| But built-in systems tend to be expensive, are not extensible, and may quickly be out of date. |
| Wall tissue is extensible when collagen fibers are folded, but nearly inextensible when collagen fibers near full extension. |
| That is, a concept is indefinitely extensible if any attempt to delineate the extension of the concept leads to an instance of the concept not so delineated. |
| But, the budgets are not extensible and some classes very expensive in cost and at time: so, do not jump this step. |
| For developers it provides an open, extensible and participative environment. |
| So extensible is viscous glass that it can be drawn out into a filament sufficiently fine and elastic to be woven into a fabric. |
