The definition of urban form and its elements raises a wide debate in urban morphology. This study presents a proposal to understand the structuring of the urban landscape of Setif City over 170 years (1848-2018) by abstracting its main elements into permanent structure (PS_UL). It corresponds to the street network, more static to the change of the town plan, and flexible structure (FS_UL), more resilient to change and explains the superimpositions of morphological components (plot, building, and land use). This work aims to identify typological patterns of structures suggested in space-time through the inspection of the growth of the street network and the filling of morphological layers framed by the concept of urbanity. The methodology is based on syntactic (diachronic) morphogenetic analysis, with statistical analyses as unsupervised classification. Results indicate that PS_UL presents an accumulation of microincrements produced with a similar degree of coherence in different urban fabrics, which explain the local patterns of street network structuring. The typology of FS_UL patterns indicates an unbalanced growth by the arrangement between morphological elements, resulting in a variation in the degree of urbanity.

城市形态及其要素的定义引发了城市形态学的广泛争论。_{本研究提出了一项建议，通过将其主要元素抽象为永久结构 (PS UL} ) ，了解 170 多年来（1848-2018 年）塞提夫市城市景观的结构。对应街道网络，更静态对应城镇规划变化，结构灵活（FS _UL)，对变化更具弹性，并解释了形态成分（地块、建筑和土地利用）的叠加。这项工作旨在通过检查街道网络的增长和城市性概念框架下形态层的填充来识别时空建议的结构类型模式。该方法基于句法（历时）形态发生分析，将统计分析作为无监督分类。结果表明，PS _UL呈现出在不同城市结构中以相似程度的连贯性产生的微增量的积累，这解释了街道网络结构的局部模式。FS _UL的类型模式表明形态元素之间的排列不平衡，导致城市化程度的变化。