Link Descriptor (LNDESC)

A Link Descriptor (LNDESC) element holds a link to documents and external resources. Both external documents and draft drawing elements can be referenced using a LNDESC.

A Link Descriptor has the following attributes:

• NAME - user-defined name of the LNDESC element.

• DESC - description of the element.

• LNKURL - a string storing raw Uniform Resource Locator of the linked document.

• It can be for example a file ("file:///Docsys/ProjectX/MyDocument.doc"), a web page ("http://www.aveva.com"), an e-mail address ("mailto:support@aveva.com") or any other external resource. If it is an internal database reference (for example, to a drawing) it is stored in a form "dabref://=12345/6789".

The following pseudo attributes may be queried:

• LNKREF - if the Link Descriptor holds a reference to an internal database element,that means,. the LNKURL stores a "dabref://…" link, this attribute returns a reference to a database element linked through this descriptor. Otherwise, LNKREF returns a null reference. It is also possible to store an internal reference through this attribute.

• URL - this attribute returns merely the value of LNKURL but its main purpose is that you can assign either an external URL or a string with reference number of a Dabacon element, which is automatically recognised and stored as an internal link.

• LNKCLS - list of Link Class elements that classify this Link Descriptor.

• LNKELE - list of elements that have this Link Descriptor assigned.