AW: [xml] Default Values for Attributes

["Buchcik, Kasimier" <k buchcik 4commerce de>]

Hi, 

> -----Ursprüngliche Nachricht-----
> Auftrag von David Grohmann
> 
> Using the Tree API is there a way to get at the default value 
> listed in 
> the XML Schema for an optional attribute that was not included in the 
> xml document?
> Reading through the libxml2 website it seems this can be done 
> with the 
> xmlreader API (and even then maybe only for DTDs, it is unclear)
> 
> example: schema
> <xs:element name = "root_element">
>     <xs:attribute  name = "prop1" use="optional" default="5">
> </xs:element>
> =====================
> Xml document
> <root_element>
> 
> xmlNode* node = magic_code_to_get_that_root_node();
> 
> xmlChar *myAttribute = xmlGetProp(node, "prop1") <= this wont 
> work, is 
> it possible some other way?

This is currently only possible during a validation episode:
In xmlschemas.c there's xmlSchemaSetValidOptions() to be used
with a validation context. Setting the option
XML_SCHEMA_VAL_VC_I_CREATE will create such default attribute-nodes
in the tree, while the validation is performed.

Regards,

Kasimier