Virtual XML Garden
An implementation of XPath and XQuery for processing (and combining) many kinds of structured and formatted data as if it were all XML. (This is an ETTK technology.)
Date Posted: November 3, 2005
|
This is an  technology.
|
 |
|
|
|
The HTML file index.html in the Virtual-XML-Garden directory serves as the root of the documentation. | | |
|
The HTML file index.html serves as the root of the documentation.
| | |
|
XPath 1.0 is fully supported with the exception of the following functions:
- id($arg as xs:string*) as element()*
- id($arg as xs:string*, $node as node()) as element()*
- lang($testlang as xs:string) as xs:boolean
- lang($testlang as xs:string?, $node as node()) as xs:boolean
To be more precise, XPath 2.0 running in the XPath 1.0 compatibility mode is fully supported (with the exceptions above). However, only the functions defined in the XPath 1.0 specification are implemented.
XPath 2.0 is partially supported. Specifically, the following features are not yet implemented:
- intersect and except
- castable
- Functions not in XPath 1.0
- Data types not in XPath 1.0.
Notice that the support for XPath 2.0 is in the early stages and not yet very stable.
| | |
|
Please submit feedback through the discussion forum for Virtual XML Garden. | | |
|
XPath 1.0 is fully supported. (To be more precise, XPath 2.0 running in the XPath 1.0 compatibility mode is fully supported.)
XPath 2.0 is close to completely supported, following the public June 2006 draft specification from the W3C. Specifically, the following features are not yet implemented:
- The built-in types NOTATION, ENTITY, ENTITIES, and xs:language.
- Collations.
- Some standard functions: fn:round-half-to-even, fn:codepoint-equal, fn:normalize-unicode, fn:encode-for-uri, fn:iri-to-uri, fn:escape-html-uri, fn:in-scope-prefixes, fn:distinct-values, fn:deep-equal, fn:idref, fn:doc-available, fn:collection, and fn:implicit-timezone.
- Division of durations by durations.
| | |
|
Only limited support for XQuery 1.0 is provided. Specifically, the following features are supported:
- "where" constraints
- Computed and direct element constructor
- Computed attribute constructor
- Computed text constructor
- Global and internal variable declaration
- User-defined function (including recursive functions)
- Namespace declaration.
Since our implementation of XQuery 1.0 is based on the implementation of XPath 2.0, it is currently quite unstable. However, it should run simple queries, particularly those in the samples subdirectory.
| | |
|
XQuery 1.0 is partially supported, following the public June 2006 draft specification from the W3C. Our implementation includes the following optional features:
- Full axis feature.
- Module feature.
- Serialization feature except it does not accept any serialization parameters.
In addition to the missing XPath 2.0 features listed above, the following specifics are not yet implemented:
- Construction of processing-instructions.
- Types in let-expression bindings and variable declarations.
order by clauses of for expressions.Order, copy-namespace, and default namespace declarations.- Option declarations.
The XQuery implemenation is an experimental research prototype, so be aware that further limitations and problems may exist. | | |
|
Only the "Virtual XML" name space with some extension functions, as summarized in the Manual.html document.
| | |
|
The libraries in the lib subdirectory are external support libraries (see the notices.txt file for license details):
- resolver.jar, xercesImpl.jar, and xml-apis.jar, from the Apache Xerces, are used to provide a robust parser as well as some of the core XML APIs such as DOM and SAX.
- common.jar, ecore.jar, xsd.jar, and xsd.resources.jar, are the core components of the Eclipse XSD (XML Schema) support libraries.
| | |
|
Only the "Virtual XML" name space with some extension functions, as summarized in the Manual.html document. | | |
|
The libraries in the lib subdirectory are external support libraries (see the notices.txt file for license details):
- resolver.jar, xercesImpl.jar, and xml-apis.jar, from the Apache Xerces, are used to provide a robust parser as well as some of the core XML APIs such as DOM and SAX.
- common.jar, ecore.jar, xsd.jar, and xsd.resources.jar, are the core components of the Eclipse XSD (XML Schema) support libraries.
| | |
|
DFDL stands for the Data Format Description Language and is a proposed standard being developed by a similarly-named working group of the Global Grid Forum. DFDL-related parts of the release are in the samples/dfdl directory.
| | |
|
DFDL stands for the Data Format Description Language and is a proposed standard being developed by a similarly-named working group of the Global Grid Forum. DFDL-related parts of the release are in the samples/dfdl directory. | | |
|
More and more structured data is converted into XML documents anyway, either for transmission and processing that follow various standards, such as the Web service standards, or for combination with semi-structured document data in XHTML and similar formats. It is useful to start to "think XML" even for other forms of data in the enterprise. | | |
|
- Extensible Markup Language (XML) 1.0 (Third
Edition). Tim Bray, Jean Paoli, C.M. Sperberg-McQueen, Eve Maler, François Yergeau (editors). W3C Recommendation, February 2004.
- XML Information Set (Second Edition). John Cowan and Richard Tobin (editors). W3C Recommendation, February 2004.
- XQuery 1.0 and XPath 2.0 Data Model. Mary Fernández, Ashok Malhotra, Jonathan Marsh, Marton Nagy, and Norman Walsh (editors). W3C Candidate Recommendation, June 2006.
- XML Path Language (XPath) 2.0. Anders Berglund, Scott Boag, Don Chamberlin, Mary Fernández, Michael Kay, Jonathan Robie, and Jérôme Siméon (editors). W3C Candidate Recommendation, June 2006.
- XML Path Language (XPath) Version 1.0. James Clark and Steve DeRose. W3C Recommendation, November, 1999.
- XQuery 1.0: An XML Query Language. Scott
Boag, Don Chamberlin, Mary Fernández, Daniela Florescu, Jonathan Robie, and Jérôme Siméon (editors). W3C Candidate Recommendation, June 2006.
- Data Format Description Language. Martin Westhead, Mike Beckerle, and Jim Myers (chairs). Working document(s) of the Global Grid Forum working group.
- Service Data Objects specifications (SDO). Contributors: BEA Systems, IBM, Oracle, SAP AG, Siebel Systems, Sybase, Xcalia.
| |
|
|
|
|
| |
