I'm using the Xerces Java parser to validate XML instances againts XSD schemas.
In case of error (constraint violation), I need to provide information back to the user about the problem such as :
- value provided by the user,
- constraint violated,
- list of the facets of the object (min, max, nb of fractional digits, ...) and in addition, if possible, some (non native) attributes of the element.
Example :
Here is a complex type describing the properties an element must match :
<xsd:complexType name="hciRADIUS_ACC_THRES_T">
<xsd:simpleContent>
<xsd:restriction base="FloatDef_T">
<xsd:maxInclusive value="99.9"/>
<xsd:minInclusive value="1.0"/>
<xsd:fractionDigits value="1"/>
<xsd:attribute ref="label" fixed="Radius Acc Thres"/>
<xsd:attribute ref="continous" fixed="true"/>
<xsd:attribute name="precision" type="xsd:decimal" fixed="0.1"/>
</xsd:restriction>
</xsd:simpleContent>
</xsd:complexType>
Here is the corresponding element :
<xsd:element name="hciRADIUS_ACC_THRES" type="hciRADIUS_ACC_THRES_T">
When receiving the element "hciRADIUS_ACC_THRES" in an XML instance with value 120.33 for example :
<hciRADIUS_ACC_THRES>120.33</hciRADIUS_ACC_THRES>
I would like to retrieve information about the properties of the element type in order to send an error message back to the user, message which could be formatted as follow :
Radius Acc Thres error[info contained in attribute "label"] : value 120.33
Possible values : from 1.0[info contained in "minInclusive" facet] to 99.9[info contained in "maxInclusive" facet], number of fractional digits is 1[info contained in "fractionDigits" facet]...
My question are :
- Is it possible to do that using Xerces Java ? -> can anybody send me some code examples or tell me where to find them ?
- Should I use DOM Level 3 API ? PSVI ?
Thank you all
