedPackages.contains(id+"#"+ver);
+  }
+
+  public boolean hasPackage(String idAndver) {
+    return loadedPackages.contains(idAndver);
+  }
+
+  @Override
+  public void cachePackage(PackageDetails packageDetails, List<PackageVersion> dependencies) {
+    // TODO Auto-generated method stub    
+  }
+
+  @Override
+  public boolean hasPackage(PackageVersion pack) {
+    return false;
+  }
+
+  @Override
+  public PackageDetails getPackage(PackageVersion pack) {
+    return null;
+  }
+
 }