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     ::DATATOOL:: Generated from "mmdb2.asn"
     ::DATATOOL:: by application DATATOOL version 1.8.1
     ::DATATOOL:: on 01/18/2007 23:07:18
     ============================================ -->

<!-- ============================================ -->
<!-- This section is mapped from module "MMDB-Structural-model"
================================================= -->

<!--
$Revision: 6.0 $
**********************************************************************

  Biological Macromolecule 3-D Structure Data Types for MMDB,
                A Molecular Modeling Database

  Definitions for structural models

  By Hitomi Ohkawa, Jim Ostell, Chris Hogue and Steve Bryant 

  National Center for Biotechnology Information
  National Institutes of Health
  Bethesda, MD 20894 USA

  July, 1996

**********************************************************************
-->

<!-- Elements used by other modules:
          Biostruc-model,
          Model-id,
          Model-coordinate-set-id -->

<!-- Elements referenced from other modules:
          Chem-graph-pntrs,
          Atom-pntrs,
          Chem-graph-alignment,
          Sphere,
          Cone,
          Cylinder,
          Brick,
          Transform FROM MMDB-Features,
          Biostruc-id FROM MMDB,
          Pub FROM NCBI-Pub -->
<!-- ============================================ -->

<!--
 A structural model maps chemical components into a measured three-
 dimensional space. PDB-derived biostrucs generally contain 4 models, 
 corresponding to "views" of the structure of a biomolecular assemble with 
 increasing levels of complexity.  Model types indicate the complexity of the
 view.  
 The model named "NCBI all atom" represents a view suitable for most 
 computational biology applications.  It provides complete atomic coordinate 
 data for a "single best" model, omitting statistical disorder information 
 and/or ensemble structure descriptions provided in the source PDB file.  
 Construction of the single best model is based on the assumption that the 
 contents of the "alternate conformation" field from pdb imply no correlation
 among the occupancies of multiple sites assigned to sets of atoms: the best 
 site is chosen only on the basis of highest occupancy. Note, however, that 
 alternate conformation sets where correlation is implied are generally 
 constrained in crystallographic refinement to have uniform occupancy, and 
 will thus be selected as a set. For ensemble models the model which assigns 
 coordinates to the most atoms is chosen.  If numbers of coordinates are the 
 same, the model occurring first in the PDB file is selected.  The single 
 best model includes complete coordinates for all nonpolymer components, but 
 omits those classified as "solvent".  Model type is 3 for this model. 
 The model named "NCBI backbone" represents a simple view intended for 
 graphic displays and rapid transmission over a network.  It includes only 
 alpha carbon or backbone phosphate coordinates for biopolymers. It is based 
 on selection of alpha-carbon and backbone phosphate atoms from the "NCBI
 all atom" model. The model type is set to 2.  An even simpler model gives 
 only a cartoon representation, using cylinders corresponding to secondary 
 structure elements.  This is named "NCBI vector", and has model type 1.
 The models named "PDB Model 1", "PDB Model 2", etc. represent the complete
 information provided by PDB, including full descriptions of statistical
 disorder.  The name of the model is based on the contents of the PDB MODEL
 record, with a default name of "PDB Model 1" for PDB files which contain 
 only a single model.  Construction of these models is based on the 
 assumption that contents of the PDB "alternate conformation" field are 
 intended to imply correlation among the occupancies of atom sets flagged by
 the same identifier.  The special flag " " (blank) is assumed to indicate 
 sites occupied in all alternate conformations, and sites flagged otherwise,
 together with " ", to indicate a distinct member of an ensemble of 
 alternate conformations.  Note that construction of ensemble members 
 according to these assumption requires two validation checks on PDB 
 "alternate conformation" flags: they must be unique among sites assigned to 
 the same atom, and that the special " " flag must occur only for unique
 sites.  Sites which violate the first check are flagged as "u", for 
 "unknown"; they are omitted from all ensemble definitions but are 
 nontheless retained in the coordinate list.  Sites which violate the second
 check are flagged "b" for "blank", and are included in an appropriately
 named ensemble.  The model type for pdb all models is 4.
 Note that in the MMDB database models are stored in the ASN.1 stream in
 order of increasing model type value.  Since models occur as the last item
 in a biostruc, parsers may avoid reading the entire stream if the desired
 model is one of the simplified types, which occur first in the stream. This
 can save considerable I/O time, particularly for large ensemble models from 
 NMR determinations.
-->
<!ELEMENT Biostruc-model (
        Biostruc-model_id, 
        Biostruc-model_type, 
        Biostruc-model_descr?, 
        Biostruc-model_model-space?, 
        Biostruc-model_model-coordinates?)>

