ensure consistency within the schema. For example, there could be a list of words that are excluded from the names, e.g., :and:, "of" ..., or words that appear only in a particular order (i.e., 'Net' or 'Total' at the end of the label after a comma). In the label linkbase, elements are connected to human readable labels using "concept-label" arcrole. As mentioned above, elements can be assigned to labels in different languages. An example that describes definitions of labels of the IFRS element AssetsTotal in English, German and Polish is provided below. <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ifrs_AssetsTotal_lbl" xml:lang="en">Assets, Total</label> <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ifrs_AssetsTotal_lbl" xml:lang="de">Vermögenswerte, Gesamt</label> <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ifrs_AssetsTotal_lbl" xml:lang="pl">Aktywa, Razem</label> To distinguish between languages, XBRL uses the XML attribute lang. Taxonomy creators may also define different labels for one element. One of the ideas of XBRL is that the information about the period and currency for which the element is reported is not contained within an element definition but is described by a context in instance documents. In financial reporting on the other hand, many terms express the date for which they are being reported, for instance Property, Plant and Equipment at the beginning of year and Property, Plant and Equipment at the end of year. XBRL allows the creation of different labels depending on the context in which an element will be used. <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ifrs_AssetsTotal_lbl" xml:lang="en">Property, Plant and Equipment, Net</label> <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="ifrs_AssetsTotal_lbl" xml:lang="en">Property, Plant and Equipment, Net, Beginning Balance</label> <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="ifrs_AssetsTotal_lbl" xml:lang="en">Property, Plant and Equipment, Net, Ending Balance</label> The example above shows how three different labels are assigned to one element by applying different role attributes on labels. Reference Linkbase This linkbase associates concepts with citations of some body of authoritative literature. Financial concepts appearing on business reports more often than not stem from regulatory documents issued by authorities. For example, the IFRS Taxonomy describes financial reports prepared based on IFRSs (Bound Volume). Elements defined by this taxonomy refer to the specific terms and concepts explained in the standards. For this reason, a taxonomy is often provided with a reference linkbase that presents relationships between elements and external regulations or standards (the other solution is to enclose documentation in label linkbase). This helps instance creators and users understand the intended meaning of each element and provides support for its inclusion in the taxonomy. The reference layer does not contain the full text of