[xml] Inserting XML Schema default attributes


I'm trying to inject default attributes into a document from an XML Schema
during parsing. I set up a validation context and set the
XML_SCHEMA_VAL_VC_I_CREATE option on it, which, if I understand the docs
correctly, tells the validator to create defaulted/fixed attributes if they
do not exist already. Then I inject the validation context into the parser
using "xmlSchemaSAXPlug()".

The schema document I use is

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
  <xsd:element name="a" type="AType"/>
  <xsd:complexType name="AType">
    <xsd:sequence minOccurs="4" maxOccurs="4">
      <xsd:element name="b" type="BType" />
  <xsd:complexType name="BType">
    <xsd:attribute name="hardy" type="xsd:string" default="hey" />

The document I parse is

<a><b hardy="ho"/><b/><b hardy="ho"/><b/></a>

The document validates. However, no default attributes are inserted,
neither with my code nor with xmllint (which doesn't seem to support that
anyway). When I debug into the validator code in xmlschemas.c, I get to
line 25351 (libxml2 2.7.3):

    * Get the owner element; needed for creation of default attributes.
    * This fixes bug #341337, reported by David Grohmann.
    if (vctxt->options & XML_SCHEMA_VAL_VC_I_CREATE) {
        xmlSchemaNodeInfoPtr ielem = vctxt->elemInfos[vctxt->depth];
==>     if (ielem && ielem->node && ielem->node->doc)
            defAttrOwnerElem = ielem->node;

but "ielem->node" is NULL every time it gets there, so this doesn't fly.

Is there anything else I have to do to make this work?



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