In order to the software and web measurement field becomes a more robust engineering discipline it is mandatory to start reaching a common agreement between researchers and other stakeholders about primitive concepts such as attribute, metric, measure, measurement and calculation method, scale, elementary and global indicator, measurable concept, among others. There are various useful recent-issued ISO standards related to software quality models, measurement and evaluation processes, however, we observe sometimes a lack of a sound consensus among the same terms in different documents or sometimes absent terms. In this work we present a semiformal ontology for software metrics and indicators -based as much as possible on the concepts of those standards, which can be useful to support different assurance processes, methods and tools in addition to be the foundation for our cataloging web system [12]. Without sound and consensuated definitions it is difficult to assure metadata consisten...