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Architecture

URIs or local files containing DAML are processed by the Windows or Unix daml2pdb application to produce a Palm Database (.pdb) file which is HotSync'd to the device using Palm Desktop. These are then used by the PalmDAML application running on the Palm.

Tutorial

Click on the PalmDAML application to start it.

PalmDAML initially displays a screen showing the number of records (unique resource URIs or literal values) in the loaded database.

Clicking Proceed will produce the Nodes View.

The Nodes View provides a list of the URIs for all resources referenced in the document. Because of limited space, only the file name and #reference portion of the URI is normally displayed. The arrows (when visible) allow you to scroll up and down the list a screen at a time.

Clicking on a URI provides a Node View showing all of the statements involving that node.

The Node View consists of 3 areas:

• the top area gives the full URI for the node, wrapping if necessary
• the middle area shows all of the statements involving the specified URI.
  • Each statement is of the form property arrow value
  • Statements marked with a forward arrow (>) are those where the URI at the top is the subject and value is the object
  • Statements marked with a reverse arrow (<) are those where the URI at the top is the object and value is the subject
• the bottom area provides full details on the statement selected in the middle window, wrapping if necessary

• You can click on entries in the middle area to open a Node View on the indicated node.
• You can navigate among the statements in the middle window using the Scroll buttons(s).
• You can use the Back button (<) to return to the previous Node View, if any.
• You can use the Home button (^) to return to the Nodes View.

You can also click on the Find icon to search for a specific string prefix in a Literal or URI. There may be a noticeable delay while search a large DAML database.

This produces a list of matching nodes.

Clicking on a match results in a Node View of that match.

Installation Instructions

1. Download the PalmDAML.prc executable and a database such as homework.pdb.
2. Start Palm Desktop.
3. Click Install.
4. Click Add and select the downloaded PalmDAML.prc file.
5. Click Add and select the downloaded .pdb file.
6. Click Done.
7. HotSync your Palm.
8. On the Palm, select the Home/Applications icon and click All Categories.
9. Click PalmDAML.

Databases with large numbers of records can literally take hours to HotSync. The shareware PDBcruncher application can reduce this time by 100x. PDBcrunched versions of the databases are also provided below.

File	PDBcrunched File	Records	Kb	Description
PalmDAML.prc	N/A	N/A	23	PalmDAML application
homework.pdb	!homework.pdb	5143	567	collected results of DAML Homework Assignment 1
royal92.pdb	!royal92.pdb	14072	1437	genealogy of European royalty
call.pdb	!call.pdb	35355	3846	CALL Thesaurus
beer.pdb	!beer.pdb	73	9	beer ontology
wine.pdb	!wine.pdb	572	85	wine ontology
lifecycle.pdb	!lifecycle.pdb	1117	105	DAML Researchers, Tools, Lifecycle, and Signup
ontologies.pdb	!ontologies.pdb	1298	140	DAML Ontology Library summary
opencyc.pdb	!opencyc.pdb	11567	2276	OpenCyc

Creating Your Own Databases

You can download the daml2pdb.java program and a sample script to run it. daml2pdb requires Java 2 and RDF API.

Implementation Details

Possible Future Directions

• accommodate databases with more than 64K records
• accommodate records with more than 64K bytes
• develop a conduit to support filtering of DAML statements and incremental transfer of statements to/from the Palm.
• support the addition, modification, and deletion of DAML statements

Authors