<!ELEMENT Biostruc-model_id (Model-id)>

<!ELEMENT Biostruc-model_type (Model-type)>

<!ELEMENT Biostruc-model_descr (Model-descr*)>
<!--
 The model space defines measurement units and any external reference frame.
 Coordinates refer to a right-handed orthogonal system defined on axes 
 tagged x, y and z in the coordinate and feature definitions of a biostruc.
 Coordinates from PDB-derived structures are reported without change, in
 angstrom units.  The units of temperature and occupancy factors are not
 defined explicitly in PDB, but are inferred from their value range.
-->
<!ELEMENT Biostruc-model_model-space (Model-space)>

<!ELEMENT Biostruc-model_model-coordinates (Model-coordinate-set*)>


<!ELEMENT Model-id (%INTEGER;)>


<!ELEMENT Model-type (%INTEGER;)>
<!ATTLIST Model-type value (
        ncbi-vector |
        ncbi-backbone |
        ncbi-all-atom |
        pdb-model |
        other
        ) #IMPLIED >



<!ELEMENT Model-descr (
        Model-descr_name | 
        Model-descr_pdb-reso | 
        Model-descr_pdb-method | 
        Model-descr_pdb-comment | 
        Model-descr_other-comment | 
        Model-descr_attribution)>

<!ELEMENT Model-descr_name (#PCDATA)>

<!ELEMENT Model-descr_pdb-reso (#PCDATA)>

<!ELEMENT Model-descr_pdb-method (#PCDATA)>

<!ELEMENT Model-descr_pdb-comment (#PCDATA)>

<!ELEMENT Model-descr_other-comment (#PCDATA)>

<!ELEMENT Model-descr_attribution (Pub)>

<!--
 The model space defines measurement units and any external reference frame.
 Coordinates refer to a right-handed orthogonal system defined on axes 
 tagged x, y and z in the coordinate and feature definitions of a biostruc.
 Coordinates from PDB-derived structures are reported without change, in
 angstrom units.  The units of temperature and occupancy factors are not
 defined explicitly in PDB, but are inferred from their value range.
-->
<!ELEMENT Model-space (
        Model-space_coordinate-units, 
        Model-space_thermal-factor-units?, 
        Model-space_occupancy-factor-units?, 
        Model-space_density-units?, 
        Model-space_reference-frame?)>

<!ELEMENT Model-space_coordinate-units %ENUM;>
<!ATTLIST Model-space_coordinate-units value (
        angstroms |
        nanometers |
        other |
        unknown
        ) #REQUIRED >


<!ELEMENT Model-space_thermal-factor-units %ENUM;>
<!ATTLIST Model-space_thermal-factor-units value (
        b |
        u |
        other |
        unknown
        ) #REQUIRED >


<!ELEMENT Model-space_occupancy-factor-units %ENUM;>
<!ATTLIST Model-space_occupancy-factor-units value (
        fractional |
        electrons |
        other |
        unknown
        ) #REQUIRED >


<!ELEMENT Model-space_density-units %ENUM;>
<!ATTLIST Model-space_density-units value (
        electrons-per-unit-volume |
        arbitrary-scale |
        other |
        unknown
        ) #REQUIRED >

<!--
 An external reference frame is a pointer to another biostruc, with an 
 optional operator to rotate and translate coordinates into its model space.
 This item is intended for representation of homology-derived model 
 structures, and is not present for structures from PDB.
-->
<!ELEMENT Model-space_reference-frame (Reference-frame)>

<!--
 An external reference frame is a pointer to another biostruc, with an 
 optional operator to rotate and translate coordinates into its model space.
 This item is intended for representation of homology-derived model 
 structures, and is not present for structures from PDB.
-->
<!ELEMENT Reference-frame (
        Reference-frame_biostruc-id, 
        Reference-frame_rotation-translation?)>

