This function returns the content of a document as
an object of type
hw_api_content
. The parameter array contains the required elements
'objectidentifier' and the optional element 'mode'. The mode
can be one of the constants HW_API_CONTENT_ALLLINKS,
HW_API_CONTENT_REACHABLELINKS or HW_API_CONTENT_PLAIN.
HW_API_CONTENT_ALLLINKS means to insert all anchors even if the
destination is not reachable. HW_API_CONTENT_REACHABLELINKS
tells
hw_api_content()
to insert only reachable links and HW_API_CONTENT_PLAIN will
lead to document without any links.