Hi Mauro, As you've already discovered there are many ways to enable schema validation. If you have no particular reason to use the others I recommend the JAXP 1.3 Validation API [1] methods. The samples [2][3] distributed with Xerces demonstrate correct usage. Regardless of how you enable schema validation you must always use a namespace aware parser, so setting dbf.setNamespaceAware(true) is essential.
If you've got everything set up correctly and its still doesn't work for you based on what you wrote it would seem to be because you're expecting the getElementById() [4] method to do something it doesn't. Specifically the method "returns the Element that has an ID attribute with the given value" so if the declared type of an element is "xs:ID" you won't find it this way. Thanks. [1] http://xerces.apache.org/xerces2-j/javadocs/api/javax/xml/validation/package-summary.html [2] http://xerces.apache.org/xerces2-j/samples-jaxp.html#ParserAPIUsage [3] http://xerces.apache.org/xerces2-j/samples-jaxp.html#SourceValidator [4] http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#ID-getElBId Michael Glavassevich XML Parser Development IBM Toronto Lab E-mail: [EMAIL PROTECTED] E-mail: [EMAIL PROTECTED] Mauro Molinari <[EMAIL PROTECTED]> wrote on 05/26/2008 07:03:41 AM: > All all! > I'm new to XML development. After struggling for HOURS, I then decided > to ask for help... > > I've the following problem. I've written a simple XSD and a simple XML > that uses that XSD (no DTD defined for that XML). Both the XSD and the > XML are valid (verified with Eclipse). They are put in the same > directory and the XML references to the XSD through schemaLocation > attribute and specifies the relative path to the XSD (i.e.: just its > filename). > I'm using JDK 1.5.0 and I need to write a parser that reads the XML and > gets an element from it. This element is an attribute named "id" and of > type "xs:ID". > > My original code was the following: > > DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); > DocumentBuilder docb = dbf.newDocumentBuilder(); > Document doc = > docb.parse(getClass().getResourceAsStream(myXMLFileFullName)); > doc.getElementById("foo"); // (*) > > Problem #1: the statement at line (*) returns null, because the parser > does not recognize the element "id" as an ID. > Debugging my code, I found that the implementation uses XercesJ. > Searching with google I found this: > http://xerces.apache.org/xerces2-j/faq-dom.html#faq-13 > So, I modified my code as follows: > > DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); > dbf.setValidating(true); > dbf.setFeature("http://apache.org/xml/features/validation/schema";, > true); (**) > DocumentBuilder docb = dbf.newDocumentBuilder(); > Document doc = > docb.parse(getClass().getResourceAsStream(myXMLFileFullName)); > doc.getElementById("foo"); > > Apart from the fact that line (**) sounds to me like I've lost the > abstraction from the underlying implementation, anyway I can't get it to > work yet. The error I got is "cannot find definition for element 'bar'", > where <bar> is actually the root element of my XML, as defined in the > XSD. So, it seems it is not taking the XSD to do validation. > > After searching a lot I found lots of possible hints or "solutions", like: > > - setting on dbf the following attributes: > "http://java.sun.com/xml/jaxp/properties/schemaLanguage"; > to "http://www.w3.org/2001/XMLSchema"; and > "http://java.sun.com/xml/jaxp/properties/schemaSource"; to the full path > of my XSD: do I really need this? Aren't these attributes depending on > the underlying implementation? Isn't there a way to tell the parser to > pick up the XSD automatically, since its path is specified in the > schemaLocation attribute of the XML? Determining the actual full path to > the XSD could be not so simple... > > - setting on dbf the following attribute: > "http://java.sun.com/xml/jaxp/properties/schemaLanguage"; to > "http://www.w3.org/2001/XMLSchema";; this doesn't help > > - setting a Schema instance through dbf.setSchema, by creating a Schema > instance through SchemaFactory, created on my XSD file > > - adding dbf.setNamespaceAware(true); > > My problem is this: I can't get the whole thing to work and I can't > understand what I really need among all this stuff. I tried to follow > some examples I found on the net, but couldn't get it to work. Sometimes > the parser simply says it can't find the definition of 'bar' element, > sometimes it also says it can't locate the XSD. In any case, I can't get > getElementById to work. > > Any help would really be appreciated. > > Thank you in advance. > > -- > Mauro Molinari > Software Developer > [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED]