<!ELEMENT Reference-frame_biostruc-id (Biostruc-id)>

<!ELEMENT Reference-frame_rotation-translation (Transform)>

<!--
 Atomic coordinates may be assigned literally or by reference to another
 biostruc.  The reference coordinate type is used to represent homology-
 derived model structures.  PDB-derived structures have literal coordinates.
 Referenced coordinates identify another biostruc, any transformation to be 
 applied to coordinates from that biostruc, and a mapping of the chemical
 graph of the present biostruc onto that of the referenced biostruc.  They
 give an "alignment" of atoms in the current biostruc with those in another,
 from which the coordinates of matched atoms may be retrieved.  For non-
 atomic models "alignment" may also be represented by molecule and residue
 equivalence lists.  Referenced coordinates are a data item inteded for 
 representation of homology models, with an explicit pointer to their source
 information. They do not occur in PDB-derived models.
-->
<!ELEMENT Model-coordinate-set (
        Model-coordinate-set_id?, 
        Model-coordinate-set_descr?, 
        Model-coordinate-set_coordinates)>

<!ELEMENT Model-coordinate-set_id (Model-coordinate-set-id)>

<!ELEMENT Model-coordinate-set_descr (Model-descr*)>

<!ELEMENT Model-coordinate-set_coordinates (
        Model-coordinate-set_coordinates_literal | 
        Model-coordinate-set_coordinates_reference)>
<!--
 Literal coordinates map chemical components into the model space.  Three 
 mapping types are allowed, atomic coordinate models, density-grid models,
 and surface models. A model consists of a sequence of such coordinate sets, 
 and may thus combine coordinate subsets which have a different source.  
 PDB-derived models contain a single atomic coordinate set, as they by
 definition represent information from a single source.
-->
<!ELEMENT Model-coordinate-set_coordinates_literal (Coordinates)>

<!ELEMENT Model-coordinate-set_coordinates_reference (Chem-graph-alignment)>


<!ELEMENT Model-coordinate-set-id (%INTEGER;)>

<!--
 Literal coordinates map chemical components into the model space.  Three 
 mapping types are allowed, atomic coordinate models, density-grid models,
 and surface models. A model consists of a sequence of such coordinate sets, 
 and may thus combine coordinate subsets which have a different source.  
 PDB-derived models contain a single atomic coordinate set, as they by
 definition represent information from a single source.
-->
<!ELEMENT Coordinates (
        Coordinates_atomic | 
        Coordinates_surface | 
        Coordinates_density)>
<!--
 Literal atomic coordinate values give location, occupancy and order
 parameters, and a pointer to a specific atom defined in the biostruc graph.
 Temperature and occupancy factors have their conventional crystallographic
 definitions, with units defined in the model space declaration.  Atoms,
 sites, temperature-factors, occupancies and alternate-conformation-ids
 are parallel arrays, i.e. the have the same number of values as given by
 number-of-points. Conformation ensembles represent distinct correlated-
 disorder subsets of the coordinates.  They will be present only for certain 
 "views" of PDB structures, as described above. Their derivation from PDB-
 supplied "alternate-conformation" ids is described below. 
-->
<!ELEMENT Coordinates_atomic (Atomic-coordinates)>
<!--
 Literal surface coordinates define the chemical components whose structure
 is described by a surface, and the surface itself.  The surface may be
 either a regular geometric solid or a triangle-mesh of arbitrary shape.
-->
<!ELEMENT Coordinates_surface (Surface-coordinates)>
<!--
 Literal density coordinates define the chemical components whose structure
 is described by a density grid, parameters of this grid, and density values.
-->
<!ELEMENT Coordinates_density (Density-coordinates)>

<!--
 Literal atomic coordinate values give location, occupancy and order
 parameters, and a pointer to a specific atom defined in the biostruc graph.
 Temperature and occupancy factors have their conventional crystallographic
 definitions, with units defined in the model space declaration.  Atoms,
 sites, temperature-factors, occupancies and alternate-conformation-ids
 are parallel arrays, i.e. the have the same number of values as given by
 number-of-points. Conformation ensembles represent distinct correlated-
 disorder subsets of the coordinates.  They will be present only for certain 
 "views" of PDB structures, as described above. Their derivation from PDB-
 supplied "alternate-conformation" ids is described below. 
-->
<!ELEMENT Atomic-coordinates (
        Atomic-coordinates_number-of-points, 
        Atomic-coordinates_atoms, 
        Atomic-coordinates_sites, 
        Atomic-coordinates_temperature-factors?, 
        Atomic-coordinates_occupancies?, 
        Atomic-coordinates_alternate-conf-ids?, 
        Atomic-coordinates_conf-ensembles?)>

