A computer-implemented method of parsing markup-language source data is described. The markup-language source data comprises a plurality of elements. A first portion of the elements is processed by interoperating with a symbol table to determine unique string objects associated with the elements of the first portion of the elements. A structure is recorded associated with the first portion of the elements collectively, including the determined unique string objects in association with the corresponding elements of the first portion. A second portion of the elements is processed, using the structure determined associated with the first portion of the elements, to determine the unique string objects associated with the elements of the second portion, without interoperating with the symbol table.