Gets the content of a documents links dictionary.
GET <webiURL>/documents/{documentId}/links
Where:
Response type: application/xml or application/json
Response body: a series of <link> identified by <id> and <name>.
GET <webiURL>/documents/8022/links
<links> <link dataType="String" qualification="Dimension"> <id>LB</id> <name>Category</name> </link> <link dataType="String" qualification="Dimension"> <id>L8</id> <name>City</name> </link> ... <link dataType="String" qualification="Dimension"> <id>L6</id> <name>Year</name> </link> </links>