<!ELEMENT Atomic-coordinates_number-of-points (%INTEGER;)>

<!ELEMENT Atomic-coordinates_atoms (Atom-pntrs)>
<!--
 The atoms whose location is described by each coordinate are identified
 via a hierarchical pointer to the chemical graph of the biomolecular
 assembly.  Coordinates may be matched with atoms in the chemical structure
 by the values of the molecule, residue and atom id's given here,  which 
 match exactly the items of the same type defined in Biostruc-graph.
 Coordinates are given as integer values, with a scale factor to convert 
 to real values for each x, y or z, in the units indicated in model-space.
 Integer values must be divided by the the scale factor.  This use of integer
 values reduces the ASN.1 stream size. The scale factors for temperature 
 factors and occupancies are given separately, but must be used in the same 
 fashion to produce properly scaled real values.
-->
<!ELEMENT Atomic-coordinates_sites (Model-space-points)>

<!ELEMENT Atomic-coordinates_temperature-factors (Atomic-temperature-factors)>

<!ELEMENT Atomic-coordinates_occupancies (Atomic-occupancies)>
<!--
 An alternate conformation id is optionally associated with each coordinate. 
 Aside from corrections due to the validation checks described above, the 
 contents of MMDB Alternate-conformation-ids are identical to the PDB 
 "alternate conformation" field.
-->
<!ELEMENT Atomic-coordinates_alternate-conf-ids (Alternate-conformation-ids)>

<!ELEMENT Atomic-coordinates_conf-ensembles (Conformation-ensemble*)>

<!--
 The atoms whose location is described by each coordinate are identified
 via a hierarchical pointer to the chemical graph of the biomolecular
 assembly.  Coordinates may be matched with atoms in the chemical structure
 by the values of the molecule, residue and atom id's given here,  which 
 match exactly the items of the same type defined in Biostruc-graph.
 Coordinates are given as integer values, with a scale factor to convert 
 to real values for each x, y or z, in the units indicated in model-space.
 Integer values must be divided by the the scale factor.  This use of integer
 values reduces the ASN.1 stream size. The scale factors for temperature 
 factors and occupancies are given separately, but must be used in the same 
 fashion to produce properly scaled real values.
-->
<!ELEMENT Model-space-points (
        Model-space-points_scale-factor, 
        Model-space-points_x, 
        Model-space-points_y, 
        Model-space-points_z)>

<!ELEMENT Model-space-points_scale-factor (%INTEGER;)>

<!ELEMENT Model-space-points_x (Model-space-points_x_E*)>


<!ELEMENT Model-space-points_x_E (%INTEGER;)>

<!ELEMENT Model-space-points_y (Model-space-points_y_E*)>


<!ELEMENT Model-space-points_y_E (%INTEGER;)>

<!ELEMENT Model-space-points_z (Model-space-points_z_E*)>


<!ELEMENT Model-space-points_z_E (%INTEGER;)>


<!ELEMENT Atomic-temperature-factors (
        Atomic-temperature-factors_isotropic | 
        Atomic-temperature-factors_anisotropic)>

<!ELEMENT Atomic-temperature-factors_isotropic (Isotropic-temperature-factors)>

<!ELEMENT Atomic-temperature-factors_anisotropic (Anisotropic-temperature-factors)>


<!ELEMENT Isotropic-temperature-factors (
        Isotropic-temperature-factors_scale-factor, 
        Isotropic-temperature-factors_b)>

<!ELEMENT Isotropic-temperature-factors_scale-factor (%INTEGER;)>

<!ELEMENT Isotropic-temperature-factors_b (Isotropic-temperature-factors_b_E*)>


<!ELEMENT Isotropic-temperature-factors_b_E (%INTEGER;)>


<!ELEMENT Anisotropic-temperature-factors (
        Anisotropic-temperature-factors_scale-factor, 
        Anisotropic-temperature-factors_b-11, 
        Anisotropic-temperature-factors_b-12, 
        Anisotropic-temperature-factors_b-13, 
        Anisotropic-temperature-factors_b-22, 
        Anisotropic-temperature-factors_b-23, 
        Anisotropic-temperature-factors_b-33)>

<!ELEMENT Anisotropic-temperature-factors_scale-factor (%INTEGER;)>

<!ELEMENT Anisotropic-temperature-factors_b-11 (Anisotropic-temperature-factors_b-11_E*)>


