OQL SERF Transformation Example:Inline Hrefelement

begin template hrefInline (Class parent, Attribute href, Attribute hrefValue)

{

//find the metaclass whose instances are refered by xlink:href

define hrefClass(href) as

element(select a.attrType

from Attribute a, MetaClass c

where a.attrName = href.attrName and a.classDefinedIn = c );

// get all the attributes of the hrefClass and add to the parent class

define query attr(cl) as:

select m.localAttrList

from MetaClass c

where c = cl;

for all x in attr(hrefClass):

add_attribute ($parent, x.attrName, x.attrType);

//define the extent of class cl

define query extent(cl) as:

select obj

from obj in c;

// Update the attribute value

for all obj in extent($parent):

for all attr in attr(hrefClass):

obj.setValue($parent.attr, $parent.$href.attr);

// add all the Elements of hrefClass to parent

Define Elements(el) as:

select c.subElements

from MetaClass c

where c = el;

for all sub in elements(hrefClass):

addSubElement($parent, sub);

// Delete the href attribute from the parent class delete_attribute ($parent, $href);

delete_attribute($parent,$hrefValue);

}

end template hrefInline

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