<!ELEMENT Anisotropic-temperature-factors_b-11_E (%INTEGER;)>

<!ELEMENT Anisotropic-temperature-factors_b-12 (Anisotropic-temperature-factors_b-12_E*)>


<!ELEMENT Anisotropic-temperature-factors_b-12_E (%INTEGER;)>

<!ELEMENT Anisotropic-temperature-factors_b-13 (Anisotropic-temperature-factors_b-13_E*)>


<!ELEMENT Anisotropic-temperature-factors_b-13_E (%INTEGER;)>

<!ELEMENT Anisotropic-temperature-factors_b-22 (Anisotropic-temperature-factors_b-22_E*)>


<!ELEMENT Anisotropic-temperature-factors_b-22_E (%INTEGER;)>

<!ELEMENT Anisotropic-temperature-factors_b-23 (Anisotropic-temperature-factors_b-23_E*)>


<!ELEMENT Anisotropic-temperature-factors_b-23_E (%INTEGER;)>

<!ELEMENT Anisotropic-temperature-factors_b-33 (Anisotropic-temperature-factors_b-33_E*)>


<!ELEMENT Anisotropic-temperature-factors_b-33_E (%INTEGER;)>


<!ELEMENT Atomic-occupancies (
        Atomic-occupancies_scale-factor, 
        Atomic-occupancies_o)>

<!ELEMENT Atomic-occupancies_scale-factor (%INTEGER;)>

<!ELEMENT Atomic-occupancies_o (Atomic-occupancies_o_E*)>


<!ELEMENT Atomic-occupancies_o_E (%INTEGER;)>

<!--
 An alternate conformation id is optionally associated with each coordinate. 
 Aside from corrections due to the validation checks described above, the 
 contents of MMDB Alternate-conformation-ids are identical to the PDB 
 "alternate conformation" field.
-->
<!ELEMENT Alternate-conformation-ids (Alternate-conformation-id*)>


<!ELEMENT Alternate-conformation-id (#PCDATA)>

<!--
 Correlated disorder ensemble is defined by a set of alternate conformation 
 id's which identify coordinates relevant to that ensemble. These are 
 defined from the validated and corrected contents of the PDB "alternate
 conformation" field as described above.  A given ensemble, for example, may
 consist of atom sites flagged by " " and "A" Alternate-conformation-ids. 
 Names for ensembles are constructed from these flags. This example would be
 named, in its description, "PDB Ensemble blank plus A".
 Note that this interpretation is consistent with common PDB usage of the 
 "alternate conformation" field, but that PDB specifications do not formally
 distinguish between correlated and uncorrelated disorder in crystallographic
 models. Ensembles identified in MMDB thus may not correspond to the meaning
 intended by PDB or the depositor.  No information is lost, however, and
 if the intended meaning is known alternative ensemble descriptions may be
 reconstructed directly from the Alternate-conformation-ids.
 Note that correlated disorder as defined here is allowed within an atomic 
 coordinate set but not between the multiple sets which may define a model. 
 Multiple sets within the same model are intended as a means to represent 
 assemblies modeled from different experimentally determined structures,
 where correlated disorder between coordinate sets is not relevant.
-->
<!ELEMENT Conformation-ensemble (
        Conformation-ensemble_name, 
        Conformation-ensemble_alt-conf-ids)>

<!ELEMENT Conformation-ensemble_name (#PCDATA)>

<!ELEMENT Conformation-ensemble_alt-conf-ids (Alternate-conformation-id*)>

<!--
 Literal surface coordinates define the chemical components whose structure
 is described by a surface, and the surface itself.  The surface may be
 either a regular geometric solid or a triangle-mesh of arbitrary shape.
-->
<!ELEMENT Surface-coordinates (
        Surface-coordinates_contents, 
        Surface-coordinates_surface)>

<!ELEMENT Surface-coordinates_contents (Chem-graph-pntrs)>

<!ELEMENT Surface-coordinates_surface (
        Surface-coordinates_surface_sphere | 
        Surface-coordinates_surface_cone | 
        Surface-coordinates_surface_cylinder | 
        Surface-coordinates_surface_brick | 
        Surface-coordinates_surface_tmesh | 
        Surface-coordinates_surface_triangles)>

<!ELEMENT Surface-coordinates_surface_sphere (Sphere)>

<!ELEMENT Surface-coordinates_surface_cone (Cone)>

<!ELEMENT Surface-coordinates_surface_cylinder (Cylinder)>

<!ELEMENT Surface-coordinates_surface_brick (Brick)>

<!ELEMENT Surface-coordinates_surface_tmesh (T-mesh)>

<!ELEMENT Surface-coordinates_surface_triangles (Triangles)>


<!ELEMENT T-mesh (
        T-mesh_number-of-points, 
        T-mesh_scale-factor, 
        T-mesh_swap, 
        T-mesh_x, 
        T-mesh_y, 
        T-mesh_z)>

<!ELEMENT T-mesh_number-of-points (%INTEGER;)>

<!ELEMENT T-mesh_scale-factor (%INTEGER;)>

<!ELEMENT T-mesh_swap (T-mesh_swap_E*)>


<!ELEMENT T-mesh_swap_E EMPTY>
<!ATTLIST T-mesh_swap_E value ( true | false ) #REQUIRED >


<!ELEMENT T-mesh_x (T-mesh_x_E*)>


<!ELEMENT T-mesh_x_E (%INTEGER;)>

<!ELEMENT T-mesh_y (T-mesh_y_E*)>


<!ELEMENT T-mesh_y_E (%INTEGER;)>

<!ELEMENT T-mesh_z (T-mesh_z_E*)>


<!ELEMENT T-mesh_z_E (%INTEGER;)>


<!ELEMENT Triangles (
        Triangles_number-of-points, 
        Triangles_scale-factor, 
        Triangles_x, 
        Triangles_y, 
        Triangles_z, 
        Triangles_number-of-triangles, 
        Triangles_v1, 
        Triangles_v2, 
        Triangles_v3)>

<!ELEMENT Triangles_number-of-points (%INTEGER;)>

<!ELEMENT Triangles_scale-factor (%INTEGER;)>

<!ELEMENT Triangles_x (Triangles_x_E*)>


<!ELEMENT Triangles_x_E (%INTEGER;)>

<!ELEMENT Triangles_y (Triangles_y_E*)>


<!ELEMENT Triangles_y_E (%INTEGER;)>

<!ELEMENT Triangles_z (Triangles_z_E*)>


<!ELEMENT Triangles_z_E (%INTEGER;)>

<!ELEMENT Triangles_number-of-triangles (%INTEGER;)>

<!ELEMENT Triangles_v1 (Triangles_v1_E*)>


<!ELEMENT Triangles_v1_E (%INTEGER;)>

<!ELEMENT Triangles_v2 (Triangles_v2_E*)>


<!ELEMENT Triangles_v2_E (%INTEGER;)>

<!ELEMENT Triangles_v3 (Triangles_v3_E*)>


<!ELEMENT Triangles_v3_E (%INTEGER;)>

<!--
 Literal density coordinates define the chemical components whose structure
 is described by a density grid, parameters of this grid, and density values.
-->
<!ELEMENT Density-coordinates (
        Density-coordinates_contents, 
        Density-coordinates_grid-corners, 
        Density-coordinates_grid-steps-x, 
        Density-coordinates_grid-steps-y, 
        Density-coordinates_grid-steps-z, 
        Density-coordinates_fastest-varying, 
        Density-coordinates_slowest-varying, 
        Density-coordinates_scale-factor, 
        Density-coordinates_density)>

<!ELEMENT Density-coordinates_contents (Chem-graph-pntrs)>

<!ELEMENT Density-coordinates_grid-corners (Brick)>

<!ELEMENT Density-coordinates_grid-steps-x (%INTEGER;)>

<!ELEMENT Density-coordinates_grid-steps-y (%INTEGER;)>

<!ELEMENT Density-coordinates_grid-steps-z (%INTEGER;)>

<!ELEMENT Density-coordinates_fastest-varying %ENUM;>
<!ATTLIST Density-coordinates_fastest-varying value (
        x |
        y |
        z
        ) #REQUIRED >


<!ELEMENT Density-coordinates_slowest-varying %ENUM;>
<!ATTLIST Density-coordinates_slowest-varying value (
        x |
        y |
        z
        ) #REQUIRED >


<!ELEMENT Density-coordinates_scale-factor (%INTEGER;)>

<!ELEMENT Density-coordinates_density (Density-coordinates_density_E*)>


<!ELEMENT Density-coordinates_density_E (%INTEGER;)>